Tributary Reservoir Regulation Activities 2003 Annual Report (August 2002 - July 2003)

Cunningham Dam and Reservoir Omaha, Nebraska

Water Control and Water Quality Section Hydrologic Engineering Branch Engineering Division Omaha District December 2003

2003 ANNUAL REPORT TRIBUTARY RESERVOIR REGULATION ACTIVITIES (AUGUST 2002 – JULY 2003) NORTHWEST DIVISION OMAHA DISTRICT

CHAPTER 1 - INTRODUCTION...... 1-1

CHAPTER 2 – RESERVOIRS IN THE OMAHA DISTRICT...... 2-1 a. Reservoirs with Flood Control Storage ...... 2-1 b. Reservoirs without Flood Control Storage ...... 2-2

CHAPTER 3 – TRIBUTARY RUNOFF AND FLOODS ...... 3-1 a. General Hydrologic Conditions ...... 3-1 i. Long-Term Trends ...... 3-1 ii. Rocky Mountain Snow Conditions...... 3-1 b. Significant Weather Events, August 2002 through July 2003 ...... 3-5 i. Late Summer 2002...... 3-5 ii. Fall 2002 ...... 3-5 iii. Winter of 2002-2003...... 3-6 iv. Spring 2003...... 3-8 v. Summer 2003...... 3-9 c. Runoff into Tributary Reservoirs ...... 3-12

CHAPTER 4 – RESERVOIR ACCOMPLISHMENTS ...... 4-1 a. Flood Damages Prevented ...... 4-1 b. Recreation Usage...... 4-6

CHAPTER 5 – RESERVOIR OPERATIONS...... 5-1 a. Previous Year Operations...... 5-2 i. Corps of Engineers Lakes...... 5-2 ii. Bureau of Reclamation Dams...... 5-2 b. Proposed Operations...... 5-3 i. Corps of Engineers ...... 5-3 (1) Colorado...... 5-3 (2) Nebraska...... 5-3 (3) North Dakota...... 5-3 (4) South Dakota ...... 5-4 ii. Bureau of Reclamation...... 5-4 (1) Canyon Ferry ...... 5-4 (2) Tiber (Lake Elwell) ...... 5-5 (3) Yellowtail...... 5-5 (4) Others ...... 5-5

i CHAPTER 6 – MAJOR REGULATION ISSUES...... 6-1 a. Water Quality...... 6-1 b. Downstream Channel Capacity ...... 6-2 c. Releases for Purposes other than Authorized Project Functions...... 6-3 d. Potential Hazardous Conditions...... 6-3 e. Dam Safety Issues...... 6-3 i. Corps of Engineers Dams...... 6-3 (1) Cherry Creek Dam...... 6-3 (2) Cold Brook Dam ...... 6-4 (3) Salt Creek Dams...... 6-4 ii. Bureau of Reclamation Dams...... 6-4 (1) Clark Canyon Dam ...... 6-4 (2) Canyon Ferry Dam ...... 6-4 (3) Tiber Dam...... 6-4 (4) Boysen Dam ...... 6-4 (5) Yellowtail Dam ...... 6-4 (6) Heart Butte Dam...... 6-5 (7) Jamestown Dam ...... 6-5 (8) Keyhole Dam ...... 6-5 (9) Pactola Dam ...... 6-5 (10) Shadehill Dam ...... 6-5 (11) Glendo Dam...... 6-5

CHAPTER 7 – WATER CONTROL MANUALS...... 7-1 a. Current Manual Status...... 7-1 b. Work Priorities ...... 7-1

CHAPTER 8 – DATA COLLECTION PROGRAM AND PROCEDURES...... 8-1 a. Water Control Data Collection ...... 8-1 i. Sources...... 8-1 ii. Storage ...... 8-1 iii. Data Collection Equipment...... 8-1 b. Cooperative Hydrologic Programs...... 8-2 c. Water Quality...... 8-2 d. Sediment...... 8-5 i. Bed and Suspended Sediment Sampling...... 8-5 ii. Sedimentation Surveys ...... 8-5

CHAPTER 9 – WATER CONTROL INITIATIVES...... 9-1 a. Water Control Initiatives...... 9-1 i. Missouri River Region Water Control Data System Master Plan...... 9-1 ii. Geographical Information System (GIS) ...... 9-1 b. Federal Energy Regulatory Commission (FERC) Applications...... 9-1 c. Personnel...... 9-1 d. Training...... 9-2

ii LIST OF TABLES

TABLE PAGE

2-1 Corps of Engineers Tributary Reservoirs, Omaha District...... 2-1

2-2 Bureau of Reclamation Tributary Reservoirs, Omaha District ...... 2-2

3-1 Mountain Snowpack Moisture as a Percent of Normal...... 3-2

3-2 Recorded and Annual Precip for Various Locations...... 3-6

3-3 Runoff Amounts and Peak Pool Levels ...... 3-12

3-4 Provisional 2003 Water Year Peak Stages and Discharges...... 3-13

4-1 Omaha District Projects Flood Damages Prevented FY 2002 - Local and Mainstem Reductions...... 4-1

4-2 Bureau of Reclamation Projects Flood Damages Prevented FY02 - Local and Mainstem Reductions...... 4-5

4-3 Flood Damages Prevented by State, Omaha District, FY 2002...... 4-6

4-4 Recreation Visitation Hours ...... 4-6

5-1 Tributary Reservoir Flood Control Operation (2002 Water Year)...... 5-1

5-2 Utilization of Exclusive Flood Control Zone Omaha District Tributary Projects...... 5-2

6-1 Water Quality Issues and Concerns ...... 6-2

7-1 Work Priorities for Updating Water Control Manuals ...... 7-1

7-2 Schedule for Revision of Water Control Manuals, FY 2003 - FY 2011...... 7-2

8-1 Cost of FY 2002 NWS and USGS Cooperative Programs ...... 8-2

8-2 Projects Sampled and Types of Sampling...... 8-4

9-1 FERC Permit Applications ...... 9-1

9-2 List of Personnel...... 9-2

9-3 Training Attended ...... 9-2

iii LIST OF FIGURES

FIGURE PAGE

1-1 Tributary Reservoir Projects...... 1-3

3-1 Fall 2001 Long-Term Palmer Drought Severity Index...... 3-3

3-2 Fall 2002 Long-Term Palmer Drought Severity Index...... 3-3

3-3 Spring 2003 Long-Term Palmer Drought Severity Index...... 3-4

3-4 Summer 2003 Long-Term Palmer Drought Severity Index...... 3-4

3-5 Late Summer & Early Fall Precipitation ...... 3-6

3-6 Late Fall and Early Winter Precipitation...... 3-8

3-7 Late Winter and Early Spring Precipitation...... 3-9

3-8 Late Spring and Early Summer Precipitation...... 3-11

APPENDICES

APPENDIX A – FALL RIVER BASIN Cold Brook Dam and Lake Cottonwood Springs Dam and Lake

APPENDIX B – GRAND RIVER BASIN Bowman-Haley Dam and Lake

APPENDIX C – JAMES RIVER BASIN Pipestem Dam and Lake

APPENDIX D – MILK RIVER BASIN Bull Hook – Scott Coulee Dams

APPENDIX E – MISSOURI RIVER BASIN Snake Creek Dam and Lake Audubon Spring Creek Dam and Lake Pocasse

APPENDIX F – PAPILLION CREEK BASIN Dam No. 11 – Glenn Cunningham Dam and Lake Dam No. 16 – Standing Bear Dam and Lake iv Dam No. 18 – Zorinsky Dam and Lake Dam No. 20 – Wehrspann Dam and Lake

APPENDIX G – RAPID CREEK BASIN Cedar Canyon Dam (Red Dale Gulch)

APPENDIX H – SALT CREEK BASIN Dam No. 2 – Olive Creek Dam and Lake Dam No. 4 – Bluestem Dam and Lake Dam No. 8 – Wagon Train Dam and Lake Dam No. 9 – Stagecoach Dam and Lake Dam No. 10 – Yankee Hill Dam and Lake Dam No. 12 – Conestoga Dam and Lake Dam No. 13 – Twin Lakes Dam and Lake Dam No. 14 – Pawnee Dam and Lake Dam No. 17 – Antelope Creek Dam and Holmes Park Lake Dam No. 18 – Branched Oak Dam and Lake

APPENDIX I – SAND CREEK BASIN Kelly Road Dam Westerly Creek Dam

APPENDIX J - SOUTH PLATTE RIVER BASIN Cherry Creek Reservoir Bear Creek Reservoir Chatfield Reservoir

APPENDIX K – BUREAU OF RECLAMATION Boysen Dam and Lake/Yellowtail Dam and Reservoir Canyon Ferry Dam and Reservoir Clark Canyon Dam and Reservoir Glendo Dam and Reservoir Heart Butte Dam and Reservoir (Lake Tschida) Jamestown Dam and Reservoir Keyhole Dam and Reservoir Pactola Dam and Reservoir Shadehill Dam and Reservoir Tiber Dam and Reservoir (Lake Elwell)

v

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vi CHAPTER 1 INTRODUCTION

The Omaha District is within the jurisdiction of the Northwestern Division, Corps of Engineers. Annually the Omaha District is requested to provide pertinent data about the operation and activities of reservoirs on tributary rivers to the Missouri River, for which they are responsible. This annual report summarizes significant tributary reservoir regulation activities and tributary flooding within the geographic boundaries of the Omaha District (Figure 1-1) for the period covered by this report. This period is 1 August 2002 through 31 July 2003 and is referred throughout the report as “the reporting period”.

Topics in this report include general information about the reservoirs, significant weather events and run-off into the reservoirs during the reporting period. Additional chapters discuss the accomplishments of the reservoirs, including the flood damages prevented and recreation uses. Operational data from the reporting period and an outlook for next year is also included. Final chapters of this report will discuss topics pertinent to tributary reservoir regulation activities such as: major regulation issues, water control manuals, data collection program and procedures, water control initiatives, federal energy regulatory commission applications, and personnel issues.

The following references were used in the development of this Annual Report:

· ER 1110-2-1400, 24 April 1970. · ER 1110-2-240, 8 October 1982. · Missouri River Division Letter, 1 October 1970, Subject: Reservoir Regulation Reports.

Included as appendices to this report are inclusive operational reports for all reservoirs within the District boundaries. The information contained in the appendices includes pertinent data sheets, operational summaries, historical as well as reporting period minimum and maximum data, and plots detailing flow and discharge data.

1-1 CHAPTER 1 INTRODUCTION

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E ƒev„2g‚iiu2hewƒ2@gFiFA Q ‚i†sƒih2t xi2PHHP CHAPTER 1 INTRODUCTION

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1-4 CHAPTER 2 RESERVOIRS IN THE OMAHA DISTRICT

The Omaha District, Corps of Engineers, civil works boundaries include 414,900 square miles that comprise the Missouri River watershed upstream of Rulo, Nebraska (Figure 1-1). The following section is divided into two parts. One part describes the reservoirs that are within this watershed with flood storage and the other part describes those reservoirs without flood storage.

a. Reservoirs with Flood Control Storage. This report presents information for 36 tributary reservoirs with allocated flood control storage, including 25 Corps of Engineers dams and 11 Bureau of Reclamation dams. The Corps of Engineers and Bureau of Reclamation dams are listed on Tables 2-1 and 2-2, respectively. The locations of the tributary reservoirs are shown in Figure 1-1, in Chapter 1, and pertinent data for the tributary reservoirs are presented in Appendices A through K of this report.

TABLE 2-1 CORPS OF ENGINEERS TRIBUTARY RESERVOIRS, OMAHA DISTRICT

Exclusive Flood Drainage Area Control Storage Name of Dam Location River Date of Closure (sq. miles) (Acre-Feet) 1. Bear Creek Denver, CO Bear Creek July 1977 236 28,715 2. Bowman-Haley Bowman, ND N. Fork Grand August 1966 446 72,717 3. Bull Hook Havre, MT Bull Hook Creek October 1955 54 6,500 4. Cedar Canyon Rapid City, SD Deadman Gulch September 1959 0.4 123 5. Chatfield Denver, CO South Platte August 1973 3,018 206,945 6. Cherry Creek Denver, CO Cherry Creek October 1948 386 110,037 7. Cold Brook Hot Springs, SD Cold Brook September 1952 70.5 6,680 8. Cottonwood Springs Hot Springs, SD Cottonwood Crk May 1969 26 7,730 9. Kelly Road Denver, CO Westerly Creek November 1953 10.8 360 10. Papillion No. 11 (Glenn Omaha, NE Knight Creek August 1974 17.8 13,899 Cunningham Dam) 11. Papillion No. 16 Omaha, NE Big Papio Creek October 1972 6 3,591 (Standing Bear Dam) 12. Papillion No. 18 Omaha, NE Boxelder Creek July 1984 16.4 7,649 (Zorinsky Dam) 13. Papillion No. 20 Omaha, NE S. Br. Papio September 1982 13.1 6,119 (Wehrspan Dam) Creek 14. Pipestem Jamestown, ND Pipestem Creek July 1973 594 133,163 15. Salt Creek No. 2 (Olive Lincoln, NE S. Olive Branch September 1963 8.2 3,857 Creek Dam) 16. Salt Creek No. 4 Lincoln, NE N. Olive Branch September 1962 16.6 7,129 (Bluestem Dam) 17. Salt Creek No. 8 Lincoln, NE N. Hickman September 1962 15.6 6,676 (Wagon Train Dam) Branch 18. Salt Creek No. 9 Lincoln, NE S. Hickman August 1963 9.7 4,413 (Stagecoach Dam) Branch 19. Salt Creek No. 10 Lincoln, NE Cardwell Branch October 1965 8.4 5,841 (Yankee Hill Dam) 20. Salt Creek No. 12 Lincoln, NE Holmes Creek September 1963 15.1 7,655 (Conestoga Dam)

2-1 CHAPTER 2 RESERVOIRS IN THE OMAHA DISTRICT

TABLE 2-1 CORPS OF ENGINEERS TRIBUTARY RESERVOIRS, OMAHA DISTRICT

Exclusive Flood Drainage Area Control Storage Name of Dam Location River Date of Closure (sq. miles) (Acre-Feet) 21. Salt Creek No. 13 Lincoln, NE Middle Creek September 1965 11.0 5,021 (Twin Lakes Dam) 22. Salt Creek No. 14 Lincoln, NE N. Middle Creek July 1964 35.9 20,299 (Pawnee Dam) 23. Salt Creek No. 17 Lincoln, NE Antelope Creek September 1962 5.4 5,845 (Antelope Creek Dam) 24. Salt Creek No. 18 Lincoln, NE Oak Creek August 1967 88.7 71,686 (Branched Oak Dam) 25. Westerly Creek Denver, CO Westerly Creek July 1991 9.3 4,150 26. Spring Creek Dam Pollock, SD Spring Creek 1961 660 0 (Lake Pocasse) 27. Snake Creek Dam Riverdale, ND Snake Creek 1952 250 0 (Lake Audubon)

TABLE 2-2 BUREAU OF RECLAMATION TRIBUTARY RESERVOIRS, OMAHA DISTRICT

Exclusive Flood Drainage Area Control Storage Name of Dam Location River Date of Closure (sq. miles) (Acre-Feet) 1. Boysen Thermopolis, WY Wind October 1951 7,710 150,632 2. Canyon Ferry Helena, MT Missouri March 1953 15,900 99,460 3. Clark Canyon Dillion, MT Beaverhead August 1964 2,320 79,090 4. Glendo Glendo, WY North Platte June 1956 14,330 271,900 5. Heart Butte Glen Ullin, ND Heart August 1949 1,710 147,900 6. Jamestown Jamestown, ND James May 1953 1,300 185,400 7. Keyhole Morcroft, WY Belle Fourche March 1952 1,950 140,500 8. Pactola Rapid City, SD Rapid Creek August 1956 319 43,057 9. Shadehill Shadehill, SD Grand July 1950 3,120 218,300 10. Tiber Chester, MT Marias October 1950 4,850 400,900 11. Yellowtail Hardin, MT Bighorn December 1966 19,626 258,330

b. Reservoirs without Flood Control Storage. Two Corps of Engineers tributary reservoirs without allocated flood control storage are included in this report. Both are subimpoundments of the Missouri River Main Stem Projects and were formed by the construction of relocations for transportation facilities and utilities. Lake Audubon, a subimpoundment of Lake Sakakawea, is located just northeast of Riverdale, North Dakota. Lake Pocasse, a subimpoundment of Lake Oahe, is located near Pollock, South Dakota. Both lakes are used for fish, wildlife and recreational purposes. The two reservoirs are listed on Table 2-1. Their locations are shown on Figure 1-1 and pertinent data are presented in Appendix E.

2-2 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

The following chapter gives a description of weather related events that occurred in the District during the reporting period. It is useful to understand previous weather events, since they affect the activities of the Water Control personnel and how they regulate the tributary reservoirs.

a. General Hydrologic Conditions

i. Long-Term Trends. Since Fall 1999, below average precipitation began contributing to increasing drought conditions in the Omaha District. By Fall 2001, much of the District was encompassed by abnormally dry conditions, which included a large area of Extreme Drought in northwest Wyoming and central Montana as shown in Figure 3-1. Continued precipitation deficits during the 2002 water year allowed some form of drought condition to expand to the remainder of the District, and extreme drought conditions shifted southeastward into Wyoming, Colorado, western South Dakota and western Nebraska by Fall 2002 (Figure 3-2). Decent late-winter snowfall in the Northern Rockies, the Yellowstone River Basin headwaters, and the upper South Platte River basin provided some improvement to drought conditions in the western regions of the District. However, the El Nino winter (warm and generally dry) on the plains allowed the drought to expand into eastern South Dakota and the James River Basin in North Dakota (Figure 3-3). Spring rainfall nearly erased drought in eastern South Dakota and eastern North Dakota by July 22 (Figure 3-4), but several heat waves and continued dryness throughout the District intensified drought in western Wyoming and Montana.

ii. Rocky Mountain Snow Conditions. The West underwent a rapid transition to winter conditions at the start of November 2002 as a series of Pacific fronts moved rapidly through the West bringing significant snowfall to the central Rockies. By November 12, SNOTEL snow gages were indicating that the Upper North Platte River Basin and South Platte River Basin contained well-above normal snow water equivalent snow packs (Table 3-1). Late November/early December is generally a major snow accumulation period in the Rocky Mountains, yet this was not the case in 2002. El Nino weather patterns, which are characteristically dry and warm, were prevalent in December. A high-pressure ridge dominating most of the western U.S. prevented any significant precipitation from falling in the mountains and plains. Warm air associated with the trough reduced the already patchy plains snow pack. Consequently, snow water equivalents declined sharply in the Platte River Basins in December.

By the beginning of winter, Pacific storms brought much needed snowfall to the intermountain regions, the northern Rockies in Montana, and the central Rockies in Wyoming, Colorado, and the northern plains of North Dakota. The snowfall temporarily increased snow pack in these areas; however, with only moderate snowfall, average basin snow packs began to fall behind again. Colder temperatures maintained a snowpack of 0.20 inches of water in the James River basin in North Dakota, but elsewhere in plains regions it was nonexistent. By January 6, mountain snow pack in the upper Yellowstone and South Platte River basins fell even further.

3-1 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

TABLE 3-1 MOUNTAIN SNOWPACK MOISTURE AS A PERCENT OF NORMAL Missouri Basin Upper Yellowstone Upper North Platte South Platte River Date Headwaters River Basin River Basin Basin 12-Nov-02 69 88 107 132 02-Dec-02 62 77 80 98 06-Jan-03 65 69 80 76 03-Feb-03 80 90 78 66 03-Mar-03 85 93 88 82 07-Apr-03 95 105 100 108 05-May-03 110 106 98 113 09-Jun-03 65 83 76 47

Following this period, warm temperatures moved back into the central Rockies on a high-pressure ridge causing a reduction in mountain snow pack at all locations in the District. The daily high temperature at Telluride, CO, on January 13, reached 60oF at elevation 9,000 ft. Warm temperatures in the plains melted almost all of the remaining snow pack. During the final weeks of January, low pressure that moved in off the west coast brought heavy snowfall to Montana and Wyoming increasing snow packs significantly in the Missouri Basin headwaters and the Upper Yellowstone River basin. Over the month of February, the overall outcome was an increase in snow pack from February 3 to March 3 due to several large winter storms. These storms were large enough to drop significant snow on the order of 0.2-0.4 in. of equivalent snow-water on the northern plains of Montana and Wyoming.

The largest snowfall event in many years occurred in Colorado and Wyoming from March 17-19. The South Platte River basin snow pack increased almost 30% in this single storm while adjacent basins also benefited from the storm. Plains snow pack in the South Platte basin contained 1.0-2.0 in. of water, while plains snow pack in Wyoming after this storm contained 0.4-1.0 in. of water. Warm temperatures during the week that followed the storm melted the remaining plains snow. Snow packs as of April 7 were above normal in all major river basins except for the Missouri Basin headwaters.

Spring weather conditions remained cool slowing snowmelt, and by May 5, all but the Upper North Platte River basin showed greater than average snow pack. After May 5, high pressure started to build in the West signaling the start of rapid snowmelt. At the onset of the warmer temperatures, mountain snow declined rapidly, and by June 9, 2003, most SNOTEL stations had melted out, many about 15 days before normal meltout dates.

Another useful indicator of snow precipitation is accumulated precipitation as a percent of average. As of June 9, 2003, accumulated precipitation for Water Year 2003 was 104% and 105% for the South Platte River Basin and Upper North Platte River Basin, respectively. These accumulations indicate that the late winter surge in snow pack in the central Rockies brought the Platte River Basins within a normal year of peak snow pack and precipitation. On the other hand, the Missouri Basin and Upper Yellowstone Basin reported 87% and 94% of normal precipitation as of June 9, 2003.

3-2 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

FIGURE 3-1 FALL 2001 LONG-TERM PALMER DROUGHT SEVERITY INDEX

FIGURE 3-2 FALL 2002 LONG-TERM PALMER DROUGHT SEVERITY INDEX

3-3 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

FIGURE 3-3 SPRING 2003 LONG-TERM PALMER DROUGHT SEVERITY INDEX

FIGURE 3-4 SUMMER 2003 LONG-TERM PALMER DROUGHT SEVERITY INDEX

3-4 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

b. Significant Weather Events, August 2002 through July 2003

i. Late Summer 2002. Nationally, this was the 3rd hottest summer (June- Aug) in over 100 years of record exceeded only by the summers of 1943 and 1936. Combined with the severe drought conditions throughout much of the District, this prohibited improvement to water supplies and moisture conditions in the West. Record high temperatures were reached in the Plains region of the District near the end of July while cold air moved into Montana and Wyoming bringing record low temperatures. With this intrusion of cold air, heavy rain fell in Montana (4.03 in. at Wolf Point) and Colorado in the first week of August, and moderate rains blanketed South Dakota and Nebraska, eventually becoming heavy (2 – 4 in.) in eastern Nebraska and western Iowa. Again by mid-August the central Plains were reporting triple-digit record high temperatures in many locations. These dry and warm conditions fueled 3-dozen wildfires in western SD and the western states. Finally near the end of summer a heat wave once again invaded the northern Plains setting record high temperatures at many locations in the District. Due to the dryness and repeated heat waves, drought continued in much of the District west of the Missouri River as seen in Figure 3-2.

ii. Fall 2002. Widespread showers in September occurred over much of the District with the heaviest rainfall in the southeast quarter of the District easing long-term drought effects. Temperatures were generally below normal, especially in the northern plains; however, another heat wave hit the central plains, and was followed by a sharp cooldown. Denver, CO, reported its 14th consecutive month with drier than normal conditions, having received 9.34 in. of precipitation in the previous 12 months (approximately 50% of average).

In October dry conditions continued throughout the District, but cooler weather prevailed, lowering weekly average temperatures in the northern Plains by 10-13oF. During the last week of October, another cold front penetrated the District bringing the first significant snow to the High Plains and 12-15oF below normal temperatures. During this period 250 daily record lows were established in the northern Plains, Northwest, and the Great Basin. October 30 and 31 temperatures fell to –9 oF in Great Falls, MT, and –9oF in Williston, ND. This was the coldest October on record in Kearney, NE, Sheridan, WY, and Miles City, MT. Despite the cool weather, the District experienced another dry month. Denver reported their 15th consecutive month with below-normal precipitation.

In November a warm subtropical ridge prevailed in the District offering little precipitation and 2–6oF above normal temperatures. Much of the northern Plains received 25% of normal precipitation while the southeast corner of the District received 75% to greater than 100% of normal. The Yellowstone River headwaters received 100- 150% of normal precipitation during this period. The overall Fall precipitation accumulation is shown as percent of normal precipitation in Figure 3-5. Table 3-2 lists some low precipitation accumulations received at various locations throughout the District during the 2002 calendar year.

3-5 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

FIGURE 3-5 Fall 2002 Percent of Normal Precipitation

Table 3-2 2002 Recorded Precipitation and Average Annual Precipitation for various locations in the Omaha District Precipitation (inches) Location 2002 Recorded Average Annual Laramie, WY 5.78 11.37 Alliance, NE 6.70 15.93 Denver, CO 7.48 15.81 Chadron, NE 7.78 16.63 Winner, SD 11.82 23.72

iii. Winter 2002 – 2003. The winter afforded some recovery from drought conditions in the West, yet it perpetuated dryness in northern and eastern regions of the District. The winter precipitation accumulation is shown below in Figure 3-6.

El Nino-driven weather resulted in warmer-than-normal temperatures and drier- than-normal precipitation accumulations in the month of December. Temperatures for the month were as much as 10oF above normal throughout the District. Eastern locations in the District reached streaks of 50 consecutive days without precipitation.

3-6 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

The greatest monthly precipitation totals were recorded in mountain regions of Montana and Wyoming (0.5–1.5 in.) including 4.0 in. of equivalent snow water in the Yellowstone Park area. Despite the precipitation, much of the District received only 25-50% of normal December accumulations.

El Nino impacted the District less in January, yet it was still the second driest January on record for the continental United States. January temperatures in the District ranged from 4-12oF above normal for the West and High Plains accompanied by very dry conditions in the plains and foothills regions. Denver received only a trace of snowfall in January. Average January temperatures in Rawlins, WY, were 30.4oF or 7.4oF above normal. Laramie, WY, recorded a daily average temperature of 30.1oF or 9.7oF above normal.

In February, the District received varying but not widespread amounts of precipitation. Only shallow snow cover persisted throughout the northern Plains. Some of the coldest average daily temperatures in the U.S. occurred in February. Near the end of February, Montana and Wyoming reached some of their lowest temperatures in 4 to 6 years such as -20oF in Sheridan, WY, and -17oF Billings MT. The average monthly temperature in Williston, ND, was only 7.3oF. Areas that netted 100-150% of normal February precipitation included the mountainous regions of the District, and eastern Nebraska and South Dakota, while snowfall was sparse in the remainder of the District.

Precipitation during March was largely above normal (100-200%) in the western third of the Dakotas and Nebraska westward. Much of the season’s precipitation came from a single storm system that dropped heavy snow in Colorado and Wyoming. The large storm occurred March 17 – 19 and set near record precipitation totals for March. Denver received 31.8 inches of snow (2.80 inches of water) during that single storm. The Front Range from central Colorado north to Cheyenne, WY, received 3.0 to 4.0 inches of equivalent snow water. At foothill and mountain elevations, snow-water equivalents ranged from 5.0 and 7.0 inches. Williston, ND, recorded 1.84 inches of equivalent snow water, which was 249% of normal for March. This snowstorm caused a dramatic increase in mountain snow packs in the Central Rockies increasing most basin snow packs to above normal snow water equivalents for the winter season. Overall, the mountains benefited greatly from February and March snow, while the eastern High Plains received 50-75% of normal precipitation.

3-7 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

FIGURE 3-6 Winter 2003 Percent of Normal Precipitation

iv. Spring 2003. Following the March snowstorm, the District went into a warm period with Plains temperatures reaching 6oF above normal and some reaching as high as 12oF above normal near Sioux Falls, SD. These temperatures melted much of the spotty plains and foothills snowpack; but, since soil moisture reserves in Colorado and eastern Wyoming were extremely low, reservoirs such as the Tri-Lakes projects in Denver had limited gain in water storage because runoff volumes were low relative to the volume of water stored in the snowpack.

The District experienced 3-6oF above normal temperatures throughout the month of April with periods of cool and snowy weather intermixed. Following the major March snowstorm, record daily high temperatures were set in Omaha, NE, at 90 and 87oF. After this warmup, another storm system moved across the southeast corner of the District leaving up to 9 in. of snow in its path. Once again by April 12, warm weather crept in setting record high temperatures in Rapid City, SD (86oF), Chadron, NE (85oF), Miles City, MT (83oF), Bismarck, ND (92oF), and Mobridge, SD (93oF). Daily record high temperatures in northern locations aided in the premature breakup of river ice on the Missouri and Yellowstone Rivers, and their tributaries. To end April, a trough of low pressure brought a storm system to the District that dropped 1-2 in. of rain along a path from southwest Montana to eastern Nebraska. The storms posed a slight risk of flash flooding, but drought conditions minimized the impact.

3-8 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

May brought about another month of extreme temperatures and varied rainfall. For the most part, May was cooler than normal with the exception of warmer temperatures in Wyoming and Colorado. Eastern Montana, North Dakota, and northern South Dakota received a series of snow and rain showers that brought up to 4 in. of precipitation to North Dakota and eastern Nebraska. Early June precipitation for the District was below normal in the western Dakotas and western Montana.

Overall the District received average spring precipitation with greater than 150% of average precipitation in the South Platte Basin and the James River Basin. Western South Dakota and eastern Wyoming received 75-100% of normal precipitation during the three-month period as shown in Figure 3-7.

FIGURE 3-7 Spring 2003 Percent of Normal Precipitation

v. Summer 2003. The summer was generally hot and dry with the exception of a few areas that received above normal precipitation. These areas included central Colorado, southwest North Dakota, a small area of central Wyoming, southeast South Dakota, and northeast Nebraska. Figure 3-8 depicts the three-month precipitation accumulations as a percent of normal precipitation.

Colorado benefited from early summer precipitation, while Wyoming was hit by a slow-moving storm system that dropped 18 in. of snow east of Yellowstone National Park. In the High Plains, an outbreak of severe thunderstorms from June 20-25

3-9 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

caused localized flooding just on the southern boundary of the District with damaging tornadoes and record size hail. Casper, WY, recorded its wettest June of record (4.71 in. or 329% of normal) because of this storm.

Following this activity the summer dried out substantially and warmed up. A highly amplified ridge of tropical high pressure enveloped the U.S. from the Missouri River west, while an upper level trough of low pressure encompassed the eastern U.S. Precipitation was extremely sparse across the District receiving between 0.5 and 2.0 inches of rainfall in July. Montana, Wyoming, and south central Nebraska received 25 to 50% of normal precipitation for the month. Also in July central Colorado, North Dakota, and South Dakota received approximately 75% of normal precipitation. Only the Sioux City/Mitchell, SD, and surrounding areas received abundant rainfall in July from several thunderstorm systems that moved through the area. July was the driest month on record in several Plains locations. For example, Grand Island, NE, received only 0.22 in. of rain (7% of normal), and Billings, MT, received only a trace of rain. This was also the hottest month on record for more than a dozen western states. Average daily temperatures were 4.6 to 7.4oF higher than normal averages in Riverton, Cheyenne, and Laramie, WY. Average daily temperatures ranged from normal at the eastern boundary to 4-6oF above normal in the mountainous regions.

Hot and dry weather continued into August with most locations on the Plains receiving a mere 25-75% of normal precipitation. Pierre, SD, received only 0.18 inches (10% of normal) rainfall, and Billings, MT, went 62 consecutive days without measurable rainfall. In many locations in the District, triple-digit temperatures were reached on consecutive days. Later in August, monsoonal moisture flow brought beneficial rainfall to central Colorado and central Wyoming. In September an upper level trough established itself in the District, and on September 9 and 10, a low-pressure system moving across the District served thunderstorms to the Central Plains on consecutive nights. During the first day of the storms most of the rain fell in Wyoming, western Colorado, western Nebraska, and the western Dakotas. During the second day, the ensuing cold front spawned severe thunderstorms with heavy rainfall (3-4 in. totals) in eastern Nebraska and eastern South Dakota. This rainfall event was enough to supply these areas with 100-200% of normal rainfall for the month of September.

3-10 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

FIGURE 3-8 Summer 2003 Percent of Normal Precipitation

3-11 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

c. Runoff into Tributary Reservoirs

Table 3-3 lists runoff and peak pool statistics for the tributary reservoir projects during the report period. Table 3-4 lists peak discharges at selected gaging stations including many reservoir release control points used by the Omaha District.

TABLE 3-3 RUNOFF AMOUNTS AND PEAK POOL LEVELS FOR REPORT YEAR (AUG 01 - JUL 31)

RECORD ANNUAL 2003 2003 ANNUAL (1) AVERAGE RUNOFF % 2003 RECORD PEAK INFLOW INFLOW INFLOW ACRE- OF PEAK POOL (CAL NAME OF DAM ACRE-FEET (ACRE-FEET) FEET NORMAL POOL YEAR) CORPS OF ENGINEERS Bowman-Haley Dam 3,529 58,000 (72) 22,010 16 2751.4 2762.7 (78) Bear Creek Dam 21,275 91,900 (83) 36,458 58 5561.2 5587.1 (95) Chatfield Dam 59,525 450,000 (83) 156,150 38 5433.4 5447.6 (80) Cherry Creek Dam 14,253 30,900 (84) 9,874 144 5552.4 5565.8 (73) Cold Brook Dam 716 1,410 (99) 690 104 3584.2 3585.6 (99) Cottonwood Dam 18 300 (99) 38 47 3864.6 3872.7 (00) Kelly Road Dam n/a n/a n/a n/a n/a n/a Papio Dam 11 4,592 18,700 (80) 7,416 62 1122.0 1125.3 (99) Papio Dam 16 1,597 3,490 (98) 1,202 133 1105.2 1107.8 (84) Papio Dam 18 2,616 11,000 (93) 4,444 59 1111.6 1116.8 (93) Papio Dam 20 952 9,710 (93) 2,148 44 1094.6 1103.2 (93) Pipestem Dam 16,536 148,000 (97) 46,599 35 1449.5 1487.0 (97) Salt Creek Dam 2 444 12,500 (87) 2,424 18 1330.5 1342.6 (93) Salt Creek Dam 4 5,536 15,500 (93) 4,873 114 1309.7 1316.5 (73) Salt Creek Dam 8 2,225 14.000 (01) 5,088 44 1289.3 1295.4 (73) Salt Creek Dam 9 2,386 10,400 (87) 3,219 74 1273.6 1279.0 (73) Salt Creek Dam 10 1,214 20,400 (99) 5,526 22 1238.0 1252.3 (73) Salt Creek Dam 12 1,353 25,000 (84) 5,223 26 1233.8 1241.1 (87) Salt Creek Dam 13 2,815 13,300 (93) 4,009 70 1342.6 1346.9 (83) Salt Creek Dam 14 3,618 23,300 (87) 7,701 47 1244.9 1249.1 (79) Salt Creek Dam 17 3,888 11,100 (93) 3,460 112 1244.3 1250.0 (93) Salt Creek Dam 18 4,717 74,400 (83) 27,393 17 1280.1 1287.9 (87) Spring Creek Dam (Lake n/a n/a n/a n/a n/a 1625.0 (87) Pocasse) Snake Creek Dam (Lake n/a n/a n/a n/a n/a 1848.6 (76) Audubon) Westerly Creek Dam n/a n/a n/a n/a n/a n/a BUREAU OF RECLAMATION Boysen Dam 540,829 1,677,000 (67) 1,019,952 53 4704.5 4730.8 (67) Canyon Ferry Dam 2,696,724 5,786,000 (97) 3,822,122 71 3797.7 3800.0 (62) Clark Canyon Dam 106,553 718,000 (84) 275,503 39 5522.2 5564.7 (84) Glendo Dam 753,953 2,230,000 (84) 1,189,859 64 4631.1 4650.9 (73) Heart Butte Dam 65,616 307,000 (82) 87,479 75 2070.3 2086.2 (52) Jamestown Dam 22,665 211,300 (97) 42,617 53 1432.5 1445.7 (97) Keyhole Dam 12,760 100,000 (78) 19,911 64 4092.3 4100.4 (78) Pactola Dam 29,082 104,300 (99) 36,928 79 4580.7 4585.9 (65) Shadehill Dam 8,640 284,400 (97) 70,679 12 2664.6 2297.9 (52) Tiber Dam 441,395 1,150,000 (75) 614,553 72 2991.8 3005.6 (65) Yellowtail Dam 1,184,663 3,516,000 (97) 2,431,336 49 3616.0 3656.4 (67) (1) Water Year Oct 1 – Sep 30 (2) Bureau of Reclamation statistics based on BOR data. Inflow values do not include evaporation estimations.

3-12 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

TABLE 3-4 PROVISIONAL 2003 WATER YEAR PEAK STAGES AND DISCHARGES Maximum 2003 Maximum Known Drnge Comments Stream/ Area Record Flood Dschrg Alternate Dschrg Station (SqMi) Since Stage Date Stage (cfs) Date Date Stage (cfs) Red Rock River 570 1911 1.1 May 31 3.57 672 15 May 5.40 2,500 below Lima Res, 2003 1993 MT Beaverhead River 3,619 1935 5.2 Mar 15 4.95 465 12 May nr 3,130 nr Twin Bridges, 2003 1944 MT Jefferson River nr 9,532 1978 na Jun 2 7.72 11,500 09 Jun 9.00 17,000 Three Forks, MT 2003 1995 Madison River nr 2,186 1901 4.4 May 30 5.71 6,710 12 Jun 8.01 9,550 McAllister, MT 2003 1970 Gallatin River @ 1,795 1893 7.5 May 30 8.24 5,830 21 Jun nr 9,840 Logan, MT 2003 1899 Missouri River @ 14,669 1890 10 Jun 2 9.63 20,200 12 Jun 12.22 33,300 Toston, MT 2003 1997 Missouri River nr 20,941 1957 13 Jun 5 7.86 11,100 01 Jun 17.00 35,000 Ulm, MT 2003 1953 Sun River nr 1,854 1897 10 May 27 4.21 3,660 09 Jun 23.40 53,500 Vaughn, MT 2003 1964 Missouri River @ 34,379 1935 17 May 31 6.28 15,200 11.63 Mar 05 Jun 23.40 122,000 Virgelle, MT 2003 15 2003 1953 Missouri River nr 40,987 1934 na Jun 2 18.38 15,600 22.54 Mar 06 Jun nr 137,000 Landusky, MT 2003 17 2003 1953 Milk River @ 5,785 1899 10 May 31 4.75 1,170 12 Apr nr 20,000 Harvre, MT 2003 1899 Milk River nr 17,670 1977 20 Mar 21 13.18 5,260 03 Apr 24.20 12,400 Saco, MT 2003 1979 Milk River @ 22,332 1939 20 Mar 21 17.49 7,860 18 Apr 31.38 45,300 Nashua, MT 2003 1952 Missouri River nr 82,290 1928 10.9 May 23 4.57 11,700 9.00 Jun 29 25 Mar 14.40 66,800 Wolf Point, MT 2003 2003 1939 Missouri River nr 91,557 1941 19 May 14 6.32 12,000 10.37 Dec 26 Mar 15.12 78,200 Cultbertson, MT 2003 30 2003 1943 Musselshell River 4,023 1946 5.1 Jun 12 2.91 594 3.76 Mar 16 18 Jun 12.45 9,610 nr Roundup, MT 2003 2003 Ice 1967 Yellowstone River 11,795 1904 13 Jun 2 12.04 48,200 12 Jun 15.00 82,000 @ Billings, MT 2003 1997 Wind River @ 2,309 1906 8 Jun 1 8.00 4,360 8.08 Feb 15 15 Jun 10.15 13,300 Riverton, WY 2003 2003 Ice 1935 Wind River below 7,701 1951 na na na na na 07 Jul 13.35 13,500 Boysen Res, WY 1967 Bighorn River @ 15,765 1928 8 May 3 4.51 5,920 16 Jun 11.10 25,200 Kane, WY 2003 1935 Bighorn River nr 22,414 1981 17 May 30 5.58 4,110 6.94 Dec 11 20 May nr 59,200 Basin, WY 2003 2002 Ice 1978 Yellowstone River 48,253 1922 13 Jun 4 10.63 51,900 11.45 Mar 6 22 May 16.50 102,000 @ Miles City, MT 2003 2003 Ice 1978 Tongue River @ 5,379 1938 5.8 Mar 15 10.00 7,000 15 Jun 11.33 13.300 Miles City, MT 2003 1962 Powder River nr 13,194 1938 8.4 Mar 18 4.85 3,220 19 Feb 11.23 31,000 Locate, MT 2003 1943 Yellowstone River 69,103 1910 19 Jun 5 13.53 49,100 21 Jun nr 159,000 nr Sidney, MT 2003 1921 Knife River @ 2,240 1928 12 Mar 18 15.02 3,850 24 Jun 27.01 35,300 Hazen, ND 2003 1966 Missouri River @ 186,40 1927 16 Aug 31 7.66 24,800 10.87 Jan 06 Apr 27.90 500,000 Bismarck, ND 0 2002 21 2003 Ice 1952 Heart River nr 3,310 1924 17 Mar 24 6.23 2,600 19 Apr 23.64 30,500 Mandan, ND 2003 1950 Cannonball River 4,100 1934 10 Mar 24 5.75 971 19 Apr 22.30 94,800 @ Breien, ND 2003 1950

3-13 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

Maximum 2003 Maximum Known Drnge Comments Stream/ Area Record Flood Dschrg Alternate Dschrg Station (SqMi) Since Stage Date Stage (cfs) Date Date Stage (cfs) N Fork Grand 509 1908 17 n/a Discont'd 07 Apr 17.03 14,100 River @ Haley, 1952 ND Grand River @ 5,370 1958 15 Mar 18 9.70 680 Affected by 23 Mar 19.16 31,000 Little Eagle, SD 2003 Ice 1987 Moreau River nr 4,880 1954 21 May 4 14.02 7,530 23 Mar 27.01 30,000 Whitehorse , SD 2003 1997 Belle Fourche 3,280 1946 14 Mar 16 8.94 925 18 Jun 15.59 4,400 River @ WY-SD 2003 1962 State Line Fall River @ Hot 137 1937 13 Jun 17 3.31 186 04 Sept 18.40 13,100 Springs, SD 2003 1938 Rapid Creek @ 410 1942 7 Sep 9, 4.15 145 09 Jun 19.66 50,000 Rapid City, SD 2002 1972 Cheyenne River 23,900 1960 14 Sep 10 12.55 4,930 13.39 Mar 4 22 May 15.77 55,900 nr Plainview, SD 2002 2003 1982 Cheyenne River 12,800 1934 n/a Sep 9 6.54 6,770 01 May 16.25 26,900 nr Wasta, SD 2002 1957 Bad River nr Ft. 3,107 1928 21 May 9 13.17 5,460 01 Jul 32.90 70,000 Pierre, SD 2003 1905 Niobrara River nr 12,600 1958 12 Sep 13 3.74 910 5.54 Jan 31 27 Mar 10.10 39,000 Verdel, NE 2002 2003 1960 Vermillion River nr 2,302 1983 21 Jul 9 14.08 2,340 23 Jun 31.77 21,400 Vermillion, SD 2003 1984 Pipestem Creek 700 1973 10 Mar 26 6.72 227 20 Apr 11.60 2,520 nr Pingree, ND 2003 1979 James River nr 1,060 1968 12 Jun 30 8.60 920 28 Jul 13.82 3,786 Grace City, ND 2003 1993 James River @ 2,820 1928 12 May 23 5.68 322 13 May 15.82 6,390 Jamestown, ND 2003 1950 James River @ 4,390 1957 14 May 21 8.38 498 14 Apr 16.17 6,800 Lamoure, ND 2003 1969 James River @ 7,393 1988 11 Jun 28 10.45 581 18 Apr 19.02 5,000 Columbia, SD 2003 1997 James River @ 9,742 1945 13 Jul 9 8.53 680 08 Apr 25.85 8,330 Ashton, SD 2003 1997 James River nr 20,653 1928 13 Jul 8 8.53 1,640 23 Jun 20.45 29,400 Scotland, SD 2003 1984 Big Sioux River nr 1,007 1972 6.8 Mar 17 8.27 250 06 Apr 12.05 7,680 Watertown, SD 2003 1997 Big Sioux River nr 4,483 1948 12 Mar 20 7.19 1,430 09 Apr 16.47 41,300 Dell Rapids, SD 2003 1969 Skunk Creek @ 622 1948 na Jul 9 11.02 n/a Gage 17 Jun nr 29,400 Sioux Falls, SD 2003 moved due 1957 to const. Big Sioux River @ 5,216 1962 16 Aug 21 12.01 2,910 10 Apr 27.45 40,700 Sioux Falls, SD 2002 1969 Rock River nr 1,592 1948 16 Aug 24 6.06 1,250 6.24 May 07 Apr 17.32 40,400 Rock Valley, IA 2002 13 2003 1969 Big Sioux River 8,424 1928 16 Aug 23 11.27 3,390 09 Apr 22.99 80,800 @ Akron, IA 2002 1969 Missouri River @ 314,60 1897 36 Aug 22 16.55 36,100 14 Apr 24.28 441,000 Sioux City, IA 0 2002 1952 Perry Creek @ 65 1945 15.5 Jun 25 12.47 1,240 19 May 28.54 8,670 Sioux City, IA 2003 1990 Floyd River @ 268 1955 12 Jul 9 11.86 1,520 20 Jun 18.54 16,300 Alton, IA 2003 1983 Floyd River @ 886 1934 26 Jul 10 15.14 2,940 08 Jun 25.30 71,500 James, IA 2003 1953 Missouri River @ 316,20 1987 23.2 Jun 10 23.42 37,300 23.25 Aug 16 Jul 32.04 75,400 Decatur, NE 0 2003 23 2002 1993 Little Sioux River 1,548 1927 20 Jun 28 18.30 3,290 02 Jul 20.69 17,400 @ Linn Grove, IA 2003 1993

3-14 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

Maximum 2003 Maximum Known Drnge Comments Stream/ Area Record Flood Dschrg Alternate Dschrg Station (SqMi) Since Stage Date Stage (cfs) Date Date Stage (cfs) Little Sioux River 2,500 1918 19 Jun 24 15.51 8,320 07 Apr 25.86 29,800 @ Correctionville, 2003 1965 IA West Fork Ditch 403 1939 20 Jun 24 17.02 2,710 28 Mar 22.46 12,400 @ Hornick, IA 2003 1962 Little Sioux River 3,526 1958 20 Jul 10 21.60 16,200 21 Jun 26.54 31,200 nr Turin, IA 2003 1983 Maple River @ 669 1941 16 Jul 10 15.32 7,520 12 Sep 16.74 20,800 Mapleton, IA 2003 1978 Soldier River @ 407 1940 28 Jul 6 11.28 3,990 12 Jun 28.17 22,500 Pisgah, IA 2003 1950 Boyer River @ 871 1918 19 Jul 9 11.12 5,330 14.71 Feb 17 Jun 22.54 30,800 Logan, IA 2003 21 2003 1990 BW Ice Jam Missouri River @ 322,80 1928 29 Jul 11 22.07 58,400 18 Apr 40.20 396,000 Omaha, NE 0 2003 1952 Missouri River @ 410,00 1929 18 May 6 14.03 65,900 14.33 Aug 19 Apr 27.66 414,000 Nebraska City, 0 2003 23 2002 1952 NE West Nishnabotna 609 1959 14 May 4 11.92 6,960 02 Apr 24.76 29,300 River @ Hancock, 2003 1993 IA West Nishnabotna 1,326 1948 19 May 5 15.00 5,500 26 May 24.50 40,800 River @ 2003 1987 Randolph, IA East Nishnabotna 436 1960 17 May 5, 9.49 4,890 12 Sep 22.81 26,700 River nr Atlantic, 2003 1972 IA East Nishnabotna 894 1918 18 May 5 12.50 4,880 15 Jun 29.39 60,500 River @ Red Oak, 2003 1998 IA Nishnabotna 2,806 1922 36 May 6 19.40 7,140 17 Jun 33.18 65,100 River above 2003 1998 Hamburg, IA Missouri River @ 414,90 1949 17 Jun 13 16.57 77,700 22 Apr 25.60 358,000 Rulo, NE 0 2003 1952 North Platte River 4,175 1939 19 Jun 2 8.22 8610 11 Jun 11.30 16,200 nr Sinclair, WY 2003 1986 North Platte River 13,538 1959 4.5 Jul 24 3.08 2,855 14 May 7.10 16,000 nr Glenrock, WY 2003 1965 North Platte River 16,425 1909 4.5 Jul 18 7.02 2,200 26 Jun 9.85 22,000 below Walen Res, 2003 1955 WY Laramie River nr 4,564 1915 na May 3 2.77 133 2.81 Feb 10 May 9.40 6,260 Ft. Laramie, WY 2003 2003 1973 North Platte River 22,218 1929 4.5 Jul 19 3.91 2,820 02 Jun nr 17,900 @ WY-NE State 2003 1929 Line North Platte River 25,300 1905 8 Nov 5 3.93 882 26 Jun 5.39 24,900 @ Bridgeport, NE 2002 1899 North Platte River 28,600 1937 7 Mar 19 5.69 1,080 8.04 Dec 25 04 Jun nr 13,500 @ Lewellen, NE 2003 2002 1971 North Platte River 30,900 1895 7 Aug 1 5.79 2,590 11 Jun nr 29,600 @ North Platte, 2002 1909 NE South Platte River 880 1933 na Jul 18 1.74 230 27 Apr 7.60 3,970 nr Hartsel, CO 2003 1970 South Platte River 2,621 1928 6 Jun 2 1.86 597 23 Apr 5.68 5,700 @ Waterton, CO 2003 1942 N. Fk South Platte 127 1908 na May 31 1.69 490 07 Jun nr 990 River @ Grant, 2003 1912 CO

3-15 CHAPTER 3 TRIBUTARY AND RUNOFF CONDITIONS

Maximum 2003 Maximum Known Drnge Comments Stream/ Area Record Flood Dschrg Alternate Dschrg Station (SqMi) Since Stage Date Stage (cfs) Date Date Stage (cfs) Bear Creek @ 260 1914 8 Apr 19 3.98 338 07 May 10.50 8,150 Sheridan, CO 2003 1969 Bear Creek @ 164 1887 7.5 Apr 15 7.24 225 24 Jul nr 8,600 Morrison, CO 2003 1896 South Platte River 3,861 1889 9 Apr 24 6.12 2,110 17 Jun 18.66 40,300 @ Denver, CO 2003 1965 Clear Creek @ 400 1974 7 Jun 1 7.63 1,760 10 Jul 6.44 2.370 Golden, CO 2003 1983 Clear Creek @ 575 1916 8 Jun 1 3.70 1,910 24 Jul 8.97 5,070 Derby, CO 2003 1965 South Platte River 4,713 1926 11 May 10 7.57 5,280 06 May 11.67 33,000 @ Henderson, 2003 1973 CO South Platte River 9,598 1901 10 Jun 2 7.13 4,670 08 May 11.73 31,500 nr Kersey, CO 2003 1997. South Platte River 23,193 1902 10 May 3 3.46 164 20 Jun 10.44 37,600 @ Julesburg, CO 2003 1965 South Platte River 24,300 1897 12 Aug 2 6.17 411 03 Jun 14.02 37,100 @ North Platte, 2002 1935 NE Platte River @ 56,200 1935 5 Aug 1 4.69 1,500 29 Jun nr 23,500 Brady, NE – North 2002 1983 Channel Platte River nr 58,200 1982 6 Apr 18 3.54 1,800 5.00 Mar 6 29 Jun 7.42 23,700 Kearney, NE 2003 2003 1983 Platte River nr 58,800 1933 4 Mar 12 4.07 1,460 6.69 Jan 30 06 Jun 5.99 30,000 Grand Island, NE 2003 2003 1935 Middle Loup River 8,090 1894 8 May 4 3.99 5,160 4.37 Feb 3 23 Jun nr 72,000 @ St. Paul, NE 2003 2003 1947 North Loup River 4,290 1894 5.5 May 11 3.86 2,440 4.12 Mar 1 06 Jun nr 90,000 @ St. Paul, NE 2003 2003 1896 Elkhorn River @ 2,790 1945 10 May 6 5.64 1,230 14 Jun 8.52 16,900 Norfolk, NE 2003 1967 Elkhorn River @ 5,100 1940 12 May 1 9.52 4,100 11.36 Feb 09 Mar 19.30 90,658 West Point, NE 2003 21 2003 1933 Elkhorn River @ 6,900 1928 17 Apr 30 10.34 16,300 12 Jun 16.60 100,000 Waterloo, NE 2003 1944 Platte River @ 77,100 1949 8 Mar 14 6.41 21,400 6.88 Mar 7 29 Mar 10.04 112,000 North Bend, NE 2003 2003 1960 Platte River @ 85,800 1953 9 May 6 7.23 34,200 24 Jul 11.90 160,000 Louisville, NE 2003 1993 Logan Creek nr 1,030 1941 16 Jun 10 16.36 8,960 20 Feb 20.15 25,200 Uehling, NE 2003 1971 Salt Creek @ 648 1940 20.5 Jun 10 11.23 6,000 14 Jun 18.61 15,300 Lincoln, NE 2003 1998 Salt Creek @ 1,051 1951 20 Aug 22 15.71 11,800 13 Jun 26.50 46,800 Greenwood, NE 2002 1984 Little Papillion 32 1948 17 Aug 23 6.27 180 03 Jun 23.00 nr Creek @ Ivington, 2003 1943 NE Big Papillion 126 1966 Na Aug 23 10.21 1570 05 Jul 38.54 25,800 Creek @ Fort 2003 1998 Street, NE Papillion Creek 384 1948 29 Aug 23 26.10 6070 21 May 30.68 12,700 @ Fort Crook, NE 2003 1982 nr – Not Rated n/a – Not Available

3-16 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

The Omaha District, during this reporting period, again saw substantial flood damages prevented and recreation usage by the general public. This chapter documents the accomplishments for all reservoirs in the District.

a. Flood Damages Prevented. Flood damages prevented in Fiscal Year 2003 (FY03) by Corps of Engineers mainstem reservoirs, tributary reservoirs and local protection projects, and Bureau of Reclamation projects are summarized in Table 4-1 and 4-2. These two tables also show cumulative totals of flood damages prevented for each of the projects. Flood damages prevented in each state are shown in Table 4-3. Rounding errors may be present.

TABLE 4-1 OMAHA DISTRICT PROJECTS FLOOD DAMAGES PREVENTED FY 2003- LOCAL AND MAIN STEM REDUCTIONS

Cumulative Total FY Cumulative Omaha District Thru FY02 MARCH APRIL MAY JUNE JULY AUGUST 2003 Thru FY03 Projects Location ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) Missouri River MRO 2,399,092.1 10,999.4 11.031.5 27,501.3 49,666.0 2,448,758.1 Mainstem Reservoirs

Tributary Reservoir Projects

Aurora Dam/D.S. CO 7,413.2 0 7,413.2 Channel Improv.

Bear Creek Dam CO 2,137.0 0 2,137.0

Bowman-Haley ND/SD 6,505.8 0 6,505.8 Dam

Chatfield Dam CO 5,552.5 0 5,552.5

Cottonwood SD 0 0 0 Springs Dam

Cherry Creek CO 163,442.2 0 163,442.2 Dam

Cold Brook Dam SD 0 0 0

Papillion Creek NE 35,404.5 0 35,404.5 Dams/Chnl. Im.

Pipestem Dam ND 37,940.5 0 37,940.5

Salt Creek NE 83,752.9 0 83,752.9 Dams/Levees

Subtotal: 342,148.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 342,148.6

Missouri River Levee System

L-601 IA 116,636.3 2,005.2 2,510.4 4,515.6 121,151.9

L-594 IA 82,757.3 1,417.9 1,775.1 3,193.1 85,950.4

L-575 IA/MO 87,500.5 868.2 1,962.6 2,830.8 90,331.3

4-1 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

TABLE 4-1 OMAHA DISTRICT PROJECTS FLOOD DAMAGES PREVENTED FY 2003- LOCAL AND MAIN STEM REDUCTIONS

Cumulative Total FY Cumulative Omaha District Thru FY02 MARCH APRIL MAY JUNE JULY AUGUST 2003 Thru FY03 Projects Location ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) L-561/L-550 MO 69,438.2 741.8 1,676.8 2,418.7 71,856.9

L-536 MO 19,998.7 203.1 459.0 662.1 20,660.8

R-613 NE 25,458.9 440.4 551.4 991.9 26,450.8

R-573 NE 3,690.8 37.3 84.3 121.6 3,812.4

R-562 NE 10,775.2 116.0 262.3 378.3 11,153.5

R-548 NE 7,988.4 80.8 182.7 263.5 8,251.9

R-520 NE 2,274.1 24.9 56.2 81.1 2,355.2

Subtotal: 426,518.4 0.0 5,935.7 0.0 9,520.8 0.0 0.0 15,456.6 441,975.0

Local Protection Projects

Belle Fourche R. SD 380.0 0 380.0 @ B. F.

Big Sioux R. @ IA 6,129.2 0 6,129.2 Sioux City

Blackbird Creek NE 1,665.9 0 1665.9 @ Macy

Broken Bow, Mud NE 349.3 0 349.3 Creek

Clarkson, Maple NE 2,642.4 0 2,642.4 Ck.

Columbus, Loup NE 16,908.0 0 16,908.0 River

Council Bluffs, IA 620,408 0 620,408.0 Missouri R.

Deadman Gulch SD 5,792.1 0 5,792.1 @ Sturgis

Emerson, Indian IA 6,983.4 0 6,983.4 Creek

Floyd River @ IA 30,398.9 0 30,398.9 Sioux City

Forsyth, MT 4,164.8 46.7 46.7 4,211.58 Yellowstone R.

Gering Valley NE 1,783.8 0 1,783.8

Glasgow, Milk R. MT 1,345.0 0 1,345.0

Great Falls, Sun MT 10.0 0 10.0 R.

4-2 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

TABLE 4-1 OMAHA DISTRICT PROJECTS FLOOD DAMAGES PREVENTED FY 2003- LOCAL AND MAIN STEM REDUCTIONS

Cumulative Total FY Cumulative Omaha District Thru FY02 MARCH APRIL MAY JUNE JULY AUGUST 2003 Thru FY03 Projects Location ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) Greybull, Bighorn WY 9,784.9 211.0 211.0 9,995.9 R.

Hamburg, IA 198,667.2 0 198,667.2 Nishnabotna R.

Havre, Milk R. MT 47,623.6 0 47,623.6

Hawarden, Dry IA 552.0 0 552.0 Creek

Herreid, Spring SD 33.0 0 33.0 Creek

Hooper, Elkhorn NE 4,191.9 0 4,191.9 R.

Hot Springs, Fall SD 0.0 0 0.0 R.

Howells, E. Fork NE 1,200.0 0 1,200.0 of Maple Ck.

Ida Grove, Maple IA 1,877.2 255.2 0 2,132.4 R.

Kenslers Bend SD/NE 43,638.0 914.0 914.0 44,552.0**

Little Papillion Ck. NE 20,744.1 0 20,744.1 @ Omaha

Little Sioux River IA 178,178.3 2,536.5 1,745.6 4,282.1 182,460.4

Lodgepole Ck. @ NE 31,200.2 0 31,200.2 Sidney

Lost Creek @ NE 3.0 0 3.0 Columbus

Madison, NE 6,520.3 0 6,520.3 Union/Taylor Cks.

Mandan, Heart R. ND 39,902.7 570.3 570.3 40,473.0

Marmarth, Little ND 1,449.0 0 1,449.0 Missouri R.

Meadow Grove, NE 733.6 0 733.6 Buffalo Ck.

Norfolk, Elkhorn NE 37,104.8 0 37,104.8 River

Omaha, Missouri NE 693,505.0 0 693,505.0 River

Pebble Ck. @ NE 17,928.5 0 17,928.5 Scribner

4-3 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

TABLE 4-1 OMAHA DISTRICT PROJECTS FLOOD DAMAGES PREVENTED FY 2003- LOCAL AND MAIN STEM REDUCTIONS

Cumulative Total FY Cumulative Omaha District Thru FY02 MARCH APRIL MAY JUNE JULY AUGUST 2003 Thru FY03 Projects Location ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) Pierce, N. F. NE 999.0 0 999.0 Elkhorn R.

Platte R. @ NE 3,165.6 24.8 24.8 3,190.4 Schuyler

Red Dale Gulch SD 250.0 0 250.0

Red Oak, E. IA 28,092.3 42.6 42.6 28,134.9 Nishnabotna R.

Saco, Beaver Ck. MT 1,210.5 0 1,210.5

Schuyler, Lost NE 394.0 0 394.0 Ck.

Scranton, Buffalo ND 0.0 0 0.0 Ck.

Scribner, Elkhorn NE 512.1 0 512.1 R.

Sheridan, Goose WY 1,504.1 0 1,504.1 Ck.

Shields R. @ MT 156.0 0 156.0 Clyde Park

Sioux Falls, Big SD 19,192.0 12.4 0 19,192.0 Sioux R.

Vaughn, Sun R. MT 485.0 0 485.0

Waterloo, Elkhorn NE 470.0 0 470.0 R.

W. Glendive, MT 15,072.6 0 15,072.6 Yellowstone R.

West Point, NE 23,552.7 0 23,552.7 Elkhorn R.

Subtotal: 2,128,854.0 865.2 0.0 42.6 2,791.7 1,745.6 914.0 6,359.1 2,135,213.1

Other Projects

McCook Lake SD 0 0 0***

Total Corps N.W.O. 5,296,613.1 11,864.6 16,967.3 42.6 39,947.5 1,745.6 914.0 71,481.7 5,368,094.8 Projects:

* Includes Missouri River Levees L-627 and L-624. ** Based on estimates of annual benefits. Project serves other than flood control purposes. *** $521,000 recreational benefits through FY03 cumulative at the rate of $11,000 annually.

4-4 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

TABLE 4-2 BUREAU OF RECLAMATION PROJECTS FLOOD DAMAGES PREVENTED FY03 – LOCAL AND MAIN STEM REDUCTIONS

Cum. Cum. Thru Total Thru FY02 MARCH APRIL MAY JUNE JULY AUGUST FY03 FY03 River Basin District Location ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) Big Horn River Boysen WY 76,502.5 1,579.7 264.5 2,937.1 4,781.3 81,283.8

Buffalo Bill WY 9,697.4 869.9 869.9 10,567.3

Bull Lake WY 2,690.3 0.0 2,690.3

Yellowtail MT 95,012.1 964.0 203.1 5,072.3 6,239.5 101,251.6

Subtotal: 183,902.3 2,543.8 467.6 869.9 8,009.4 0.0 0.0 11,890.7 195,793.0

Cheyenne River Angostura SD 21.1 0.0 21.1

Keyhole WY/SD 3,652.8 74.1 29.2 103.3 3,756.1

Pactola SD 3,106.7 10.2 10.2 3,116.9

Subtotal: 6,780.6 0.0 84.3 0.0 29.2 0.0 0.0 113.5 6,894.1

Grand River Shadehill SD 8,974.5 53.7 53.7 9,028.2

Heart River Heart Butte ND 13,161.6 38.6 88.2 7.3 134.1 13,295.7

James River Jamestown ND 86,672.3 0.0 86,672.3

Marias River Tiber MT 57,190.5 559.7 89.4 828.3 1,477.5 58,668.0

Milk River Fresno MT 13,059.2 0.0 13,059.2

Missouri River Canyon MT 136,317.9 1,281.2 108.6 424.9 1,814.7 138,132.6 Ferry North Platte Pathfinder WY 8,760.2 0.0 8,760.2 River Alcova WY 477.6 3.6 3.6 481.2

Seminoe WY 27,642.9 203.4 203.4 27,846.3

Guernsey WY 439.0 0.0 439.0

Glendo WY/NE 62,542.3 5,454.0 5,454.0 67,996.3

Subtotal: 99,862.0 0.0 0.0 0.0 5,660.9 0.0 0.0 5,660.9 105,522.9

Sun River Gibson MT 3,044.2 0.0 3,044.2

Threeforks Clark MT 11,950.1 304.8 48.5 7.3 360.6 12,310.7 Basin Canyon Total Bureau 620,915.2 4,728.1 940.3 869.9 14,967.4 0.0 0.0 21,505.7 642,420.9 Projects:

4-5 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

TABLE 4-3 FLOOD DAMAGES PREVENTED BY STATE, OMAHA DISTRICT, FY 2003

Corps Main Bureau of Local Main Stem Rec. Bureau Corps Protection Corps Main Stem Non- Dams of Rec. Local Channels Supported Stem Urban Urban (Main Dams Protection and Emergency Dams Levees Levees Stem) (Local) Dams Levees Operations TOTAL State ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) ($1,000) Colorado 0 0 0 0 0 0 0 0 0

Iowa 6,221.9 0 10,228.1 0 0 0 4,579.8 0 21,029.8

Missouri 7,047.7 0 3,392.2 0 0 0 0 0 10,439.9

Montana 0 0 0 9,892.3 0 0 46.7 0 9,939.0

Nebraska 13,269.5 0 1,836.4 0 4,363.2 0 481.8 0 19,950.9

N. Dakota 23,126.9 0 0 95.5 38.6 0 570.3 0 23,831.3

S. Dakota 0 0 0 115.5 0 0 469.4 0 584.9

Wyoming 0 0 0 4,832.9 2,167.7 0 211.0 0 7,211.6

TOTAL 49,666.0 0.0 15,456.7 14,936.2 6,569.5 0.0 6,359.0 0 92,987.4

b. Recreation Usage. Visitation hours for each Corps of Engineers project for FY97, FY98, FY99, FY99, FY01, FY02, and FY03 are tabulated in Table 4-4.

TABLE 4-4 RECREATION VISITATION HOURS

Project Name FY97 FY98 FY99 FY00 FY01 FY02 FY03

Bowman-Haley 300,400 269,900 418,100 567,600 551,200 464,300 412,100

Cottonwood Springs 135,600 135,600 144,800 147,900 121,600 98,000 96,300

Cold Brook 63,500 63,500 59,500 89,600 38,900 36,800 26,000

Pipestem 153,100 155,200 200,000 207,000 162,100 198,800 184,300

Papillion Creek No. 11 616,100 451,100 378,500 42,830 794,500 541,600 1,013,100 Glenn Cunningham Dam Papillion Creek No. 16 162,400 184,600 183,600 170,500 251,700 265,000 315,200 Standing Bear Dam Papillion Creek No. 18 822,600 841,000 831,400 866,900 871,500 910,400 426,700 Zorinsky Dam Papillion Creek No. 20 544,800 634,700 617,700 978,600 892,700 1,035,300 919,800 Wehrspann Dam

4-6 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

TABLE 4-4 RECREATION VISITATION HOURS

Project Name FY97 FY98 FY99 FY00 FY01 FY02 FY03

Papillion Creek Subtotal: 2,145,900 2,111,400 2,833,600 3,070,930 3,684,400 3,550,200 3,393,500

Chatfield 4,977,600 4,939,600 4,928,600 5,522,600 5,852,700 7,538,200 7,799,700

Cherry Creek 7,950,000 8,029,500 8,151,100 9,029,700 8,196,700 8,697,700 9,154,200

Bear Creek 957,700 1,150,200 1,151,100 1,199,800 1,136,400 1,963,000 1,458,100

Tri-Lakes Subtotal: 13,885,300 14,119,300 14,230,800 15,752,100 15,185,800 18,198,900 18,412,000

Salt Creek No. 2 74,600 77,500 51,100 41,800 76,400 78,300 76,800 Olive Creek Salt Creek No. 4 110,200 114,400 81,300 88,700 90,200 85,300 81,900 Blue Stem Salt Creek No. 8 95,300 83,000 75,000 72,100 100,400 100,800 92,000 Wagon Train Salt Creek No. 9 79,000 111,300 190,000 82,100 76,100 130,600 119,300 Stagecoach Salt Creek No. 10 448,700 34,900 44,300 39,600 37,700 167,300* 47,5001 Yankee Hill Salt Creek No. 12 244,100 165,100 198,900 204,000 204,900 571,400* 398,300 Conestoga Salt Creek No. 13 36,800 48,300 38,100 34,300 39,300 36,300 46,800 Twin Lakes Salt Creek No. 14 922,100 679,500 683,300 644,600 765,600 956,500 938,700 Pawnee Salt Creek No. 17 1,159,000 1,150,500 930,600 1,065,700 1,291,200 918,300 683,3002 Holmes Lake Salt Creek No. 18 1,618,300 1,103,900 1,123,000 1,173,300 1,305,400 867,700 1,148,700 Branched Oak Lake

Salt Creek Subtotal: 4,392,400 3,573,600 3,483,100 3,451,000 3,922,800 3,912,500 3,633,300

TOTAL: 22,485,500 19,299,700 20,338,000 20,515,400 22,745,830 25,660,800 25,438,800

FY02 * Lower water levels due to drought and localized road construction caused shift in use patterns. FY03 1 NE Game and Parks drawing lake down for habitat improvement. 2 City of Lincoln drawing lake down to remove silt.

4-7 CHAPTER 4 RESERVOIR ACCOMPLISHMENTS

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4-8 CHAPTER 5 RESERVOIR OPERATIONS

Actual operations for the past year and proposed operations through calendar year 2003 are briefly discussed in the following sections. Individual project operation summaries are contained in Appendices A through K for both Corps of Engineers projects and Bureau of Reclamation projects. Table 5-1 summarizes the tributary reservoir flood control operation for the 2003 water year. A tabulation of the number of cases that the exclusive flood control zones in the 36 Omaha District tributary reservoirs have been filled to 25, 50, 75, and 100 percent is shown in Table 5-2.

TABLE 5-1 TRIBUTARY RESERVOIR FLOOD CONTROL OPERATION (2003 WATER YEAR)

Flood Daily Max. Daily Max. % Control Date in Flood Max. Date of Storage of FC Max. Max. Pool Control Operation Pool Max. (FC Pool Pool Inflow Outflow Name of Dam (Ft-Msl) Pool (Ft-Msl) Pool Acre-Feet1) Occupied (CFS) (CFS) COE Reservoirs Bear Creek 5558.0 Apr-Jul 5561.2 14 Apr 350 1.2 250 281 Bowman-Haley 2754.8 None 2751.4 27 May 0 0 129 0 *Bull Hook 2517.0 None n/a n/a 0 0 n/a n/a *Cedar Canyon 3526.0 None n/a n/a 0 0 n/a n/a Chatfield 5432.0 Jan-Apr 5433.4 24 Mar 2070 1.0 580 634 Cherry Creek 5550.0 Feb-Jul 5552.4 28 Apr 2120 1.9 572 151 Cold Brook 3585.0 None 3584.2 19 Mar 0 0 3 1 Cottonwood 3936.0 None 3864.6 01 Aug 0 0 2 0 *Kelly Road 5342.0 None n/a n/a 0 0 n/a n/a Papio No. 11 1121.0 All year 1122.0 15 May 400 2.9 66 25 Papio No. 16 1104.0 Aug-Oct, May, Jun 1105.2 05 May 160 4.3 87 21 Papio No. 18 1110.0 Aug, Oct-Nov, Feb- 1111.6 23 Aug 420 3.9 120 46 Jul Papio No. 20 1095.8 None 1094.6 27 Aug 0 0 135 0 Pipestem 1442.5 Mar-Jul 1449.5 24 May 7410 5.2 274 128 Salt Ck No. 2 1335.0 None 1330.5 01 Aug 0 0 14 4 Salt Ck No. 4 1307.4 Oct, Nov, May-Jul 1309.7 12 Jun 610 8.6 243 83 Salt Ck No. 8 1287.8 June 1289.3 12 Jun 470 6.9 211 49 Salt Ck No. 9 1271.1 Nov-Jul 1273.6 23 Jun 550 11.6 286 64 Salt Ck No. 10 1244.9 Oct 1238.0 04 Oct 0 0 104 20 Salt Ck No. 12 1232.9 Intermittent 1233.8 13 Jun 220 2.8 213 33 Salt Ck No. 13 1341.0 May-Jun 1342.6 12 Jun 440 8.4 211 100 Salt Ck No. 14 1244.3 May-Jun 1244.9 12 Jun 490 2.4 359 29 Salt Ck No. 17 1242.4 Aug-Oct 1244.3 25 Aug 240 4.1 133 73 Salt Ck No. 18 1284.0 None 1280.1 21 May 0 0 134 4 *Westerly Creek 5389.0 None n/a n/a 0 0 n/a n/a USBR Reservoirs Boysen 4725.0 None 4704.5 05 Jul 0 0 6043 1372 Canyon Ferry 3797.0 Jun 3797.7 25 Jun 22060 21.8 20361 9958 Clark Canyon 5546.1 None 5522.2 15 May 0 0 296 810 Glendo 4635.0 None 4631.1 20 Jun 0 0 3268 7477 Heart Butte 2064.5 Mar-Jun 2070.3 20 Mar 20,670 14.1 6303 3108 Jamestown 1431.0 Apr-Jul 1432.5 22 May 6150 3.2 564 200 Keyhole 4099.3 None 4092.3 01 Jul 0 0 1450 150 Pactola 4580.2 May-Jun 4580.7 17 Jun 440 1.0 160 110 Shadehill 2271.9 None 2264.6 01 Aug 0 0 845 23 Tiber 2993.0 None 2991.8 26 Jun 0 0 3174 1109 Yellowtail 3640.0 None 3616.0 07 Jul 0 0 7515 2323 *Dry dams with no gauge readings taken.

1 If a project has a joint use pool, storage in the joint use zone is not counted as flood control in this table.

5-1 CHAPTER 5 RESERVOIR OPERATIONS

a. Previous Year Operations (August 1, 2002 through July 31, 2003).

i Corps of Engineers Lakes. All of the Corps' tributary projects, within the Omaha District, were regulated in accordance with normal procedures during the period covered by this report. As shown on Table 5-1, tributary projects TABLE 5-2 including Bear Creek, Chatfield, UTILIZATION OF EXCLUSIVE FLOOD CONTROL Cherry Creek, Papillion Creek ZONE, OMAHA DISTRICT TRIBUTARY PROJECTS Percent of Flood Control Storage Dams Nos. 11, 16, 18, Pipestem, Total of Salt Creek Dams Nos. 4, 8, 9, 12, Year Tributary 25% or 50% or 75% or 100% Projects More More More or More 13, 14, and17, stored water in the 1967 26 3 2 2 0 flood storage zone during the 1968 27 0 0 0 0 1969 27 1 0 0 0 report period. Bowman-Haley, 1970 28 2 2 0 0 Bull Hook, Cedar Canyon, Cold 1971 28 2 1 0 0 Brook, Cottonwood, Kelly Road, 1972 28 1 0 0 0 1973 28 6 2 1 0 Papillion Creek Dam No. 20, Salt 1974 31 1 1 0 0 Creek Dams Nos. 2, 10, 18, and 1975 32 6 2 1 1 1976 32 2 1 0 0 Westerly Creek did not store 1977 32 0 0 0 0 water in their flood control zones 1978 33 5 1 0 0 during the reporting period. Low 1979 33 1 0 0 0 1980 33 2 1 0 0 inflow and/or maintenance were 1981 33 2 1 1 0 the main reasons for this lack of 1982 33 2 1 0 0 storage usage. There were no 1983 34 5 1 1 0 1984 35 7 2 1 1 major floods during the reporting 1985 35 0 0 0 0 period and most projects had 1986 35 5 0 0 0 1987 35 3 0 0 0 normal to below normal inflows 1988 35 0 0 0 0 over the reporting period. 1989 35 0 0 0 0 Detailed operation reports for 1990 36 0 0 0 0 1991 36 2 1 0 0 each project are included in an 1992 36 0 0 0 0 appendix at the end of this report. 1993 36 12 0 0 0 1994 36 2 0 0 0 1995 36 6 3 0 0 ii Bureau of 1996 36 6 1 0 0 Reclamation Dams. Reservoir 1997 36 6 3 0 0 1998 36 3 1 1 0 operations at 10 of the 11 Bureau 1999 36 5 2 0 0 of Reclamation projects in the 2000 36 1 0 0 0 Omaha District were carried out in 2001 36 2 0 0 0 2002 36 0 0 0 0 accordance with normal regulation 2003 36 0 0 0 0 procedures during this reporting TOTAL 101 29 8 2 period. The only exception was Canyon Reservoir in Montana where an operating deviation was requested. Details of the operation at Canyon Ferry are stated in appendix K. As shown in Table 5-1, four of the eleven Section 7 projects including Heart Butte (North Dakota), Pactola (South Dakota), Jamestown (North Dakota), and Canyon Ferry (Montana) stored water in the flood storage zone during the report period. Detailed operation reports for each project are included in an appendix at the end of this report.

5-2 CHAPTER 5 RESERVOIR OPERATIONS

b. Proposed Operations. With the exception of Bear Creek, Cherry Creek, Chatfield and Pipestem, all Corps of Engineers tributary dams have ungated service outlets and no gate operations are normally required except for occasional opening of low-level outlets for various purposes. Releases to meet downstream water rights can be expected at Bowman Haley, Cold Brook, Chatfield, Cherry Creek, Bear Creek, and Salt Creek No. 18. Evacuation of stored floodwater in these projects is scheduled as soon as practicable after each flood event.

i Corps of Engineers.

(1) Colorado. At Chatfield Reservoir, the pool level normally fluctuates between elevations 5423.0 and 5432.0 feet mean sea level (ft-msl). Due to the extended drought conditions in the South Platte River Basin, it is possible that Chatfield Reservoir will be drawn down below elevation 5423.0. An environmental assessment (EA) is being prepared to evaluate the impacts of a drawdown. During the Colorado irrigation season, the Water Control and Water Quality Section and the State Engineer will calculate inflows to Cherry Creek Reservoir on a daily basis and releases will be balanced on a weekly basis to comply with State water rights. The Colorado Department of Parks and Recreation has been working to obtain water from several sources, including the Denver metro sewer return flows, to exchange with calls made against Cherry Creek. Releases will be made at Cherry Creek Reservoir in May or June to flush sediment from around the gates in the intake structure. Flushes will not be scheduled during the December through March period or if there is downstream flooding. The flushing schedule utilizes approximately 150 to 250 acre-feet of water. At Bear Creek Reservoir, the low-level gate will be opened, if requested and practical, during the June through August period when the lake typically stratifies to assist in the improvement of lake water quality. If the lake falls below elevation 5558.0 feet msl, releases from the low level gates may be needed in order to satisfy downstream water rights requests. All other operations of the Colorado reservoirs will be made in accordance with the individual water control plan.

(2) Nebraska. At Salt Creek Dam 18, releases of inflows up to a total of 11.6 cfs may be made for water rights calls from downstream landowners. Releases up to 3 cfs without proving inflow will be made when required to satisfy downstream water rights. Low-level releases will be made when practicable from the Papillion Creek projects to allow water to be discharged from lower elevations in an attempt to improve lake water quality. Salt Creek Dam 10 and 17 are drawn down to permit lake rehabilitation by the Nebraska Game and Parks Commission. The rehabilitation projects at both Salt Creek 10 and Salt Creek 17 are expected to wrap up during the summer of 2004. At that point, the reservoirs will be allowed to fill to normal levels. Spring inflows will be allowed to refill the remaining reservoirs up to the top of conservation pool. All other operations of the Nebraska reservoirs will be done in accordance with the individual reservoir water control plan.

(3) North Dakota. Flood releases from Pipestem Dam will be coordinated with those from the Bureau's Jamestown Dam. Operation of Jamestown and Pipestem

5-3 CHAPTER 5 RESERVOIR OPERATIONS

Reservoirs will follow the release plan that was developed in the Water Control Plan Review and Update Study. This study was completed in 2000. The plan is termed a “flexible” plan in that the operation of the two reservoirs and releases could vary from year to year. Each spring a forecast will be prepared, the James River Operations Meeting will be held with other agencies and interested parties, and a plan of operation will be developed based on the forecast and feedback from the other agencies. During low and low-medium runoff years where combined inflow is less than 90,000 acre-feet a constant release will be made. This type of operation will stretch releases out through the typically dry summer and fall months providing benefits to downstream fish and wildlife resources. During upper-medium runoff years, where combined inflow is in the range of 90,000 acre-feet to 160,000 acre-feet, releases will follow the 1975 Field Working Agreement (FWA) except that even greater priority will be placed on evacuating Jamestown Reservoir before Pipestem. This will result in benefits to Arrowwood National Wildlife Refuge located upstream of Jamestown Reservoir. During high runoff years where combined inflow is greater than 160,000 acre-feet the operation of the two projects will follow the 1975 FWA. Details of the “flexible” operation plan can be found in the study report and will also be incorporated into a new field working agreement. At Bowman-Haley Reservoir, the water quality improvement program calls for releases from the low-level drawdown tube during periods of pronounced lake stratification that typically occur in late winter and again in late summer around mid July. If the local sponsor concurs and winter downstream conditions permit, water will be evacuated from the lower elevations of the reservoir each year starting in early February.

(4) South Dakota. The pool level at Cold Brook Dam will be lowered following ice-out in the spring to elevation 3582 ft-msl. This level is 3 feet below the morning glory service spillway. It will be maintained at this lower level through the summer and fall months by either periodically making a small release through the low level gates or by utilizing the newly installed 8 inch valve in the tailrace of the project. This will provide a small buffer of storage that delay or prevent uncontrolled spillway flow. In order to comply with Larive Lake Resort’s water rights, the resort may request a release of up to 1.1 cfs.

ii Bureau of Reclamation. As in the past, the Bureau will continue to operate their reservoirs to meet flood control commitments and to coordinate operations with other interests to achieve optimum use of water resources. Generally, all reservoirs will be operated as close to the top of their conservation pools as possible. Boysen, Canyon Ferry, Clark Canyon, Tiber and Yellowtail Reservoirs require evacuation and refill of joint-use storage for flood control based on mountain runoff inflow forecasts.

(1) Canyon Ferry. The Canyon Ferry Reservoir Operating Plan requires that releases are adjusted as soon as the storage has peaked, usually in June or July, so the pool will be drawn to near elevation 3780.0 ft-msl by the following 1 March. In addition, the Montana Power Company will try to limit releases from Hebgen Reservoir to keep Canyon Ferry’s pool below elevation 3794.0 ft-msl after 1 December. A pool

5-4 CHAPTER 5 RESERVOIR OPERATIONS

level below elevation 3794.0 ft-msl prior to winter freeze up is desired to prevent ice jam problems at the upper end of the lake. Beginning near the first of January, releases will be set based on the most probable spring-inflow forecast to allow the reservoir to fill to elevation 3797.0 ft-msl near the end of June.

(2) Tiber (Lake Elwell). In accordance with the Water Control Agreement, the joint-use zone at Tiber Reservoir should be vacated to elevation 2976.0 ft-msl by March 1st. March-June releases are based on forecasted inflows with the objective of filling Lake Elwell to elevation 2993.0 ft-msl by the end of June. However, if necessary, the Bureau may decide to fill the reservoir to elevation 3008.0 ft-msl to provide replacement storage. This storage will be used by the Corps of Engineers to assist in the operation of the Missouri River mainstem reservoir system.

(3) Yellowtail. Yellowtail Reservoir will be regulated to be no higher than elevation 3630.0 ft-msl by 30 November to reduce chances of headwater ice problems. The drawdown will continue through the winter months so that the pool elevation will be no higher than 3605.0 ft-msl before the beginning of spring runoff based on a normal runoff forecast. March through July releases will be based on forecasted inflows with the objective of filling Yellowtail Reservoir to elevation 3640.0 ft-msl by the end of July.

(4) Others. Replacement storage up to a combined total of 1,075,500 acre- feet can be made available in Clark Canyon, Tiber and Canyon Ferry Reservoirs on a forecast basis. Fresno Reservoir in Montana is lowered each year and regulated to provide flood control in accordance with a 4 July 1957 Letter of Understanding. In addition to the reservoirs covered in this report, other Bureau reservoirs, without allocated flood control storage space, will provide flood control in their normal operation of storing seasonal runoff. Some of these projects are Gibson Dam in Montana and Bull Lake, Pathfinder, Seminoe, and Buffalo Bill Dams in Wyoming.

5-5 CHAPTER 5 RESERVOIR OPERATIONS

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5-6 CHAPTER 6 MAJOR REGULATION ISSUES

There were several areas where major regulation issues may arise. This chapter will detail the regulation issues dealing with water quality, downstream channel capacity, potential hazardous conditions and dam safety.

a. Water Quality. The Omaha District has identified the following four general water quality priorities that have relevance to the tributary projects:

· Evaluate water quality conditions and trends at Corps projects.

· Identify existing and potential water quality problems at Corps projects, and develop and implement appropriate solutions.

· Provide water quality information to support Corps reservoir regulation elements for effective water quality and aquatic habitat management.

· Provide water quality information and technical support to the States in the development of their Section 303(d) lists and development and implementation of TMDLs at Corps projects.

Water quality data was collected at the tributary projects as identified in Table 8- 2. Water quality data are assessed by the District's Water Quality Unit to identify any water quality concerns, including compliance with State water quality standards, at the tributary projects. Other water quality information, including State 303(d) and 305(b) Reports, are also reviewed for indications of water quality concerns at the projects. Table 6-1 provides a summary of water quality issues and concerns at each of the tributary projects, based on Omaha District monitoring and a review of current State water quality reports.

6-1 CHAPTER 6 MAJOR REGULATION ISSUES

TABLE 6-1 WATER QUALITY ISSUES AND CONCERNS

Other Potential Fish Consumption Water TMDL Considerations* Advisories Project Quality Concerns On 303(d) Impaired Pollutant/Stressor TMDL Status*** Advisory Identified List Uses in Effect Contaminate Colorado: Bear Creek Lake No No Nutrients Urbanization Chatfield Lake No No Nutrients Urbanization Cherry Creek Lake Yes Aquatic Life Chlorophyll a Under Revision No Nutrients Recreation Urbanization Nebraska: Bluestem Lake Yes Aesthetics Nutrients TBD No Aquatic Life Branched Oak Lake Yes Aesthetics Nutrients TBD No Aquatic Life Conestoga Lake Yes Aesthetics Nutrients TBD No Aquatic Life Sedimentation East Twin lake Yes Aesthetics Nutrients TBD No Aquatic Life Ed Zorinsky Lake Yes Aesthetics Nutrients Completed Yes Mercury Urbanization Aquatic Life Sedimentation Glen Cunningham Yes Aesthetics Nutrients TBD No Urbanization Lake Aquatic Life Sedimentation Holmes Lake Yes Aesthetics Nutrients Completed No Urbanization Aquatic Life Sedimentation Olive Creek Lake Yes Aesthetics Nutrients TBD No Aquatic Life Sedimentation Low Dissolved Oxygen Pawnee Lake Yes Aesthetics Nutrients Completed No Aquatic Life Stagecoach Lake Yes Aesthetics Nutrients TBD No Aquatic Life Sedimentation Standing Bear Lake Yes Aesthetics Nutrients Completed No Urbanization Aquatic Life Sedimentation Wagon Train Lake Yes Aesthetics Low Dissolved Completed No Aquatic Life Oxygen Nutrients Wehrspann Lake Yes Aesthetics Nutrients TBD Yes Mercury Urbanization Aquatic Life West Twin Lake Yes Aesthetics Low Dissolved TBD No Aquatic Life Oxygen Nutrients Yankee Hill lake Yes Aesthetics Nutrients Completed No Aquatic Life Sedimentation North Dakota: Bowman-Haley Lake No Yes Mercury Pipestem Lake No Yes Mercury South Dakota: Cold Brook Lake No No Cottonwood Springs No No Lake * Information taken from published state Total Maximum Daily Load (TMDL) 303(d) reports and listings. ** Includes significant fish kills and algal blooms. *** TBD = To Be Developed.

b. Downstream Channel Capacity. Inadequate or reduced channel capacity is a problem below many of the tributary reservoirs. This was caused by several factors, including natural plant growth during extended low flow periods, flood deposits, human

6-2 CHAPTER 6 MAJOR REGULATION ISSUES

construction, and agriculture practices. In some cases, downstream channel capacity is significantly less than is needed for flood control releases. For example, the channel downstream of Cold Brook Dam has been filled due to residential construction. The channel capacity of the South Platte River below the Tri-Lakes projects hinders or prevents releases in accordance with the three-reservoir (Chatfield, Bear Creek, and Cherry Creek) plan of regulation to evacuate flood storage. Compounding this situation is the fact that the reservoir design routings for Chatfield, Bear Creek and Cherry Creek Reservoirs were made independently of each other and that the individual routings neglected (1) the effect of the releases from the other two dams in the three-reservoir system, (2) the effect of the incremental runoff below the dams, and (3) the actual channel capacity below the three dams.

c. Releases for Purposes other than Authorized Project Functions. No releases were made for purposes other than authorized project functions.

d. Potential Hazardous Conditions. A potential problem exists if water is released through project spillways where the land downstream of the project has been developed into urban areas. A hazard-to-life condition exists if a significant flow of water is discharged through the spillways at these projects.

e. Dam Safety Issues. There also is a hazard-to-life condition if a flood event occurs that causes overtopping of the dam embankment. Dams located above populated areas are normally designed to safely pass a Probable Maximum Flood (PMF) without overtopping the embankment. The PMF is estimated using probable maximum precipitation estimates developed by the National Weather Service. Recent studies indicate that nine Corps of Engineers and nine Bureau of Reclamation tributary reservoirs cannot safely pass the PMF without being overtopped. Following is information on each of these projects along with the status of potential corrective actions:

i Corps of Engineers Dams.

(1) Cherry Creek Dam. Corps of Engineers design guidance for dams located above populated areas states they should store and pass a PMF without overtopping the embankment. The most recent precipitation estimates for this area indicate that the reservoir could safely pass no more than 75% of the PMF under existing development with adequate freeboard. The probability of overtopping of the Cherry Creek embankment is very remote. However, the consequences of failure would be catastrophic. The population within the potential Cherry Creek flood area downstream from the dam is estimated to be as high as 138,000. Potential flood damages are nearly $3 billion for the with dam failure condition. The dam safety evaluation study, to determine optimal solutions to the hydrologic inadequacy of Cherry Creek Reservoir is currently underway. Scheduled work in FY2004 includes development of the PMF using revised Probable Maximum Precipitation (PCP) values.

6-3 CHAPTER 6 MAJOR REGULATION ISSUES

(2) Cold Brook Dam. On August 11, 1993, the revised draft reconnaissance report for the Cold Brook Dam hydrologic improvement assessment was completed. The report concluded that the Cold Brook project was hydrologically deficient as it could safely pass only 48 percent of the PMF with adequate freeboard. A dam safety evaluation study was initiated in FY 2000 to determine optimal solutions to the hydrologic inadequacy of Cold Brook Dam. The study received funding for FY 2004, and is due to be complete by the end of September 2004.

(3) Salt Creek Dams. Recent studies indicate that Salt Creek Dams 4,8, 9,13,14,17, and 18 will be overtopped by the PMF and all of the projects would have less freeboard than originally designed. This is a result of spillway crests that are higher than the original design and dam crests that are lower than the original design. In addition, new criteria for the antecedent flood prior to the PMF results in a higher maximum pool during the PMF routing. Funds have been requested to restore the spillway crests and dam crests to the original design elevations. In addition, a memorandum has been sent to HQUSACE requesting that the National Weather Service (NWS) conduct an antecedent storm analysis for Eastern Nebraska.

ii Bureau of Reclamation Dams.

(1) Clark Canyon Dam. The PMF for Clark Canyon Dam is characterized by a peak inflow of 166,800 cfs and a 30-day volume of about 506,000 acre-feet. Clark Canyon Dam would be overtopped at approximately 58 percent of the volume of the PMF.

(2) Canyon Ferry Dam. A peak inflow of 506,000 cfs and a 15-day volume of about 2,035,000 acre-feet characterize the PMF for Canyon Ferry Dam. Floods exceeding approximately 94 percent of the PMF would overtop canyon Ferry Dam. The increased loading associated with unusually high reservoir water surfaces could also cause the failure of one or more spillway gates.

(3) Tiber Dam. The PMF is characterized by a peak inflow of 695,926 cfs and a 15-day volume of 1,433,000 acre-feet. Tiber Dam would be overtopped by floods exceeding 59 percent of the PMF.

(4) Boysen Dam. A peak inflow of 845,000 cfs and a 15-day volume of 2,820,000 acre-feet characterize the PMF. Floods exceeding approximately 48 percent of the PMF would overtop Boysen Dam.

(5) Yellowtail Dam. The PMF is characterized by a peak inflow of 887,000 cfs and a 15-day volume of 4,700,000 acre-feet. Yellowtail Dam would be overtopped by floods exceeding 31 percent of the PMF.

6-4 CHAPTER 6 MAJOR REGULATION ISSUES

(6) Heart Butte Dam. A peak inflow of 161,400 cfs and a 15-day volume of 558,600 acre-feet characterize the PMF. Heart Butte Dam was modified in 1987 to safely pass the PMF.

(7) Jamestown Dam. The PMF is characterized by a peak inflow of 110,200 cfs and a volume of 589,500 acre-feet. Floods exceeding approximately 91 percent of the PMF would overtop Jamestown Dam.

(8) Keyhole Dam. The PMF is characterized by a peak inflow of 513,600 cfs and a 5-day volume of 785,800 acre-feet. Keyhole Dam would be overtopped by floods exceeding approximately 75 percent of the PMF.

(9) Pactola Dam. A peak inflow of 321,240 cfs and a volume of 159,800 acre-feet characterize the PMF. The PMF has not been revised since 1981. Pactola Dam was modified in 1985-87 to safely pass the PMF.

(10) Shadehill Dam. The PMF is characterized by a peak inflow of 423,200 cfs and a volume of 1,324,900 acre-feet. Shadehill Dam would be overtopped by floods exceeding approximately 77 percent of the PMF.

(11) Glendo Dam. A peak inflow of 627,100 cfs and a volume of 2,197,000 acre-feet characterize the PMF. Floods exceeding approximately 40 percent of the PMF would overtop Glendo Dam. The frequency and nature of extreme floods was not sufficient to adequately define risks associated with the hydrologic failure mode. Overtopping failure of Glendo Dam could lead to the failure of dams downstream (Guernsey Dam and Kingsley Dam). The dam failure floods would have catastrophic consequences along the North Platte and Platte Rivers in Wyoming and Nebraska. The Bureau of Reclamation is completing additional flood frequency, paleohydrologic, and hydrograph analyses to better define the frequency and nature of extreme floods in this basin. The results of these analyses will be utilized to better define the hydrologic risks at Glendo. Potential future risk reduction actions will be dependent upon the results of these analyses.

6-5 CHAPTER 6 MAJOR REGULATION ISSUES

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6-6 CHAPTER 7 WATER CONTROL MANUALS

A responsibility of the Water Control and Water Quality Section is to update the water control manuals for each project on a periodic basis. During the reporting period, work progressed on several Water Control Manual updates. This chapter details the current status of updates as well as the schedule for updating the balance of the project manuals.

a. Current Manual Status. The draft water control manual updates for the Chatfield, Cherry Creek, and Bear Creek projects are complete and under review. During the public involvement process, most of the public comment involved issues of reallocation of a portion of the flood control storage to multipurpose storage, including water supply storage. Since this type of reallocation of storage was beyond the scope of a water control manual update, scoping for a General Investigation (GI) funded reallocation study was initiated in conjunction with the state of Colorado. The draft water control manual updates do not contain an evaluation of alternative water control plans. These water control updates will be completed in FY 04. The Chatfield Reallocation Study is expected to be completed in FY 05. Funding was received in FY 96 for initiation of water control manual updates for Pipestem and Jamestown Reservoirs. Phase I work included developing and updating hydrologic models. Phase II work included updating stage-damage relationships and initiating environmental assessments, and evaluation of operational alternatives. Phase III work included selection of the preferred alternative and completion of the public involvement process. Phase IV work, to be completed in FY 04, will include the completion of the manual and final review of the updated manuals.

b. Work Priorities. TABLE 7-1 Water control manuals will WORK PRIORITIES FOR UPDATING WATER CONTROL MANUALS typically be updated on an approximate 10-year Priority Project Remarks cycle. If funds are not 1 Pipestem/Jamestown Scheduled completion FY-04 available for a comprehensive review 2 Lake Audubon Scheduled completion FY-04 and update of a water control manual, at a 3 Canyon Ferry Scheduled completion FY-04 minimum "baseline" O&M 4 Chatfield Scheduled completion FY-04 funds will be used to update area-capacity 5 Bear Creek Scheduled completion FY-04 curves, rating curves, 6 Cherry Creek Scheduled completion FY-04 stage-damage curves, historical records, and 7 Cold Brook Scheduled start FY-04 documentation of large runoff events. Table 7-1 8 Cottonwood Springs Scheduled start FY-04 indicates work priorities while Table 7-2 lists the current status of all water control manuals.

7-1 CHAPTER 7 WATER CONTROL MANUALS

TABLE 7-2 SCHEDULE FOR REVISION OF WATER CONTROL MANAULS FY 2004 – FY 2013

Date of Scheduled Type of Manual Completion Revision - Estimated or Last Date of Next Manual (M) Total Cost Dam/Reservoir Name Stream Owner District Revision Revision or Plan (P) $1000

Kelly Rd/Westerly Creek Westerly Creek CE NWO Dec 92 FY 2011 M 30

Papillion Creek Dams (4) Papillion Creek/Tribs CE NWO Oct 98 FY 2010 M 30

Chatfield South Platte River CE NWO Apr 73 FY 2004 M/P 110

Cherry Creek Cherry Creek CE NWO Oct 71 FY 2004 M/P 120

Bear Creek Bear Creek CE NWO Mar 77 FY 2004 M/P 90

Pipestem Pipestem Creek CE NWO Aug 86 FY 2004 M/P 60

Cold Brook Cold Brook CE NWO Aug 54 FY 2004 M 30

Cottonwood Springs Cottonwood Springs CE NWO Sep 73 FY 2004 M 20

Cedar Canyon Deadman's Gulch CE NWO Jan 71 FY 2005 M 20

Salt Creek Dams (10) Salt Creek/Tribs CE NWO Dec 78 FY 2006 M 40

Bowman-Haley N. Fork Grand River CE NWO Mar 87 FY 2007 M 30

Lake Pocasse Spring Creek CE NWO Jun 89 FY 2008 M 20

Lake Audubon Snake Creek CE NWO Dec 92 FY 2009 M 30

Bull Hook/Scott Coulee Bull Hook Creek CE NWO Mar 91 FY 2010 M 20

Canyon Ferry Missouri River BR NWO Apr 95 FY 2004 M 40

Jamestown James River BR NWO Nov 57 FY 2004 M/P 60

Pactola Rapid Creek BR NWO Feb 77 FY 2005 M 50

Boysen Wind River BR NWO Dec 66 FY 2006 M 50

Yellowtail Bighorn River BR NWO Jan 74 FY 2007 M 40

Clark Canyon Beaverhead River BR NWO Jun 76 FY 2008 M 40

Tiber Marias River BR NWO Dec 59 FY 2009 M/P 60

Heart Butte Heart River BR NWO Feb 51 FY 2010 M 30

Shadehill Grand River BR NWO Nov 51 FY 2011 M 30

Keyhole Belle Fourche River BR NWO Jun 69 FY 2012 M 30

Glendo North Platte River BR NWO Apr 70 FY 2013 M 40

7-2 CHAPTER 8 DATA COLLECTION PROGRAM AND PROCEDURES

The Omaha District data collection program is responsible for collecting tributary and reservoir data within the district boundaries. This chapter describes the manner in which the data is collected and who collects the data. In addition, a brief summary of other data that is being collected, including water quality and sedimentation, is included.

a. Water Control Data Collection.

i. Sources. Data from hydrologic gages for water control management are obtained from various sources including contract observers, project offices, National Weather Service, U.S. Geological Survey, Bureau of Reclamation, state offices and data collection platforms (DCPs) operated by the Omaha District. The National Weather Service (NWS) provides current weather conditions, one to five day forecasts, precipitation reports, river level data and special hydrologic forecasts including flood warnings. The Water Control and Water Quality section also obtains weather information from several commercial vendors. They include the National Weather Service, Meterologix – Storm Sentry Network, and various Internet web pages. Regional weather data and forecasts are provided by a satellite receiver to Storm Sentry and DTN workstations. Regional and National radar data can be looped to track heavy rainfall in the district on this device. The final source of weather information is from the Internet and the World Wide Web (WWW). There are many sites scattered throughout the United States and the world, which provide a variety of weather products at no cost. More detailed products require a subscription or payment. Internet sites include universities, the NWS and the commercial vendors of weather products. Products available range from raw data (i.e., precipitation, temperature) to upper air maps and forecast products containing "value-added" graphics.

ii. Storage. In February of 2002, the Water Control and Water Quality section moved to Corps Water Management Software (CWMS) as its primary data management system. Precipitation and stage data are also read into CWMS from the Papillion Creek alert flood warning system. CWMS was developed by the Hydrologic Engineering Center (HEC) and utilizes an Oracle database to store river, reservoir, and weather data.

iii. Data Collection Equipment. Remote site, satellite data transmissions are utilized for water control management. Satellite collection equipment being used by the district was purchased from Sutron Corporation and Design Analysis. The equipment is installed and maintained by Water Control and Water Quality section personnel and/or by contract. Currently there are 21 DCPs in Montana, 5 in Wyoming, 21 in Colorado, 14 in North Dakota, 28 in South Dakota, 47 in Nebraska, and 21 in Iowa for a total of 157 sites. The DCPs in the district LAN transmit real-time river and reservoir levels, precipitation, evaporation, wind, and water and air temperature data. This hourly data collected by these remote sensors is transmitted to two ground receiving sites located in Omaha, Nebraska (Corps of Engineers) and Boise, Idaho (Bureau of Reclamation). This information is currently transmitted via GOES-west and GOES-central satellites located at 135 degrees west longitude and 112 degrees west longitude, respectively.

8-1 CHAPTER 8 DATA COLLECTION PROGRAM AND PROCEDURES

The Water Control and Water Quality Section purchased a new ground receiving station called LRGS (Local Readout Ground Station). This is a newer version of the system already in use. Also, new DCPs are being purchased from Sutron and Design Analysis in preparation for the conversion to high data rate transmissions. The deadline for this conversion is December of 2013. With the addition of the LRGS the program called GOESIT used for decoding raw messages from DCPs was replaced with DECODES. DECODES simplifies and expedites the cumbersome process of adding or changing stream gages.

b. Cooperative Hydrologic Programs. Omaha District personnel complete the district’s stream gaging program with assistance from two other agencies. The two agencies activities are funded through two programs executed by the Water Control and Water Quality section. The Cooperative Stream Gaging Program (FC-33) provides financial support to seven United States Geological Survey (USGS) Districts for operation and maintenance of multiple stream gaging stations. The USGS districts are Colorado, Iowa, Montana, Nebraska, North Dakota, South Dakota, and Wyoming. Collection and publication of data such as stage, discharge, sediment, water quality and groundwater records are the primary functions of this program. The cooperative program also provides funding for DCP and telemark maintenance. The National Weather Service Reporting Network Program (FC-50) provides financial support for the collection of data from 30 gaging stations by six NWS district offices. Formerly operated by the Corps of Engineers, these stations are operated by the NWS and are required for reservoir regulation. The stations are in addition to the regular National Weather Service reporting stations. Table TABLE 8-1 8-1 shows the COST OF FY2002 NWS AND USGS COOPERATIVE PROGRAMS NWS Coop USGS Coop cost for these District Report Network Domsat AFOS Stream Gaging Total programs. Omaha $18,017 $15,400 $0 $1,261,960 $1,295,377

c. Water Quality. The Omaha District’s Water Quality Unit operates a water-quality monitoring program for Corps projects in the District. Water quality monitoring goals, objectives, and data collection approaches are defined in the document, “Strategic Plan and Guidance for Implementing the Omaha District’s Water Quality Management Program” (USACE, 2003). In general, water quality data collection consists of long-term fixed station monitoring, intensive surveys, special studies, watershed assessments, and investigative monitoring.

Long-term fixed station monitoring is intended to provide information that will allow the Omaha District to determine the status and trends of surface water quality at Corps projects. This type of sampling consists of systematically collecting samples at the same location over a long period of time (e.g., collecting monthly water samples at the same site for several years).

Intensive surveys are intended to provide more detailed information regarding the water quality conditions at Corps projects. They typically will include more sites and

8-2 CHAPTER 8 DATA COLLECTION PROGRAM AND PROCEDURES

parameters sampled over a shorter timeframe than long-term fixed station monitoring. Intensive surveys will provide the detailed water quality information needed to thoroughly understand water quality conditions at a project.

Special studies are conducted to address specific water quality information needs at Corps projects. Among other things, special water quality studies may be undertaken to collect the information needed to “scope-out” a specific water quality problem; calibrate and validate water quality models; design and engineer modifications at projects; or evaluate the effectiveness of specific implemented water quality enhancement measures.

The purpose of watershed assessments is to collect the information needed to identify and quantify sources and loadings of pollution being transported to targeted receiving waters from their watersheds. The Omaha District may conduct watershed assessments at a “scoping-level” to better understand possible pollution concerns impacting Corps projects. Information at this level will allow the Omaha District to interface with state and local entities regarding the identification of pollution concerns at Corps projects. Additionally, detailed watershed assessments may be conducted to definitively identify and quantify pollution sources, loadings, necessary loading reductions, contributing critical areas, and possible pollution control measures for implementation. The compilation and assessment of this information is typically facilitated through the utilization of watershed water quality models. The Omaha District’s involvement in detailed watershed assessments would normally be in a supporting role to state and local agencies that have the lead in developing a watershed management plan or total maximum daily load (TMDL) for a water body that involves a Corps project.

Investigative monitoring is typically initiated in response to an immediate need for water quality information. This may be in response to an operational situation at a Corps project, the occurrence of a significant pollution event, public complaint, or a report of a fish kill. Any Omaha District response to a pollution event or fish kill would need to be coordinated with the appropriate state and local agencies. The type of sampling that is done for investigative purposes is highly specific to the situation under investigation.

Water quality data collection conducted in 2003 at Omaha District projects by, or in cooperation with, the Water Quality Unit is summarized in Table 8-2.

8-3 CHAPTER 8 DATA COLLECTION PROGRAM AND PROCEDURES

TABLE 8-2 PROJECTS SAMPLED AND TYPES OF SAMPLING Type of Project Sampling* Samples Collected By** Mainstem Projects: · Gavins Point - Lewis and Clark Lake LTFS WQU - Lake Yankton LTFS WQU - Tailwaters LTFS WQU - Dam Releases LTFS WQU - Powerhouse LTFS Data-logger · Fort Randall - Lake Francis Case LTFS WQU - Dam Releases LTFS WQU - Tailwaters LTFS WQU · Big Bend - Lake Sharpe LTFS WQU, Project - Dam Releases LTFS WQU · Oahe - Lake Oahe LTFS WQU, Project - Dam Releases LTFS WQU · Garrison - Lake Sakakawea IS, SS WQU - Dam Releases LTFS WQU - Powerhouse LTFS Data-logger - Inflow IS, SS WQU · Fort Peck - Fort Peck Lake LTFS Project - Dam Releases LTFS Project - Powerhouse LTFS Data-logger Missouri River: · Fort Randall Dam to Lewis and Clark Lake LTFS WQU · Gavins Point Dam to Rulo, NE LTFS WQU Tributary Projects: · Tri-Lakes (CO) LTFS, SS Watershed Authority · Papillion Creek Lakes (NE) LTFS WQU · Salt Valley Lakes (NE) LTFS WQU · Bowman Haley Lake (ND) LTFS Contractor · Pipestem Lake (ND) LTFS WQU, Project · South Dakota Lakes (Cold Brook and Cottonwood Springs) LTFS WQU * LTFS = Long-Term Fixed Station. IS = Intensive Survey. SS = Special Study.

** WQU = Omaha District Water Quality Unit. Project = Corps Project personnel. Data-logger = Automatic in-place data logger serviced by the WQU. Watershed Authority = Local Watershed Authorities established for Cherry Creek, Chatfield, and Bear Lakes.

8-4 CHAPTER 8 DATA COLLECTION PROGRAM AND PROCEDURES

d. Sediment.

i Bed and Suspended Sediment Sampling. The Omaha District, under the Cooperative Stream Gaging Agreement with the United States Geological Survey (USGS), operates eight suspended sediment-sampling stations. Four of these stations are located on the Missouri River at Landusky, Montana; Sioux City, Iowa; Omaha, Nebraska; and Nebraska City, Nebraska.

ii Sedimentation Surveys. Sedimentation surveys were conducted at Gavin’s Point, Pipestem and the Moreau River.

8-5 CHAPTER 8 DATA COLLECTION PROGRAM AND PROCEDURES

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8-6 CHAPTER 9 OTHER WATER CONTROL ACTIVITIES

In addition to the information previously discussed, Omaha District Water Control routinely reports on other activities. This includes initiatives that it has and will undertake, Federal Energy Regulatory Commission application reviews and personnel issues. The following is a brief synopsis of these activities.

a. Water Control Initiatives.

i. Missouri River Region Water Control Data System Master Plan. The Water Control and Water Quality Section has been using the Corps Water Management System (CWMS) as its main production database since February 2001. Once the Kansas City Water Control office and the Missouri River Region Water Management office switch to CWMS, the three offices will make a gradual transition to a “corporate” CWMS Oracle database. This will allow each office to act as each other office’s Continuing Operations (COOP) Site.

ii. Geographical Information System (GIS). The Water Control and Water Quality section of Hydrologic Engineering Branch continues to become more involved in GIS. Geographic, hydrologic, hydraulic, and economic tools are being developed to help in decision making and briefing of other district elements and the Omaha District Commander.

b. Federal Energy Regulatory Commission (FERC) Applications. The Omaha District is responsible for review and comment on FERC applications submitted for projects within our geographic boundaries. Two FERC permits were reviewed and comments generated during the reporting period. Table 9-1 lists the requests.

TABLE 9-1 FERC PERMIT APPLICATIONS

Date Location Project Name Greybull Valley Irrigation District, Project October 31, 2002 On Roach Gulch and Greybull River in Park County, WY Nos. 12885-000, 12886-000, 12887-000 On the Clark Fork River in Bonner County, ID and Sanders December 26, 2002 Clark Fork Project County, MT Located mostly within the Stanislaus National Forest, on the January 7, 2003 middle fork, south fork, and mainstem of the Stanislaus River Spring Gap-Stanislaus Project in Tolumne and Calaveras Counties, CA Located partially within the Bridger-Teton National Forest, on January 28. 2003 Swift Creek Swift Creek, in Lincoln County, WY March 10, 2003 On the Clark Fork River in Missoula County, MT Milltown Hydroelectric Plant

April 3, 2003 On the Swan River in Flathead County, MT Bigfork Project On the Ouchita River in Garland and Hot Springs Counties, May 8, 2003 Carpenter-Remmel Hydroelectric Project AR

c. Personnel. The Water Control and Water Quality Section consists of Hydraulic Engineers, Hydrologic Engineering Technicians, an Ecologist, a Biologist, and student trainees. Table 9-2 shows a complete listing of the personnel (name, position, grade and telephone number), which were in the section during the reporting period.

9-1 APPENDIX A FALL RIVER BASIN

TABLE A-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT COLD BROOK COTTONWOOD NO SPRINGS GENERAL 1 Location of dam 1 mi. N of Hot Springs, SD 4.5 mi. W of Hot Springs, SD 2 River and mileage Cold Brook R M 1 Cottonwood Springs Creek 3 Drainage area in square miles 70.5 26 4 Reservoir length in miles 1.2 at elevation 3646.5 0.6 mi. at elevation 3875 5 Location of Damtender On site At Cold Brook Dam 6 Travel time to Missouri River - - 7 Max. discharge of record 8,400 cfs September 1938 - 8 Project cost (1) $1,571,000 $2,885,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 3675.0 3955.0 10 Length of dam - ft. 925 1,190 11 Height of dam - ft. 127 123 12 Stream bed – ft-msl 3,545 3,832 13 Abutment formation Sandstone, shale, limestone Minnekahta limestone 14 Type of fill Rolled earth Rolled earth 15 Fill quantity in cu. yds. 1,072,000 950,000 16 Date of closure September 1952 May 1969 17 Date of initial fill June 1963 (3584.7) - SPILLWAY 18 Discharge capacity - cfs (max. pool) 80,600 cfs at el. 3667.2 39,600 cfs at el. 3950.3 19 Crest elevation – ft-msl 3646.5 3936.0 20 Width - ft. 200 275 21 Gates, number, size, type Ungated sharp crested weir Ungated broad weir RESERVOIR ELEVATION AND AREA 22 Maximum pool 3667.2 279A 3950.0 257A 23 Top of flood control pool 3651.4 198A 3936.0 214A 24 Top of multipurpose pool 3585.0 36A 3875.0 41A 25 Top of inactive pool none 3868.0 30A STORAGE ZONES (Elev. - Capacity) 26 Surcharge 3651.4 - 3667.2 3,600AF 3936.0 - 3950.0 3,250AF 27 Flood control 3585.0 - 3651.4 6,680AF 3875.0 - 3936.0 7,730AF 28 Multipurpose 3548.0 - 3585.0 520AF 3868.0 - 3875.0 249AF 29 Inactive none 3832.0 - 3668.0 406AF 30 Gross Storage (Excl of surcharge) 7,200AF 8,385AF OUTLET WORKS 31 Number and size - conduits 1 - 6.67 ft. conduit 1 - 48 in. concrete 1 - 8 in. supply line 32 Conduit length - ft. 907 580 33 Disch capacity of conduit - cfs(at top of FC 1540 cfs at el. 3651.4 560 cfs at el. 3936.0 34 Pool) Ungated drop inlet - el. 3585 Ungated drop inlet - el. 3875 Gated outlets (No - size - invert. elev. of intake) 3 - 12 in. gate valves el. 3548 1 - 3 x 3 ft. gate - el. 3868 35 1 - 8 in. valve 36 Disch capacity of gated outlets - cfs Ungated outlets (No - size - invert elev. –ft-msl)

37 POWER INSTALLATION none none

(1) Cost as of 5-3-88

A - 1 APPENDIX A FALL RIVER BASIN

COLD BROOK DAM AND LAKE FALL RIVER BASIN, SOUTH DAKOTA 2002-2003 REGULATION

1. General. Releases from Cold Brook Reservoir are regulated to comply with state water law. Larive Lake Resort, located below the dam, holds a senior water right entitling it to the Cold Brook Reservoir inflow up to 1.1 cfs. Water has spilled from the project from November 1994 to the present. Table A-1 gives pertinent data for this reservoir.

The pool level and outflows from Cold Brook Reservoir are regulated by an outlet works with port openings at elevation 3585.0 ft-msl and a main crest at elevation 3600.0 ft- msl. The outlet works is uncontrolled, which means that there are no gates on the port openings or main crest to regulate flows once the pool level rises above the crest of the port openings. There are three low level gates in the outlet works, which each have a capacity of 20 cubic feet per second (cfs). These gates are normally closed, but can be opened to provide for lowering of the reservoir pool below elevation 3585.0 ft-msl. In spring of 2001 the downstream gage house was removed and 2 new 8-inch valves were installed on the 8-inch supply line to Larive Lake. One valve is used for controlling flows to Larive Lake and the other valve is used to divert flows into the stilling basin below the outlet works.

2. Operation Details. From the initial construction of Cold Brook Dam in the early 1950’s until 1994, the reservoir rarely filled to the top of the multipurpose pool, and outflows were at or near zero. Since 1994 groundwater conditions in the Black Hills have changed and there has been an increase in flow from springs in the area. This has resulted in pool levels at or slightly above the top of multipurpose pool and minor discharges below the project. For 8 years (1994-2001) the pool level fluctuated in the range of 3585 ft-msl to 3585.4 ft-msl, and outflows of up to 4 cfs spilling through the lower port openings of the intake structure except for periods of artificial drawdown. Since the new 8-inch valves were installed in 2001 the pool level has been maintained below the crest of the intake structure in the range of 3582 to 3584 ft-msl.

Traditionally the releases from Cold Brook Dam had been absorbed into the bed of the outflow channel and did not pose a problem to downstream residents. Beginning in December 1998, the outflow began to extend farther downstream on project property but still within the channel. After flow left the boundary of the Cold Brook Project, it extended into private land and a residential area in the northern part of Hot Springs, South Dakota. In about a one-quarter mile reach of private land below Cold Brook Dam, the channel has been completely filled in. Presently homes, trailers, and outbuildings are located in the historic channel area and flood plain of Cold Brook. Because of the lack of a channel to convey flood flows, a significant area is flooded with only a small release from the project. In addition to potential for property damage, the warning time for high releases is very low, resulting in the potential for loss of life in the residential area.

A-2 APPENDIX A FALL RIVER BASIN

The total inflow and outflow were at normal for the report period. This was a change for Cold Brook as conditions over the Black Hills in general have been very wet since 1993. Releases from Cold Brook Dam flow into Cold Brook. Cold Brook flows into the Fall River approximately one half mile downstream of Cold Brook Dam.

The temporary drawdown plan initiated on 28 June 1999 was continued in the water year 2003 with a slight modification. When it was first initiated the plan called for maintaining the Cold Brook Reservoir pool at a level five feet (elevation 3580 ft-msl) below the intake of the outlet works. The drawdown provided an additional 165 acre- feet of storage space in the reservoir to contain rainfall runoff. Because of impacts to recreation at the project, in water year 2003 the lake was drawn down to a level only 3 feet (elevation 3582 ft-msl) below the intake of the outlet works. This drawdown plan will be continued until studies are completed concerning the lack of downstream channel capacity.

Figures A-1 and A-2 detail historical and reporting period releases and pool elevations for Cold Brook.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 74 cfs Jul 14 62 19 cfs Jul 04 99 2nd 65 cfs Jul 08 61 13 cfs Apr 08 00 3rd 40 cfs May 19 82 12 cfs Jun 07 01

Pool-Date Highest 3585.63 Jun 20 99 2nd 3585.43 Jun 13 98 3rd 3585.41 Jul 16 95

b. Minimums of Record (since initial fill):

Pool-Date Lowest 3576.60 Oct 22 77 2nd 3576.80 Sep 14 81 3rd 3576.86 Oct 01 80

A - 3 APPENDIX A FALL RIVER BASIN

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 716 AF, 104% of normal 615 AF, 104% of normal

Peak Daily Inflow Peak Daily Outflow 3 cfs on Mar 18 1 cfs on Nov 06

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 3584.18, Mar 19 3581.96, Jun 16

FIGURE A-1 – COLD BROOK DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

A-4 APPENDIX A FALL RIVER BASIN

FIGURE A-2 – COLD BROOK DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

A - 5 APPENDIX A FALL RIVER BASIN

COTTONWOOD SPRINGS DAM AND LAKE FALL RIVER BASIN, SOUTH DAKOTA 2002-2003 REGULATION

1. General Operations. Cottonwood Springs Dam is located on Cottonwood Springs approximately 1/2 mile above its confluence with Hot Brook, a tributary of Fall River. The site is located 4.5 miles west of Hot Springs, Fall River County, South Dakota. The purpose for the project is to provide flood protection for Hot Springs, South Dakota and along the Fall River. Table A-1 gives pertinent data for this reservoir.

2. Operation Details. Figures A-3 and A-4 detail historical and reporting period releases and pool elevations for Cottonwood Reservoir. As shown in Figures A-3 and A-4, the reservoir continued a slow drop of 11 feet from a maximum pool elevation of 3872.70 ft-msl was achieved on 23 March 2000.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 18 cfs Aug 21 93 2nd 10 cfs Jun 21 95 -- No Outflow -- 3rd 8 cfs Feb 01 97

Pool Date Highest 3872.70 Mar 23 00 2nd 3871.61 Jul 31 99 3rd 3871.36 Aug 02 00

b. Minimums of Record (since initial fill):

Pool-Date Lowest 3832.40 Sep 30 89 2nd 3832.59 Aug 01 90 3rd 3832.90 Aug 14 93

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow (AF) 18 AF, 47% of normal -- No Outflow --

Peak Daily Inflow Peak Daily Outflow (CFS) 2 cfs on Jun 17 -- No Outflow --

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 3864.57, Aug 01 3861.71, Jul 31

A-6 APPENDIX A FALL RIVER BASIN

FIGURE A-3 – COTTONWOOD DAM POOL ELEVATIONS FOR REPORT PERIOD.

FIGURE A-4 – COTTONWOOD DAM HISTORICAL POOL ELEVATIONS.

A - 7 APPENDIX A FALL RIVER BASIN

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A-8 APPENDIX B GRAND RIVER BASIN

TABLE B-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT BOWMAN HALEY NO GENERAL 1 Location of dam 6 mi. W of Haley, ND 2 River and river mile N. Fk. Grand R M 100 3 Drainage area (sq. mi.) 446 4 Reservoir length (mi.) 2.5 mi. at elevation 2755 5 Location of Damtender Garrison Dam 6 Travel time to Missouri River 1 day to Shadehill Dam 7 Max. discharge of record 14,100 cfs April 1952 8 Project cost (1) $4,372,200 DAM AND EMBANKMENT 9 Top of dam – ft-msl 2794.0 10 Length of dam - ft. 5,730 11 Height of dam - ft. 79 12 Stream bed – ft-msl 2715 13 Abutment formation Ludlow, sandy clay, silty sand 14 Type of fill Rolled earth 15 Fill quantity in cu. yds. 1,750,000 16 Date of closure August 1966 17 Date of initial fill (base F.C.) March 1969 SPILLWAY 18 Discharge capacity - cfs 62,970 cfs at elevation 2789 19 Crest elevation – ft-msl 2,777 20 Width - ft. 650 21 Gates, number, size, type Ungated earth notch (2) RESERVOIR ELEVATION AND AREA 22 Maximum pool 2789.0 7916a 23 Top of flood control pool 2777.0 5131a 24 Top of multipurpose pool 2754.8 1732a 25 Top of inactive pool 2740.0 565a STORAGE ZONES (Elev. - Capacity) 26 Surcharge 2777.0 - 2789.0 77,085AF 27 Flood Control 2754.8 - 2777.0 72,717AF 28 Multipurpose 2740.0 - 2754.8 15,456AF 29 Inactive 2715.0 - 2740.0 3,309AF 30 Gross (top of flood control pool) 91,482AF

OUTLET WORKS 31 Number and size - conduits 1 - 10 ft. circular conduit

32 Conduit length - ft. 341 ft. Ungated Glory Hole-el 2754.8 33 Number - size - type gates 2 - 30 in. valves - el. 2740.0 1 - 30 in. interior gate valve 1 - 30 in. interior slide gate 34 Discharge capacity Glory Hole-3206cfs at el 2789 30 in. valve-140cfs at el 2755 35 POWER INSTALLATION none (1) Costs are as of 9-30-80. (2) Bowman Haley Spillway equipped with Fuse Plug (Crest Elevation 2780.7 ft-msl)

B - 1 APPENDIX B GRAND RIVER BASIN

BOWMAN-HALEY DAM AND LAKE GRAND RIVER BASIN, NORTH DAKOTA 2002-2003 REGULATION

1. General Operations. The pool level of Bowman-Haley Lake will be maintained from 1.0 to 2.0 feet below the top of conservation pool (2754.8 ft-msl) as a result of an informal agreement in 1994 between the Corps, the Natural Resource Conservation Service, the North Dakota Game and Fish Department, and the Bowman County Water Management District. This will be done by making releases through the Olzanski Tube or low level gate. Maintaining the pool at this level is being done in an attempt to reduce shoreline erosion, help establish riparian vegetation, and improve water quality by reducing turbidity from wave wash. In addition by making the releases from the lower strata of the reservoir, it is hoped that the overall quality of the water in the reservoir will be improved. Table B1 gives pertinent data for this reservoir.

2. Operational Details. The low level gate was closed on September 12, 2001. Due to the dry conditions in the basin the low level gate remained closed through the report period. Figures B-1 and B-2 detail historical and reporting period releases and pool elevations for Bowman Haley.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 5,310 cfs Mar 27 78 2,390 cfs Mar 28 78 2nd 2,135 cfs Jun 14 92 1,256 cfs May 15 95 3rd 2,081 cfs May 09 95 1,125 cfs Mar 14 72

Pool-Date Highest 2762.66 Mar 28 78 2nd 2758.77 May 14 95 3rd 2758.50 Mar 13 72

b. Minimums of Record (since initial fill):

Pool-Date Lowest 2747.57 Jun 12 92 2nd 2749.07 Apr 27 91 3rd 2749.54 Feb 26 03

B-2 APPENDIX B GRAND RIVER BASIN

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 3,529 AF, 16% of normal - No outflow -

Peak Daily Inflow Peak Daily Outflow 129 cfs on Mar 18 - No outflow -

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 2751.35, May 27 2749.54, Feb 26

FIGURE B-1 - BOWMAN-HALEY DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

B - 3 APPENDIX B GRAND RIVER BASIN

FIGURE B-2 – BOWMAN-HALEY DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

B-4 APPENDIX C JAMES RIVER BASIN

TABLE C-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT PIPESTEM NO GENERAL 1 Location of dam 3 mi. N W Jamestown, ND 2 River and river mile Pipestem Creek R M 3 3 Drainage area (sq. mi.) 594 4 Reservoir length (mi.) 5.5 at elevation 1442.4 5 Location of Damtender On site 6 Travel time to Missouri River 8 weeks 7 Max. discharge of record 6,080 cfs April 1969 8 Project cost (1) $9,277,500 DAM AND EMBANKMENT 9 Top of dam – ft-msl 1507.5 10 Length of dam - ft. 4,000 11 Height of dam - ft. 107.5 12 Stream bed – ft-msl 1,400 13 Abutment formation Sandy overburden-P. shale 14 Type of fill Rolled earth 15 Fill quantity in cu. yds. 1,990,000 16 Date of closure July 1973 17 Date of initial fill (base F.C.) May 1974 SPILLWAY 18 Discharge capacity - cfs 56,200 cfs at el. 1502.8 19 Crest elevation – ft-msl 1496.3 20 Width - ft. 1500 21 Gates, number, size, type Ungated earth channel RESERVOIR ELEVATION AND AREA 22 Maximum pool 1502.8 6000a 23 Top of flood control pool 1496.3 4728a 24 Top of multipurpose pool 1442.5 840a 25 Top of inactive pool 1415.0 5a STORAGE ZONES (Elev. - Capacity) 26 Surcharge 1496.3 - 1502.8 34,681AF 27 Flood Control 1442.5 - 1496.3 133,163AF 28 Multipurpose 1415.0 - 1442.5 8,944AF 29 Inactive 1400.0 - 1415.0 0AF 30 Gross (top of flood control pool) 142,107AF

OUTLET WORKS 31 Number and size - conduits 1 - 8 ft. circular conduit

32 Conduit length - ft. 675 ft. Ungated drop inlet-el. 1442.5 33 Number - size - type gates 2 - 4 x 7 ft. hydraulic slide 1 - 36 in valve, 1-3 x 3 ft slide

34 Discharge capacity 2,300 cfs at el. 1496.3 35 POWER INSTALLATION None (1) Costs are as of 9-30-80.

C - 1 APPENDIX C JAMES RIVER BASIN

PIPESTEM DAM AND LAKE PIPESTEM CREEK, JAMES RIVER BASIN, NORTH DAKOTA 2002-2003 REGULATION

1. General. Table C-1 gives pertinent data for this reservoir. Pipestem Reservoir is regulated as a system with Jamestown Reservoir, which is owned by the Bureau of Reclamation. A new water control plan was finalized at the end of 2002. This plan was the product of a study initiated in 1996. This new plan has been followed for the last several years. Details of this plan are contained in the study write-up “Jamestown and Pipestem Reservoirs Water Control Plan Review and Update, July, 2000”.

2. Operation Details. In summary, 2003 was the second below average runoff year since the wet years of 1993 to 2001 (see Figure C-1). It started as a year where the newly developed water control plan for Jamestown and Pipestem Reservoirs could be applied for a low flow year. During this type of year the new plan calls for a “low constant release” in order to (1) minimize the potential for unexpected flooding in South Dakota and (2) provide environmental and water supply benefits from low flow augmentation.

The report period began August 2002 continuing the dry conditions that were prevalent from the previous year. From that time on conditions were predominantly dry and the winter snowfall was near record low levels. As a result early spring forecasts where for very low runoff. There was unanimous consensus of agencies at the spring “James River Operations Meeting” held in Jamestown on April 10th, 2002 that the best plan of operation would be to follow the “low constant release” criteria and also to meet the June 1 target elevation at Jamestown Reservoir of 1431 ft, msl. Runoff was low at both projects until heavy rain upstream of both projects fell during the end of May. This rain caused Pipestem Reservoir to rise to elevation 1449.51, almost seven (7) feet into the flood control pool and Jamestown Reservoir rising to elevation 1432.47, almost one and a half (1.5) feet into the flood control zone (see Figures C-2 and C-3).

As a result of the rainfall in late May, the highest combined release was 270 cfs lasting less than one month. Releases were gradually cut back during the summer as drought conditions returned to the region (see Figure C-4). Releases for Pipestem were also adjusted to aid in the regulation of Jamestown Reservoir during the removal of the dam at Arrowwood NWR when inflows into Jamestown Reservoir were difficult to predict.

C-2 APPENDIX C JAMES RIVER BASIN

FIGURE C-1 – HISTORICAL ANNUAL FLOW VOLUME, JAMES RIVER GAGE AT JAMESTOWN, ND.

FIGURE C-2 – PIPESTEM DAM, POOL ELEVATION AND DISCHARGE.

C - 3 APPENDIX C JAMES RIVER BASIN

FIGURE C-3 – JAMESTOWN DAM, POOL ELEVATION AND DISCHARGE.

FIGURE C-4 – RELEASES FROM JAMESTOWN AND PIPESTEM DAMS.

C-4 APPENDIX C JAMES RIVER BASIN

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 4,374 cfs Jul 16 93 797 cfs Jun 16 01 2nd 3,380 cfs Apr 20 75 769 cfs May 23 97 3rd 3,231 cfs Apr 11 96 659 cfs Aug 05 99 Pool-Date Highest 1487.01 May 10 97 2nd 1479.54 May 22 95 3rd 1479.30 Jun 08 99

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1439.65 Feb 18 93 2nd 1439.97 Jan 01 77 3rd 1440.11 Jul 31 92

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 16,536 AF, 35% of normal 13,299 AF, 31% of normal

Peak Daily Inflow Peak Daily Outflow 274 cfs on May 19 128 cfs on May 23

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1449.51, May 24 1442.43, Oct 05

C - 5 APPENDIX C JAMES RIVER BASIN

FIGURE C-5 – PIPESTEM DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE C-6 – PIPESTEM DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

C-6 APPENDIX D MILK RIVER BASIN

TABLE D-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT BULL HOOK- NO SCOTT COULEE GENERAL 1 Location of dam 1 mi. S of Havre, MT 2 River and river mile Bull Hook Cr.-Scott Coulee 3 Drainage area (sq. mi.) 54 4 Reservoir length (mi.) Normally dry 5 Location of Damtender Ft. Peck Dam 6 Travel time to Missouri River - 7 Max. discharge of record - 8 Project cost (1) $1,837,200 DAM AND EMBANKMENT 9 Top of dam – ft-msl 2613.3 (BH) 2613.3 (SC) 10 Length of dam - ft. 1,900 (BH) 1500 (SC) 11 Height of dam - ft. 73 (BH) 53 (SC) 12 Stream bed – ft-msl 2,540 (BH) 2,560 (SC) 13 Abutment formation Glacial till, lean clay 14 Type of fill Rolled earth 15 Fill quantity in cu. yds. 1,300,000 16 Date of closure October 1955 17 Date of initial fill (base F.C.) - SPILLWAY *Notch in BH to 2583 18 Discharge capacity - cfs 25,200 cfs at elevation 2605 19 Crest elevation – ft-msl 2593.0 (BH)* 2586.0 (SC) 20 Width - ft. - 21 Gates, number, size, type Ungated earth channels RESERVOIR ELEVATION AND AREA 22 Maximum pool 2605.0 (BH & SC) 384a 23 Top of flood control pool 2593.0 (BH & SC) 283a 24 Top of multipurpose pool none 25 Top of inactive pool none STORAGE ZONES (Elev. - Capacity) Total - (BH & SC) 26 Surcharge 2593.0 - 2605.0 4000AF 27 Flood Control 2540.0 - 2593.0 6500AF 28 Multipurpose none 29 Inactive none 30 Gross (top of flood control pool) 6500AF

OUTLET WORKS 31 Number and size - conduits 1 - 30 in. RCP - Bull Hook 1 - 30 in. RCP - Scott Coulee 32 Conduit length - ft. 393 ft. - Bull Hook 286 ft. - Scott Coulee 33 Number - size - type gates 1 - 24 in. valve, Bull Hook 1 - 24 in. valve, Scott Coulee

34 Discharge capacity 123 cfs at 2593- Bull Hook 103 cfs at 2593- Scott Coulee 35 POWER INSTALLATION none (1) Costs as of 9-30-80.

D - 1 APPENDIX D MILK RIVER BASIN

BULL HOOK-SCOTT COULEE DAMS MILK RIVER BASIN, MONTANA 2002-2003 REGULATION

1. General Operations. Bull Hook and Scott Coulee Dams are both part of the Bull Hook Unit providing flood control for the city of Havre, Montana. Bull Hook and Scott Coulee Dams are both located south of Havre on Bull Hook and Scott Coulee Creeks, respectively.

Under normal circumstances, the conduit valves of both dams will be kept partially open to evacuate accumulated storage as expeditiously as possible to allow the dams to function as flood protection facilities if excess runoff occurs upstream. Valve openings are to be maintained that will allow only the minimal damages to occur in the City of Havre.

At times of high flows on the Milk River, it may be necessary to shut off releases in both dams to prevent flooding behind the Milk River levees. No reports of heavy inflow into Bull Hook-Scott Coulee Dams were made during the report period.

D-2 APPENDIX E MISSOURI RIVER BASIN

TABLE E-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT SNAKE CREEK LAKE AUDUBON SPRING CREEK (2) NO (1) LAKE POCASSE GENERAL 1 Location of dam 12 mi. NE of Garrison Dam Pollock, SD 2 River and river mile Snake Creek Spring Creek 3 Drainage area (sq. mi.) 250 660 4 Reservoir length (mi.) 5 Location of Damtender Garrison Dam Oahe Dam 6 Travel time to Missouri River - - 7 Max. discharge of record - 8 Project cost DAM AND EMBANKMENT 9 Top of dam – ft-msl 1865 1625.0 10 Length of dam - ft. 12,900 3,200 11 Height of dam - ft. 85 40 12 Stream bed – ft-msl 1780 1,585 13 Abutment formation 14 Type of fill Rolled Earth Rolled earth 15 Fill quantity in cu. yds. 16 Date of closure 1952 1961 17 Date of initial fill (base F.C.) September 1975 Between 1961 and 1964 SPILLWAY 18 Discharge capacity - cfs none 19 Crest elevation – ft-msl 1617.0 20 Width - ft. 72 21 Gates, number, size, type Ungated box culverts RESERVOIR ELEVATION AND AREA 22 Maximum pool 1850 20,620a 1625.0 2,560A 23 Top of flood control pool none none 24 Top of multipurpose pool 1847 18,780a 1617.0 1,520A 25 Top of inactive pool 1810 1,450a 1602.0 60A STORAGE ZONES (Elev. - Capacity) 26 Surcharge 1847 - 1850 59,130AF 1617.0 - 1625.0 15,000AF 27 Flood Control none 28 Multipurpose 1810 - 1847 323,690AF 1585.0 - 1617.0 11,000AF 29 Inactive 1780 - 1810 13,180AF 30 Gross (top of flood control pool) 396,000AF 11,000AF

OUTLET WORKS 31 Number and size - conduits 1 - 7 x 10 ft. reinforced concrete 1 - 5 ft. CMP conduit 32 Conduit length - ft.

33 Number - size - type gates 1 - 7 x 10 ft. sluice gate 5 x 5 ft sluice gate el. 1602 5 x 12 ft overflow roller gate el. 1609 34 Discharge capacity 2,300 cfs at 15 ft. head differential 35 POWER INSTALLATION none none (1) Subimpoundment of Garrison Reservoir – no authorized flood control. (2) Subimpoundment of Oahe Reservoir – no authorized flood control.

E - 1 APPENDIX E MISSOURI RIVER BASIN

SNAKE CREEK DAM AND LAKE AUDUBON LAKE SAKAKAWEA SUBIMPOUNDMENT MISSOURI RIVER BASIN, NORTH DAKOTA 2002-2003 REGULATION

1. General. Lake Audubon, a subimpoundment of Garrison Reservoir, is located 8 miles northeast of Riverdale, North Dakota. The embankment, known as "Snake Creek", has a crest elevation of 1865.0 ft-msl. With the original planned operating level of 1850.0 ft-msl, Lake Audubon would cover 20,600 acres and contains 396,000 acre- feet of water. The latest agreed on operating level of 1847.2 ft-msl would cover 19,095 acres and contains 346,419 AF of water. Table E-1 gives pertinent data for this subimpoundment.

2. Operation Details. The embankment was constructed with the primary purpose of relocating U.S. Highway 83 and the Soo Line Railroad across the Snake Creek Arm of the Garrison Diversion. In addition, during the planning stage it was decided to create a gated subimpoundment for the dual purpose of fish and wildlife enhancement, and the future diversion of water for anticipated irrigation. The pool level has been kept below elevation 1850.0 ft-msl because (1) all land surrounding the lake has not been acquired to maintain the 1850.0 ft-msl level and (2) that level (head) is not needed to supply water to the revised lower irrigation acreage. Garrison pool levels are limited to less than 15 feet above the Audubon pool for dam safety consideration. Most of the time, however, the Lake Audubon level is higher than the Garrison pool. If the latter condition exists, the Snake Creek pumping plant, operated by the Bureau, is used to transfer water from the Garrison Reservoir to Lake Audubon. Gravity flow discharge to or from Lake Audubon is conveyed by a gated conduit, which is 7 feet wide by 10 feet high with invert elevation at 1810.0 ft-msl. This gated conduit is normally closed.

Lake Audubon was operated in accordance with the 1987 Letter of Understanding between the Corps, the Bureau of Reclamation, Fish and Wildlife Service, and the North Dakota Game and Fish Department.

Figures E-1 and E-2 detail historical and reporting period releases and pool elevations for the Lake Sakakawea subimpoundments.

E-2 APPENDIX E MISSOURI RIVER BASIN

a. Maximums of Record:

Pool Date Highest 1848.61 Apr 26 76 2nd 1848.57 May 21 79

b. Minimums of Record (since initial fill):

Pool Date Lowest 1843.39 Mar 13 85 2nd 1843.50 Jan 27 92

c. Report Period (August 1, 2002 through July 31, 2003):

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1847.1, June 20 1845.0, Dec 01–Jan 27

E - 3 APPENDIX E MISSOURI RIVER BASIN

FIGURE E-1 – LAKE AUDUBON DAM POOL ELEVATIONS FOR REPORT PERIOD.

FIGURE E-2 – LAKE AUDUBON DAM HISTORICAL POOL ELEVATIONS.

E-4 APPENDIX E MISSOURI RIVER BASIN

SPRING CREEK DAM AND LAKE POCASSE (LAKE OAHE SUBIMPOUNDMENT) MISSOURI RIVER BASIN, SOUTH DAKOTA 2002-2003 REGULATION

1. General. Lake Pocasse is operated and administered as the Pocasse National Wildlife Refuge by the Department of the Interior's Fish and Wildlife Service under an agreement with the Corps of Engineers. The pool levels of Oahe Reservoir and Lake Pocasse are contiguous at or above elevation 1617.0 ft-msl, the top of the annual flood control and multiple use zones in Lake Oahe. The long-term plan of regulation is to maintain the Lake Pocasse level as high as possible. Every 4 to 5 years, an early summer drawdown to elevation 1614.0 ft-msl will assist in the re-establishment of shoreline vegetation and improved water quality. In addition, upon evaluation of hydrologic conditions prior to the spring runoff each year above Pocasse, decisions may be made to lower the pool to accommodate the appropriate runoff volumes. Table E-1 gives pertinent data for this subimpoundment.

2. Operation Details. Figures E-3 and E-4 detail historical and reporting period releases and pool elevations for the Lake Oahe subimpoundments.

a. Maximums of Record:

Pool-Date Highest 1625.00 Mar 23 87 2nd 1624.90 Mar 31 97 3rd 1622.98 Mar 18 95

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1602.69 Sep 22 90 2nd 1605.02 Oct 24 92 3rd 1606.55 Oct 29 91

c. Report Period (August 1, 2002 through July 31, 2003):

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1615.9, Jun 02 1614.3, Jul 31

E - 5 APPENDIX E MISSOURI RIVER BASIN

FIGURE E-3 – LAKE POCASSE DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE E-4 – LAKE POCASSE DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

E-6 APPENDIX F PAPILLION CREEK BASIN

TABLE F-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT DAM NO. 11 DAM NO. 16 NO (Glenn Cunningham Lake) (Standing Bear Lake) GENERAL 1 Location of dam 93rd State Street 132nd and Fort Street 2 River and mileage Knight Creek - Tributary Big Papio - 3 Drainage area in square miles 17.8 6 4 Reservoir length in miles 2.5 1.0 5 Location of Damtender Missouri River Project Office Missouri River Project Office 6 Travel time to Missouri River 5 - 10 Hours 5 - 10 Hours 7 Max. discharge of record - - 8 Project cost (1) $11,800,000 $4,500,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 1152 1130.0 10 Length of dam - ft. 1940 1460 11 Height of dam - ft. 67 70 12 Stream bed – ft-msl 1085 1060 13 Abutment formation Lean clay loess Lean clay loess 14 Type of fill Rolled earth Rolled earth 15 Fill quantity in cu. yds. 656,000 481,000 16 Date of closure 5 Aug 1974 3 Oct 1972 17 Date of initial fill 2 Sep 1977 24 Oct 1977 SPILLWAY 18 Discharge capacity - cfs (max. pool) 18,700 9,500 19 Crest elevation – ft-msl 1142 1121 20 Width - ft. 700 250 21 Gates, number, size, type Ungated earth channel Ungated earth channel RESERVOIR ELEVATION AND AREA (1987 data) (1989 data) 22 Maximum pool 1147 1170A 1127 390A 23 Top of flood control pool 1142 991A 1121 313A 24 Top of multipurpose pool 1121 377A 1104 125A 25 Top of inactive pool STORAGE ZONES (Elev. - Capacity) (1987 data) (1989 data) 26 Surcharge 1142 - 1147 5,405AF 1121 - 1127 2,110AF 27 Flood control 1121 - 1142 13,899AF 1104 - 1121 3,591AF 28 Multipurpose 1085 - 1121 3,262AF 1060 - 1104 1,285AF 29 Inactive 30 Gross Storage (Excl of surcharge) 17,161AF 4,876AF OUTLET WORKS 31 Number and size - conduits 1 - RCP - 54" Dia. 1 - RCP - 36" Dia.

32 Conduit length - ft. 680 736 33 Disch capacity of conduit - cfs(at top of FC Pool) 570 160 34 Gated outlets (No - size - invert. elev. of intake) 1 - 30" x 30" 1,100 1 - 24" x 36" 1,080.0

35 Disch capacity of gated outlets - cfs 90 90 36 Ungated outlets (No - size - invert elev. –ft-msl) 2 - 2.0' x 4.0' 1,121 2 - 1.0' x 2.5' 1,104.0 2 - 2.5' x 9.0' 1,127.5 2 - 2.0' x 6.0' 1,109.0 37 POWER INSTALLATION none none

(1) Cost as of 5-3-88

F - 1 APPENDIX F PAPILLION CREEK BASIN

TABLE F-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT DAM NO. 18 DAM NO. 20 NO (Zorinsky Lake) (Wehrspann Lake) GENERAL 1 Location of dam 156th and "F" Street 156th and Giles Road 2 River and mileage Boxelder Creek - Trib. South Branch Papio- 3 Drainage area in square miles 16.4 13.1 4 Reservoir length in miles 1.5 1.5 5 Location of Damtender Missouri River Project Office Missouri River Project Office 6 Travel time to Missouri River 5 - 10 Hours 5 - 10 Hours 7 Max. discharge of record - - 8 Project cost (1) $20,656,000 $14,934,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 1143.5 1131 10 Length of dam - ft. 1400 1810 11 Height of dam - ft. 64 59 12 Stream bed – ft-msl 1079.5 1069 13 Abutment formation Lean clay loess Lean clay loess 14 Type of fill Rolled earth Rolled earth 15 Fill quantity in cu. yds. 1,263,000 767,450 16 Date of closure 15 July 1984 21 Sep 1982 17 Date of initial fill 22 April 1992 26 May 1987 SPILLWAY 18 Discharge capacity - cfs (max. pool) 30,000 12,000 19 Crest elevation – ft-msl 1128.2 1120 20 Width - ft. 400 600 21 Gates, number, size, type Ungated earth channel Ungated earth channel RESERVOIR ELEVATION AND AREA (1985 data) (1984 data) 22 Maximum pool 1138.2 861A 1125.8 806A 23 Top of flood control pool 1128.2 599A 1113.1 489A 24 Top of multipurpose pool 1110.0 259A 1095.83 (2) 239A 25 Top of inactive pool STORAGE ZONES (Elev. - Capacity) (1985 data) (1984 data) 26 Surcharge 1128.2 - 1138.2 7,290AF 1113.1 - 1125.8 8,128AF 27 Flood control 1110.0 - 1128.2 7,649AF 1095.83 - 1113.1 6,119AF 28 Multipurpose 1060.5 - 1110.0 3,037AF 1069 - 1095.83 2,682AF 29 Inactive 30 Gross Storage (Excl of surcharge) 10,686AF 8,801AF OUTLET WORKS 31 Number and size - conduits 1 - RCP - 48" Dia. 1 - RCP - 48" Dia.

32 Conduit length - ft. 782 656 33 Disch capacity of conduit - cfs(at top of FC Pool) 460 490 34 Gated outlets (No - size - invert. elev. of intake) 1 - 30" x 30" 1,090.0 1 - 30" x 30" Dia. 1,077.0 1 - 6" diameter 1,104.25 1 - 6" diameter 1,090.0 35 Disch capacity of gated outlets - cfs 36 Ungated outlets (No - size - invert elev. –ft-msl) 140 140 2 - 1.5' x 3.5' 1,110.0 2 - 1.25' x 3.5' 1,095.83 2 - 3.15' x 8.0' 1,117.6 2 - 3.67' x 8.0' 1,103.4 37 POWER INSTALLATION none none

(1) Cost as of 5-3-88 (2) Based on a survey of July 1987 the elevation of the overflow lip was changed from 1096.0 ft-msl to 1095.83 ft-msl.

F-2 APPENDIX F PAPILLION CREEK BASIN

GLENN CUNNINGHAM DAM AND LAKE PAPILLION CREEK BASIN - NO. 11, NEBRASKA 2002-2003 REGULATION

1. General. There was no reservoir regulation activity during the reporting period. Therefore, the project was operated according to the water control manual for the duration of the reporting period. Table F-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation began the reporting period in the flood control zone. The pool elevation dropped to the conservation pool twice before the beginning of October but remained in the flood control zone for the remainder of the year. The reporting period had releases averaging in the 5 to 10 cfs range, with the elevation never getting above 1122 ft-msl. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures F-1 and F-2.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 931 cfs Aug 07 99 157 cfs Aug 08 99 1125.28 Aug 07 99 2nd 391 cfs Jul 05 98 152 cfs Jun 18 84 1124.40 Jun 17 84 3rd 362 cfs Jun 22 94 116 cfs Jun 16 80 1123.87 Jun 15 98

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1118.81 Aug 10 97* 2nd 1119.01 Jul 19 97 3rd 1119.49 Nov 15 89 *Due to two feet pool draw down for fish habitat work.

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 4,592 AF, 62% of Normal 3,548 AF, 58% of Normal

Peak Daily Inflow Peak Daily Outflow 66 cfs on Aug 23 25 cfs on May 15

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1122.02, May 15 1120.77, Aug 16

F - 3 APPENDIX F PAPILLION CREEK BASIN

FIGURE F-1 – PAPIO DAM 11 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE F-2 – PAPIO DAM 11 HISTORICAL POOL ELEVATOIONS AND RELEASES.

F-4 APPENDIX F PAPILLION CREEK BASIN

STANDING BEAR DAM AND LAKE PAPILLION CREEK BASIN - NO. 16, NEBRASKA 2002-2003 REGULATION

1. General. The project was operated according to the water control manual for the duration of the reporting period. Table F-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation started the report period in the conservation control zone but quickly entered the flood control zone in mid August. The pool elevation came back down to the conservation zone in September but reentered the flood control zone for two weeks in October. In early May spring rains forced the pool elevation back into the flood control zone until June. A request was made by the Papio NRD to lower the pool 7 inches to allow their contractor to clear the downstream channel. Releases began on 14 June and ended on 6 July. This was done to facilitate the Papio NRD’s request to clear the downstream channel. The balance of the reporting period had releases averaging in the 0 to 21 cfs range. The pool elevation remained in the conservation zone during the remainder of the reporting period. Historical as well as reporting period details are contained paragraphs 2a through 2c and Figures F-3 and F-4.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 266 cfs Jun 14 84 65 cfs Jun 16 84 1107.80 Jan 16 84 2nd 235 cfs Aug 09 87 57 cfs Aug 09 87 1107.68 Jul 06 98 3rd 211 cfs Jun 22 94 52 cfs May 22 82 1107.48 Jun 23 94

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1095.95 Feb 28 91 2nd 1097.58 Jun 06 90 3rd 1098.30 Feb 09 82

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 1,597 AF, 133% of Normal 1,176 AF, 163% of Normal

Peak Daily Inflow Peak Daily Outflow 87 cfs on Aug 23 21 cfs on May 05

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1105.22, May 05 1102.91, Feb 13

F - 5 APPENDIX F PAPILLION CREEK BASIN

FIGURE F-3 – PAPIO DAM 16 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE F-4 – PAPIO DAM 16 HISTORICAL POOL ELEVATIONS AND RELEASES.

F-6 APPENDIX F PAPILLION CREEK BASIN

ZORINSKY DAM AND LAKE PAPILLION CREEK BASIN - NO. 18, NEBRASKA 2002-2003 REGULATION

1. General. The project was operated according to the water control manual for the duration of the reporting period. Table F-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation started the reporting period in the conservation zone but climbed into the flood control zone for a week in August and again in October. In February the pool elevation went into the flood control zone again and remained there until July. This was due to spring rains. From the middle of July until the end of the reporting period, the pool remained in the conservation zone. Releases while the pool was in the flood control zone averaged between zero and 35 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures F-5 and F-6.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 561 cfs Jun 14 91 142 cfs Jul 25 93 1116.79 Jul 24 93 2nd 530 cfs Jul 24 93 113 cfs Aug 31 93 1114.75 Aug 30 93 3rd 423 cfs Aug 30 93 92 cfs Jun 26 00 1113.52 Jun 25 00

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1106.54 Aug 13 96 2nd 1107.08 Jul 27 98 3rd 1107.20 Jul 09 96

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 2,616 AF, 59% of Normal 1,904 AF, 53% of Normal

Peak Daily Inflow Peak Daily Outflow 120 cfs on Aug 23 46 cfs on Aug 24

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1111.55, Aug 23 1109.05, Sep 10

F - 7 APPENDIX F PAPILLION CREEK BASIN

FIGURE F-5 – PAPIO DAM 18 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE F-6 – PAPIO DAM 18 HISTORICAL POOL ELEVATIONS AND RELEASES.

F-8 APPENDIX F PAPILLION CREEK BASIN

WEHRSPANN DAM AND LAKE PAPILLION CREEK BASIN - NO. 20, NEBRASKA 2002-2003 REGULATION

1. Previous Years Operation. The project was operated according to the water control manual for the duration of the reporting period. Table F-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation for the reporting period was in the conservation zone and kept getting lower throughout the winter months. During the spring local rainfall held the pool level relatively steady around 1092.5. However, in June the pool began a steady decline to end the reporting period where it began at about 1991.5. Releases were at zero for the reporting period. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures F-7 and F-8.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 678 cfs Jun 28 93 124 cfs Jul 25 93 1103.20 Jul 24 93 2nd 515 cfs Aug 25 87 101 cfs Aug 31 93 1101.14 Aug 30 93 3rd 458 cfs Aug 29 93 77 cfs Aug 26 87 1099.50 Aug 25 87

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1085.42 May 02 90 2nd 1085.88 Feb 02 91 3rd 1086.94 Jun 01 89

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 952 AF, 44% of Normal No Outflow

Peak Daily Inflow Peak Daily Outflow 135 cfs on Aug 23 No Outflow

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1094.55, Aug 27 1090.82, Aug 16

F - 9 APPENDIX F PAPILLION CREEK BASIN

FIGURE F-7 – PAPIO DAM 20 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE F-8 – PAPIO DAM 20 HISTORICAL POOL ELEVATIONS AND RELEASES

F-10 APPENDIX G RAPID CREEK BASIN

TABLE G-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT CEDAR CANYON NO GENERAL 1 Location of dam 3.5 mi. W of Rapid City, SD 2 River and mileage Deadman's Gulch 3 Drainage area in square miles 0.4 4 Reservoir length in miles Normally dry 5 Location of Damtender Oahe Dam 6 Travel time to Missouri River - 7 Max. discharge of record 440 cfs August 1949 8 Project cost (1) $122,600 DAM AND EMBANKMENT 9 Top of dam – ft-msl 3554.0 10 Length of dam - ft. 1,320 11 Height of dam - ft. 42 12 Stream bed – ft-msl 3,512 13 Abutment formation Minnekahta limestone 14 Type of fill Rolled earth 15 Fill quantity in cu. yds. 150,000 16 Date of closure September 1959 17 Date of initial fill - SPILLWAY 18 Discharge capacity - cfs (max. pool) 1,400 cfs at elevation 3550.6 19 Crest elevation – ft-msl 3545.0 20 Width - ft. 60 21 Gates, number, size, type Ungated rock channel RESERVOIR ELEVATION AND AREA 22 Maximum pool 3550.6 15A 23 Top of flood control pool 3545.0 11A 24 Top of multipurpose pool none 25 Top of inactive pool 3526.0 2A STORAGE ZONES (Elev. - Capacity) 26 Surcharge 3545.0 - 3550.6 74AF 27 Flood control 3526.0 - 3545.0 123AF 28 Multipurpose none 29 Inactive 3512.0 - 3526.0 13AF 30 Gross Storage (Excl of surcharge) 136AF OUTLET WORKS 31 Number and size - conduits 1 - 24 in. C. M. P.

32 Conduit length - ft. 230 33 Disch capacity of conduit - cfs(at top of FC Pool) 49 cfs at el. 3545 34 Gated outlets (No - size - invert. elev. of intake) Ungated inlet - el. 3526

35 Disch capacity of gated outlets - cfs 36 Ungated outlets (No - size - invert elev. –ft-msl)

37 POWER INSTALLATION none

(1) Costs as of 5-3-88

G-1 APPENDIX G RAPID CREEK BASIN

CEDAR CANYON DAM (RED DALE GULCH) RAPID CREEK BASIN, SOUTH DAKOTA 2002-2003 REGULATION

1. General. Cedar Canyon Dam is located on the western outskirts of Rapid City, South Dakota. The dam is designed as a detention structure with no permanent storage. However, a small pool may sometimes exist in the dead storage below the invert of the outlet pipe. The dam collects runoff from approximately 261 acres. The outlet and spillway are uncontrolled. No water accumulated during the report period. Inflow was negligible and outflow was zero for the period. No flood control was achieved. Table G-1 gives pertinent data for this reservoir.

G-2 APPENDIX H SALT CREEK BASIN

TABLE H-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT DAM NO. 2 DAM NO. 4 DAM NO. 8 NO (Olive Creek Lake) (Blue Stem Lake) (Wagon Train Lake) GENERAL 1 Location of dam 1.5 mi. W of Sprague 2.5 mi. W of Sprague 1.5 mi. N of Holland 2 River and mileage S Trib. of Olive Br. RM 12 N. Trib. of Olive Br. RM 9.5 N. Trib. of Hickman Br. RM .8 3 Drainage area in square miles 8.2 16.6 15.6 4 Reservoir length in miles 1.2 1.6 1.8 5 Location of Damtender Missouri River Project Office Missouri River Project Office Missouri River Project Office 6 Travel time to Lincoln, NE 23 hrs. 13 hrs. 14 hrs. 7 Max. discharge of record 179 cfs July 1993 342 cfs October 1973 334 cfs July 1993 8 Max. pool elevation of record 1342.62 July 1993 1316.5 October 1973 1295.4 October 1973 9 Project cost (1) (1) (1) DAM AND EMBANKMENT 9 Top of dam – ft-msl (2) 1359.0 1332.7 1311.2 10 Length of dam - ft. 3020.0 2460.0 1650.0 11 Height of dam - ft. 45.0 57.0 52.0 12 Stream bed – ft-msl 1314.0 1277.0 1260.0 13 Abutment formation Clay - sand - silt Clay - sand Clay 14 Type of fill Rolled earth Rolled earth Rolled earth 15 Fill quantity in cu. yds. 312,000 471,000 376,000 16 Date of closure 20 Sept. 1963 12 Sept. 1962 24 Sept. 1962 17 Date of initial fill 30 Jun. 1965 6 Jul. 1963 24 Jun. 1963 SPILLWAY 18 Discharge capacity – cfs 15,875 at el. 1357.1 22,925 at el. 1331.7 23,210 at el. 1309.8 19 Crest elevation – ft-msl (2) 1350.0 1322.8 1301.2 20 Width - ft. 340.0 340.0 430.0 21 Gates, number, size, type Ungated earth channel Ungated earth channel Ungated earth channel RESERVOIR ELEV. AND AREA (1993 data) (1993 data) (1987 data) 22 Maximum pool 1357.1 459A 1331.7 938A 1309.8 908A 23 Top of flood control pool 1350.0 359A 1322.5 646A 1302.0 648A 24 Top of joint use pool none none none 25 Top of conservation pool 1335.0 162A 1307.4 309A 1287.8 277A 26 Top of sediment pool 1335.0 162A 1306.1 282A 1284.6 200A STORAGE ZONES (Elev. - Capacity) (1993 data) (1993 data) (1987 data) 27 Surcharge zone 1350.0 - 1357.1 2,911AF 1322.5 - 1331.7 7,229AF 1302.0 - 1309.8 5,972AF 28 Exclusive flood control zone 1335.0 - 1350.0 3,857AF 1307.4 - 1322.5 7,129AF 1287.8 - 1302.0 6,676AF 29 Conservation zone none 1306.1 - 1307.4 385AF 1284.6 - 1287.8 755AF 30 Sediment pool zone 1314.0 -1335.0 1,100AF 1277.0 - 1305.1 2,146AF 1260.0 - 1284.6 1,298AF 31 Gross Storage (Excl of surcharge) 4,957AF 9,660AF 8,929AF OUTLET WORKS 32 Number and size – conduits 1 - CMP - 48" Dia. 1 - CMP - 60" Dia. 1 - CMP - 60" Dia. With 30" RCP lining With 42" RCP lining With 42" RCP lining 33 Conduit length - ft. 280 313 299 34 Gated outlets (No. - size - type - invert. 1 - 36" x 36" Lift gate- 1330.0 1 - 36" x 36" Lift gate- 1303.0 1 - 36" x 36" Lift gate- 1283.5 elev.) 35 Ungated outlets (Openings - size - elev.) 2 - 24" x 72" - 1340.9 2 - 30" x 96" - 1313.5 2 - 30" x 96" - 1292.4 2 - 12" x 30" - 1335.0 2 - 12" x 54" - 1307.4 2 - 12" x 54" - 1287.8 36 Disch. capacity - cfs (At base of EFC 85 @ 1335.0 85 @ 1307.4 85 @ 1287.8 zone) 37 POWER INSTALLATION none none none

(1) Total project financial cost including all dams = $12,075,000 (Costs are as of 9-30-80) (2) Top of dam and spillway crest elevation changed per 1997 Freeboard Analysis Surveys.

H-1 APPENDIX H SALT CREEK BASIN

TABLE H-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT DAM NO. 9 DAM NO. 10 DAM NO. 12 NO (Stagecoach Lake) (Yankee Hill Lake) (Conestoga Lake) GENERAL 1 Location of dam 1 mi. S of Hickman 3.5 mi. N of Denton 1.5 mi. N of Denton 2 River and mileage S. Trib. of Hickman Br. RM 1 Cardwell Br. RM 4 Holmes Cr. RM 1 3 Drainage area in square miles 9.7 8.4 15.1 4 Reservoir length in miles 1.4 0.7 1.4 5 Location of Damtender Missouri River Project Office Missouri River Project Office Missouri River Project Office 6 Travel time to Lincoln, NE 8 hrs. 3 hrs. 8 hrs. 7 Max. discharge of record 190 cfs October 1973 145 cfs October 1973 185 cfs March 1987 8 Max. pool elevation of record 1279.0 October 1973 1252.3 October 1973 1241.1 March 1987 9 Project cost (1) (1) (1) DAM AND EMBANKMENT 9 Top of dam – ft-msl (2) 1294.2 1270.2 1260.2 10 Length of dam - ft. 2250.0 3100.0 3000.0 11 Height of dam - ft. 48.0 52.0 63.0 12 Stream bed – ft-msl 1246.0 1218.0 1197.0 13 Abutment formation Clay - sand Clay - sand Clay - sand 14 Type of fill Rolled earth Rolled earth Rolled earth 15 Fill quantity in cu. yds. 374,000 502,000 658,000 16 Date of closure 27 Aug. 1963 5 Oct. 1965 24 Sept. 1963 17 Date of initial fill 25 May 1965 10 Jun. 1967 May 1965 SPILLWAY 18 Discharge capacity – cfs 17,565 at el. 1291.6 12,100 at el. 1267.8 27,220 at el. 1258.2 19 Crest elevation – ft-msl (2) 1284.9 1262.5 1251.9 20 Width - ft. 430.0 400.0 750.0 21 Gates, number, size, type Ungated earth channel Ungated earth channel Ungated earth channel RESERVOIR ELEV. AND AREA (1990 data) (1994 data) (1988 data) 22 Maximum pool 1291.6 621A 1267.8 627A 1258.2 733A 23 Top of flood control pool 1285.0 464A 1262.0 495A 1252.0 601A 24 Top of joint use pool none none none 25 Top of conservation pool 1271.1 195A 1244.9 211A 1232.9 217A 26 Top of sediment pool 1271.1 195A 1241.9 170A 1232.9 217A STORAGE ZONES (Elev. - Capacity) (1990 data) (1994 data) (1988 data) 27 Surcharge zone 1285.0 - 1291.6 3,578AF 1262.0 - 1267.8 3,225AF 1252.0 - 1258.2 4,141AF 28 Exclusive flood control zone 1271.1 - 1285.0 4,413AF 1244.9 - 1262.0 5,841AF 1232.9 - 1252.0 7,655AF 29 Conservation zone none 1241.9 - 1244.9 570AF none 30 Sediment pool zone 1246.0 - 1271.1 1,451AF 1218.0 - 1241.9 1,057AF 1197.0 - 1232.9 1,912AF 31 Gross Storage (Excl of surcharge) 5,864AF 7,468AF 9,567AF OUTLET WORKS 32 Number and size – conduits 1 - CMP - 48" Dia. 1 - CMP - 42" Dia. 1 - CMP - 60" Dia. With 30" RCP lining With 30" RCP lining With 42" RCP lining 33 Conduit length - ft. 280 300 318 34 Gated outlets (No. - size - type - 1 - 36" x 36" Lift gate- 1261.0 1 - 36" x 36" Lift gate- 1237.0 1 - 36" x 36" Lift gate- 1228.0 invert. elev.) 35 Ungated outlets (Openings - size - 2 - 24" x 72" - 1277.1 2 - 18" x 63" - 1250.0 2 - 30" x 96" - 1242.3 elev.) 2 - 12" x 30" - 1271.1 2 - 12" x 30" - 1244.9 2 - 12" x 54" - 1232.9 36 Disch. capacity - cfs (At base of EFC 85 @ 1271.1 110 @ 1244.9 85 @ 1232.9 zone) 37 POWER INSTALLATION none none none

(1) Total project financial cost including all dams = $12,075,000 (Costs are as of 9-30-80) (2) Top of dam and spillway crest elevation changed per 1997 Freeboard Analysis Surveys.

H-2 APPENDIX H SALT CREEK BASIN

TABLE H-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT DAM NO. 13 DAM NO. 14 NO (Twin Lakes) (Pawnee Lake) GENERAL 1 Location of dam 2 mi. NW of Pleasantdale 2 mi. NW of Emerald 2 River and mileage Middle Cr. RM 12.8 N Middle Cr. RM 1 3 Drainage area in square miles 11.0 35.9 4 Reservoir length in miles 1.5 3.0 5 Location of Damtender Missouri River Project Office Missouri River Project Office 6 Travel time to Lincoln, NE 13 hours 7 hrs. 7 Max. discharge of record 168 cfs June 1983 420 cfs July 1993 8 Max. pool elevation of record 1346.9 June 1983 1249.1 July 1993 9 Project cost (1) (1) DAM AND EMBANKMENT 9 Top of dam – ft-msl (2) 1363.6 1270.6 10 Length of dam - ft. 2075.0 5000.0 11 Height of dam - ft. 58.0 65.0 12 Stream bed – ft-msl 1306.0 1206.0 13 Abutment formation Clay - sand - silt Clay - sand 14 Type of fill Rolled earth Rolled earth 15 Fill quantity in cu. yds. 610,000 870,000 16 Date of closure 26 Sept. 1965 16 Jul. 1964 17 Date of initial fill 18 Mar. 1969 21 Jun. 1967 SPILLWAY 18 Discharge capacity - cfs 25,200 at el. 1361.6 19,875 at el. 1269.1 19 Crest elevation – ft-msl (2) 1354.9 1263.4 20 Width - ft. 400.0 700.0 21 Gates, number, size, type Ungated earth channel Ungated earth channel RESERVOIR ELEV. AND AREA (1994 data) (1981 data) 22 Maximum pool 1361.6 636A 1269.1 1679A 23 Top of flood control pool 1355.0 497A 1263.5 1403A 24 Top of joint use pool none none 25 Top of conservation pool 1341.0 236A 1244.3 739A 26 Top of sediment pool 1337.4 177A 1244.3 739A STORAGE ZONES (Elev. - Capacity) (1994 data) (1981 data) 27 Surcharge zone 1355.0 - 1361.6 3,728AF 1263.5 - 1269.1 8,575AF 28 Exclusive flood control zone 1341.0 - 1355.0 5,021AF 1244.3 - 1263.5 20,299AF 29 Conservation zone 1337.4 - 1341.0 747AF none 30 Sediment pool zone 1306.0 - 1337.4 1,414AF 1206.0 - 1244.3 7,813AF 31 Gross Storage (Excl of surcharge) 7,182AF 28,112AF OUTLET WORKS 32 Number and size - conduits 1 - CMP - 42" Dia. 1 - CMP - 60" Dia. With 30" RCP lining With 42" RCP lining 33 Conduit length - ft. 335 382 34 Gated outlets (No. - size - type - invert. 1 - 42" x 54" Lift gate- 1333.0 1 - 42" x 60" Lift gate- 1236.0 elev.) 35 Ungated outlets (Openings - size - elev.) 2 - 24" x 63" - 1341.0 2 - 34" x 120" - 1244.3 - - 36 Disch. capacity - cfs (At base of EFC zone) 190 @ 1341.0 210 @ 1244.3 37 POWER INSTALLATION none none

(1) Total project financial cost including all dams = $12,075,000 (Costs are as of 9-30-80) (2) Top of dam and spillway crest elevation changed per 1997 Freeboard Analysis Surveys.

H-3 APPENDIX H SALT CREEK BASIN

TABLE H-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT DAM NO. 17 DAM NO. 18 NO (Holmes Lake) (Branched Oak Lake) GENERAL 1 Location of dam SE edge of Lincoln 4 mi. W of Raymond 2 River and mileage Antelope Cr. RM 6.1 Oak Cr. RM 17.3 3 Drainage area in square miles 5.4 88.7 4 Reservoir length in miles 0.7 3.7 5 Location of Damtender Missouri River Project Office Missouri River Project Office 6 Travel time to Lincoln, NE 3 hrs. 6 hrs. 7 Max. discharge of record 187 cfs June 1983 774 cfs July 1993 8 Max. pool elevation of record 1249.97 July 1993 1287.9 August 1987 9 Project cost (1) (1) DAM AND EMBANKMENT 9 Top of dam – ft-msl (2) 1271.3 1318.2 10 Length of dam - ft. 7700.0 5200.0 11 Height of dam - ft. 55.0 70.0 12 Stream bed – ft-msl 1218.0 1250.0 13 Abutment formation Clay - sand Clay - sand - silt 14 Type of fill Rolled earth Rolled earth 15 Fill quantity in cu. yds. 900,000 246,000 16 Date of closure 17 Sept. 1962 21 Aug. 1967 17 Date of initial fill 2 Jun. 1965 18 Jan. 1973 SPILLWAY 18 Discharge capacity - cfs 800 at el. 1269.7 7,825 at el. 1317.5 19 Crest elevation – ft-msl (2) 1267.2 1311.6 20 Width - ft. 50.0 200.0 21 Gates, number, size, type Ungated earth channel Ungated earth channel RESERVOIR ELEV. AND AREA (1993 data) (1991 data) 22 Maximum pool 1269.7 423A 1317.3 4224A 23 Top of flood control pool 1266.0 381A 1311.0 3673A 24 Top of joint use pool none none 25 Top of conservation pool 1242.4 123A 1284.0 1847A 26 Top of sediment pool 1240.0 99A 1275.7 1225A STORAGE ZONES (Elev. - Capacity) (1993 data) (1991 data) 27 Surcharge zone 1266.0 - 1269.7 1,490AF 1311.0 - 1317.3 24,886AF 28 Exclusive flood control zone 1242.4 - 1266.0 5,845AF 1284.0 - 1311.0 71,686AF 29 Conservation zone 1240.0 - 1242.4 245AF 1275.7 - 1284.0 12,724AF 30 Sediment pool zone 1218.0 - 1240.0 538AF 1250.0 - 1275.7 12,364AF 31 Gross Storage (Excl of surcharge) 6,628AF 96,774AF OUTLET WORKS 32 Number and size - conduits 1 - CMP - 60" Dia. 1 - CMP - concrete With 42" RCP lining Lined - 72" Dia. 33 Conduit length - ft. 320 370 34 Gated outlets (No. - size - type - invert. 1 - 36" x 36" Lift gate- 1239.0 1 - 48" x 72" Lift gate - 1274.0 35 elev.) Ungated outlets (Openings - size - elev.) 2 - 30" x 96" - 1249.0 1 - 10" Dia. slide gate- 1276.3 36 2 - 12" x 36" - 1242.5 2 - 42" x 144" - 1283.95 Disch. capacity - cfs (At base of EFC zone) 85 @ 1242.4 300 @ 1284.0 37 POWER INSTALLATION none none

(1) Total project financial cost including all dams = $12,075,000 (Costs are as of 9-30-80) (2) Top of dam and spillway crest elevation changed per 1997 Freeboard Analysis Surveys.

H-4 APPENDIX H SALT CREEK BASIN

OLIVE CREEK DAM AND LAKE SALT CREEK BASIN - NO. 2, NEBRASKA 2002-2003 REGULATION

1. General. There was no reservoir regulation activity during the reporting period. The project was operated according to the water control manual for the duration of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. Salt Creek No. 02 operated in the conservation pool for the reporting period. Once pool levels reached 1330 ft-msl, in mid-May, releases began again. Releases ranged from 3 to 4 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-1 and H-2.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 764 cfs Jun 12 84 179 cfs Jul 25 93 1342.62 Jul 24 93 2nd 749 cfs Oct 10 73 176 cfs Oct 12 73 1342.60 Oct 11 73 3rd 730 cfs Oct 11 86 171 cfs Jun 13 84 1342.10 Jun 12 84

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1324.32 Dec 01 99* 2nd 1324.32 Aug 01 00* 3rd 1325.32 Jul 29 99 *Due to lake renovation and habitat enhancement.

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 444 AF, 18% of Normal 250 AF, 13% of Normal

Peak Daily Inflow Peak Daily Outflow 14 cfs on May 19 4 cfs on Aug 01

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1330.45, Aug 01 1329.34, Apr 28

H-5 APPENDIX H SALT CREEK BASIN

FIGURE H-1 – SALT CREEK DAM 2 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-2 – SALT CREEK DAM 2 HISTORICAL POOL ELEVATIONS AND RELEASES. H-6 APPENDIX H SALT CREEK BASIN

BLUESTEM DAM AND LAKE SALT CREEK BASIN - NO. 4, NEBRASKA 2002-2003 REGULATION

1. General. There was no reservoir regulation activity during the reporting period. The project was operated according to the water control manual for the duration of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation entered the report period in the conservation zone. The pool rose in early October to the flood control zone and didn’t fall until early January. In late April spring rains caused the pool rise to the flood control zone again and remained there until mid July. Releases ranged from zero to 83 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-3 and H-4.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 1,477 cfs Oct 10 73 342 cfs Oct 12 73 1316.5 Oct 11 73 2nd 996 cfs May 09 96 198 cfs Jun 14 84 1314.5 Jun 13 84 3rd 932 cfs Jul 24 93 195 cfs Jul 26 93 1314.23 Jul 25 93

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1299.11 Oct 28 91 2nd 1299.90 Sep 01 77 3rd 1300.10 Jul 26 77

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 5,536 AF, 114% of Normal 4,570 AF, 123% of Normal

Peak Daily Inflow Peak Daily Outflow 243 cfs on Jun 10 83 cfs on Jun 13

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1309.67, Jun 12 1306.47, Aug 19

H-7 APPENDIX H SALT CREEK BASIN

FIGURE H-3 – SALT CREEK DAM 4 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-4 – SALT CREEK DAM 4 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-8 APPENDIX H SALT CREEK BASIN

WAGON TRAIN DAM AND LAKE SALT CREEK BASIN - NO. 8, NEBRASKA 2002-2003 REGULATION

1. General. Lowering of Wagon Train Lake began in September 1997. The Nebraska Game and Parks Commission (NGPC) renovated the lake and developed shoreline protection, sediment detention and island habitat during the winter of 1998-1999. The lake was lowered to approximately 1275.0 ft-msl. A stop-log structure was also installed on the intake to allow the NGPC to control lake levels for fisheries activities. In June of 2000, the Nebraska Game and Parks Commission completed the lake renovation and the pool was allowed to rise. The reservoir was operated according to the water control manual for the balance of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation entered the report period in the conservation zone. A release of 18 cfs was made in March to get the reservoir 6 inches below the ungated opening for the periodic inspection. The gate was not closed until early May. The pool rose in mid June for a week to the flood control zone and again five days later. Both rises were caused by two inch rains. Releases ranged from 0 cfs on 49 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-5 and H-6.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 1,199 cfs Oct 10 73 334 cfs Jul 25 93 1295.4 Oct 11 73 2nd 1,037 cfs Jul 24 93 329 cfs Oct 12 73 1294.61 Jul 25 93 3rd 1,027 cfs Oct 11 86 175 cfs Oct 12 86 1293.2 Jun 13 84 Oct 11 86

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1273.10 Apr 05 00* 2nd 1275.00 Feb 20 01* 3rd 1275.48 Apr 04 99* *Due to lake renovation and habitat enhancement.

c. Report Period (August 1, 2002 through July 31, 2003): Total Inflow Total Outflow 2,225 AF, 44% of Normal 1,172 AF, 29% of Normal

Peak Daily Inflow Peak Daily Outflow 211 cfs on Jun 10 49 cfs on Jun 13

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1289.25, Jun 12 1284.28, Aug 20

H-9 APPENDIX H SALT CREEK BASIN

FIGURE H-5 – SALT CREEK DAM 8 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-6 – SALT CREEK DAM 8 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-10 APPENDIX H SALT CREEK BASIN

STAGECOACH DAM AND LAKE SALT CREEK BASIN - NO. 9, NEBRASKA 2002-2003 REGULATION

1. General. There was reservoir regulation activity during the month of March. This resulted in a release of 18 cfs for 5 days. Therefore, the project was operated according to the water control manual for the duration of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation started the reporting period in the conservation zone but entered the flood control zone periodically due to locally small rains. The pool was lowered to 6 inches below the ungated outlet for the periodic inspection in March. This resulted in a release of 18 cfs for 5 days. In June and then again in July significant spring rains forced the pool 2 and 2.5 feet into the flood control zone respectively. This resulted in releases as high as 64 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-7 and H-8.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 958 cfs Oct 10 73 190 cfs Oct 12 73 1279.00 Oct 11 73 2nd 829 cfs Oct 11 86 155 cfs Jul 25 93 1278.15 Jul 24 93 3rd 776 cfs Jul 24 93 127 cfs May 10 96 1277.65 May 09 96

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1259.60 Oct 31 91 2nd 1260.50 Aug 09 76 3rd 1260.86 Oct 19 90

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 2,386 AF , 74% of Normal 1,896 AF, 75% of Normal

Peak Daily Inflow Peak Daily Outflow 286 cfs on Jun 23 64 cfs on Jun 24

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1273.61, Jun 23 1269.79, Mar 11

H-11 APPENDIX H SALT CREEK BASIN

FIGURE H-7 – SALT CREEK DAM 9 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-8 – SALT CREEK DAM 9 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-12 APPENDIX H SALT CREEK BASIN

YANKEE HILL DAM AND LAKE SALT CREEK BASIN - NO. 10, NEBRASKA 2002-2003 REGULATION

1. General. The pool was drawn down beginning in April 2002 and continuing through the end of the reporting period, when the lake level reached the low level invert and was then siphoned down to the elevation of 1233.32. The draw down was performed at the request of the Nebraska Game and Parks Commission to permit lake rehabilitation. The gate at Salt Creek Dam No. 10 will remain open until lake rehabilitation is complete. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation began and ended the reporting period in the conservation zone. The maximum discharge for the year was 20 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-9 and H-10.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 690 cfs Oct 10 73 145 cfs Oct 12 73 1252.30 Oct 11 73 2nd 609 cfs Jul 24 93 133 cfs Jul 25 93 1251.21 Jul 24 93 3rd 575 cfs Sep 08 89 114 cfs Jun 14 84 1250.70 Jun 13 84

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1233.32 Jul 31, 2003* 2nd 1236.67 Jul 31, 2002* 3rd 1238.90 Aug 08 77 *Due to lake renovation and habitat enhancement.

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 1,214 AF, 22% of Normal 1,222 AF, 25% of Normal

Peak Daily Inflow Peak Daily Outflow 104 cfs on Jun 10 20 cfs on Jun 12

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1237.98, Oct 04 1233.32, Jul 31

H-13 APPENDIX H SALT CREEK BASIN

FIGURE H-9 – SALT CREEK DAM 10 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-10 – SALT CREEK DAM 10 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-14 APPENDIX H SALT CREEK BASIN

CONESTOGA DAM AND LAKE SALT CREEK BASIN - NO. 12, NEBRASKA 2002-2003 REGULATION

1. General. There was no reservoir regulation activity during the reporting period. The project was operated according to the water control manual for the duration of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation entered the reporting period in the conservation zone and did not rise to the flood control zone until mid June. This lasted until mid July and was caused by local rains. The maximum discharge for the reporting period was 33 cfs during June. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-11 and H-12.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 907 cfs Mar 23 87 185 cfs Mar 25 87 1241.10 Mar 24 87 2nd 899 cfs Jul 24 93 180 cfs Jul 25 93 1240.64 Jul 24 93 3rd 693 cfs May 18 74 152 cfs Jun 16 82 1239.60 Oct 11 73

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1228.40 Aug 28 77 2nd 1228.60 Jul 31 77 3rd 1229.04 Jul 04 92

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 1,353 AF, 26% of Normal 421 AF, 9% of Normal

Peak Daily Inflow Peak Daily Outflow 213 cfs on Jun 12 33 cfs on Jun 13

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1233.84, Jun 13 1230.09, Sep 30

H-15 APPENDIX H SALT CREEK BASIN

FIGURE H-11 – SALT CREEK DAM 12 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-12 – SALT CREEK DAM 12 HISTORICAL POOL ELEVATION AND RELEASES.

H-16 APPENDIX H SALT CREEK BASIN

TWIN LAKES DAM AND LAKE SALT CREEK BASIN - NO. 13, NEBRASKA 2002-2003 REGULATION

1. General. There was no reservoir regulation activity during the reporting period. The project was operated according to the water control manual for the duration of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation entered the report period in the conservation zone and remained there until spring rains caused a rise twice in May and again in June. Releases from zero to 100 cfs for the reporting period. Historical as well as reporting period details are contained paragraphs 2a through 2c and Figures H-13 and H-14.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 632 cfs Jul 13 93 168 cfs Jun 30 83 1346.90 Jun 29 83 2nd 539 cfs Mar 23 87 167 cfs Mar 24 87 1346.00 Mar 23 87 3rd 539 cfs Jun 14 98 165 cfs Jul 27 93 1345.55 Jul 26 93

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1332.13 Oct 31 91 2nd 1332.15 Aug 18 89 3rd 1332.51 Jul 29 89

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 2,815 AF, 70% of Normal 1722 AF, 54% of Normal

Peak Daily Inflow Peak Daily Outflow 211 cfs on Jun 10 100 cfs on Jun 13

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1342.62, Jun 12 1338.45, Aug 16

H-17 APPENDIX H SALT CREEK BASIN

FIGURE H-13 – SALT CREEK DAM 13 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-14 – SALT CREEK DAM 13 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-18 APPENDIX H SALT CREEK BASIN

PAWNEE DAM AND LAKE SALT CREEK BASIN - NO. 14, NEBRASKA 2002-2003 REGULATION

1. General. The project was operated according to the water control manual for the duration of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. Elevations entered the reporting period in the conservation zone and remained there until early May. Periodic rain events kept the pool level in the flood control zone until mid July. Releases from May to July ranged from 0 to 29 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-15 and H-16.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 1,381 cfs Mar 24 87 420 cfs Jul 25 93 1249.09 Jul 25 93 2nd 1,347 cfs Jul 13 93 419 cfs Mar 25-26 87 1248.40 Mar 24-27 87 3rd 1,074 cfs Jul 19 85 311 cfs Jun 13 84 1247.10 Jun 12 84

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1240.20 Oct 14 79 2nd 1241.20 Dec 27 76 3rd 1241.40 Aug 03 77

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 3,618 AF, 47% of Normal 922 AF, 18% of Normal

Peak Daily Inflow Peak Daily Outflow 359 cfs on Aug 22 29 cfs on Jun 13

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1244.94, Jun 12 1242.33, Aug 19

H-19 APPENDIX H SALT CREEK BASIN

FIGURE H-15 – SALT CREEK DAM 14 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-16 – SALT CREEK DAM 14 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-20 APPENDIX H SALT CREEK BASIN

ANTELOPE CREEK DAM AND HOLMES PARK LAKE SALT CREEK BASIN - NO. 17, NEBRASKA 2002-2003 REGULATION

1. General. There was reservoir regulation activity during the reporting period. In September releases began at the request of Lincoln Parks and Recreation to draw down the reservoir to permit lake rehabilitation. Once the water was low enough the low level gate was moved approximately 8 feet below it’s current position. This was also part of the lake rehabilitation project. The project was operated according to the water control manual for the balance of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation started the reporting period in the conservation zone. In mid August 2002, the pool entered the flood control zone for 2 weeks and again in early October 2002 for 2 days. Once the pool elevation had reached the new low level gate opening pumping began to further draw down the reservoir. Releases ranged from 0 to 73 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-17 and H-18.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 604 cfs Jul 24 93 187 cfs Jun 29 83 1249.97 Jul 24 93 2nd 567 cfs Sep 08 89 174 cfs Jul 25 93 1249.09 Sep 08 89 3rd 451 cfs Jul 20 96 140 cfs Sep 09 89 1248.10 Jun 27 83

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1232.80 Jul 07 77 2nd 1232.90 Aug 03 77 3rd 1236.10 Jul 30 76

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 3,888 AF, 112% of Normal 2,358 AF, 80% of Normal

Peak Daily Inflow Peak Daily Outflow 133 cfs on Oct 04 73 cfs on Aug 25

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1244.30, Aug 25 1237.98, Jan 26

H-21 APPENDIX H SALT CREEK BASIN

FIGURE H-17 – SALT CREEK DAM 17 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-18 – SALT CREEK DAM 17 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-22 APPENDIX H SALT CREEK BASIN

BRANCHED OAK DAM AND LAKE SALT CREEK BASIN - NO. 18, NEBRASKA 2002-2003 REGULATION

1. General. The project was operated according to the water control manual for the balance of the reporting period. Table H-1 gives pertinent data for this reservoir.

2. Operation Details. The pool elevation was in the conservation zone for the entire reporting period. In September a release was made to facilitate the periodic inspection and in July another release was made at the request of the Department of Natural Resources to satisfy water rights holders. Releases ranged from 0 to 4 cfs. Historical as well as reporting period details are contained in paragraphs 2a through 2c and Figures H-19 and H-20.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 3,700 cfs Aug 25 87 774 cfs Jul 25 93 1287.90 Aug 26 87 2nd 2,435 cfs Mar 23 87 730 cfs Aug 26 87 1287.79 Jul 24 93 3rd 1,945 cfs May 22 98 670 cfs Jun 19 83 1287.70 Jun 18 83

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1278.39 Jan 12 02 2nd 1278.45 Aug 19 02 3rd 1278.60 Jan 13 99

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 4,717 AF, 17% of Normal 204 AF, 1% of Normal

Peak Daily Inflow Peak Daily Outflow 134 cfs on Oct 04 4 cfs on Aug 01

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1280.10, May 21 1278.45, Aug 19

H-23 APPENDIX H SALT CREEK BASIN

FIGURE H-19 – SALT CREEK DAM 18 POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE H-20 – SALT CREEK DAM 18 HISTORICAL POOL ELEVATIONS AND RELEASES.

H-24 APPENDIX I SAND CREEK BASIN

TABLE I-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT KELLY ROAD WESTERLY CREEK NO GENERAL 1 Location of dam Lowry A.F.B., Denver, CO Lowry A.F.B., Denver, CO 2 River and river mile Westerly Creek Westerly Creek 3 Drainage area (sq. mi.) 10.84 9.29 4 Reservoir length (mi.) Normally dry Normally dry 5 Location of Damtender Rocky Mt. Area Rocky Mt. Area 6 Travel time to Missouri River 2 weeks 2 weeks 7 Max. discharge of record Not available Not available 8 Project cost (1) $232,000 (Original Cost) Not available DAM AND EMBANKMENT 9 Top of dam – ft-msl 5372.0 5363.0 West Emb. 5434.5 10 Length of dam - ft. 4,700 9100 11 Height of dam - ft. 32 45.5 12 Stream bed – ft-msl 5,340 5389 13 Abutment formation Overburden-sandy clay Not available 14 Type of fill Rolled earth Rolled earth 15 Fill quantity in cu. yds. 200,000 Not available 16 Date of closure November 1953 Rehab 1978 July 1991 17 Date of initial fill (base F.C.) Dry Pool Dry Pool SPILLWAY 18 Discharge capacity - cfs 3,600 cfs at elevation 5366.8 46,900 cfs at el. 5431.4 19 Crest elevation – ft-msl 5362.0 5419.0 20 Width - ft. 120 400 21 Gates, number, size, type Uncontrolled concrete U wall and Uncontrolled grass lined, earth cut chute RESERVOIR ELEVATION AND AREA 22 Maximum pool 5366.8 43a 5431.4 375a 23 Top of flood control pool 5362.0 38a 5419.0 275a 24 Top of multipurpose pool none none 25 Top of inactive pool none none STORAGE ZONES (Elev. - Capacity) 26 Surcharge 5362.0 - 5366.8 200AF 5419.0 - 5431.4 3950AF 27 Flood Control 5342.0 - 5362.0 360AF 5389.0 - 5419.0 4150AF 28 Multipurpose none none 29 Inactive none none 30 Gross (top of flood control pool) 360AF 4150AF

OUTLET WORKS 31 Number and size - conduits 1 - 5.5 ft. circular conduit 1 - 4 ft. prestressed concrete 1 - 30 in. CMP cylinder pipe 32 Conduit length - ft. 260 ft. 907 ft.

33 Number - size - type gates Ungated drop inlet-el. 5358.4 1 - 48 x 24 inches hand Gated inlet - el. 5342.0 operated sluice

34 Discharge capacity 570 cfs at el. 5362.0 98 cfs at el. 5431.4

35 POWER INSTALLATION none none

I-1 APPENDIX I SAND CREEK BASIN

KELLY ROAD DAM SAND CREEK BASIN, COLORADO 2002-2003 REGULATION

1. General Operations. Kelly Road Detention Dam is located on Westerly Creek, a tributary of Sand Creek and the South Platte River and provides flood control for the City of Aurora, Colorado. It is located entirely within the boundaries of the former Lowry Air Force Base. The project's sole purpose is flood control and was not designed to permanently store water. Water is automatically impounded by the project and released through a ground level 24-inch CMP conduit or high overflow inlet. A gate on the 24- inch conduit is kept in the open position. The intended closure of the gate is to contain oil or other spills within the air base. The City of Aurora is responsible for obtaining pool gage readings during flood periods and general observation of project operation. Table I-1 gives pertinent data for this reservoir.

2. Previous Years Operations. No reports of heavy inflow into Kelly Road Dam were made during the reporting period.

I-2 APPENDIX I SAND CREEK BASIN

WESTERLY CREEK DAM SAND CREEK BASIN, COLORADO 2002-2003 REGULATION

1. General Operations. The Westerly Creek Dam is located approximately 0.8 miles upstream from the Kelly Road Dam on the southern edge of the former Lowry Air Force Base. Construction of Westerly Creek Dam was completed in July of 1991. Both the dam and the detention area are located within the confines of the former Lowry Air Force Base and were constructed for the purpose of flood control. The reservoir is generally dry and no permanent storage is provided. The reservoir is discharged by an orifice-controlled outlet structure and overflow spillway. The capacity of the outlet works is 98 cfs at a pool capacity elevation of 5,431.4 ft-msl. Discharge from the outlet works is governed by the capacity of the existing 48-inch RCP storm sewer running into the Kelly Road pool. The sluice gate is intended to remain open unless overtopping of the Kelly Road Dam is imminent or the downstream storm sewer capacity is exceeded due to inflows from the downstream drainage area at this time the gate would be closed until downstream conditions permit releases from the Westerly Creek pool. Table I-1 gives pertinent data for this reservoir.

2. Land Transfer. As part of the closure of Lowry Air Force Base, lands on the base that are necessary for the continued function of the Westerly Creek Dam Project are being transferred to both public and private interests. The land transfer is being coordinated by the Lowry Redevelopment Authority (LRA). Westerly Creek Dam was constructed by the Corps of Engineers, as per a Local Cooperation Agreement (LCA) with the Urban Drainage and Flood Control District. The Westerly Creek Dam embankment and spillway footprint are being transferred fee title to the Urban Drainage and Flood Control District. Other areas necessary for the operation of the project such as areas along the downstream toe of the embankment and the pool area above elevation 5429 ft-msl are being sold to private developers with a flowage easement and restrictions on the types of development that can occur.

3. Previous Years Operations. No reports of heavy inflow into Westerly Creek Dam were made during the reporting period.

I-3 APPENDIX I SAND CREEK BASIN

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I-4 APPENDIX J SOUTH PLATTE RIVER BASIN

TABLE J-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT BEAR CREEK CHATFIELD CHERRY CREEK NO GENERAL 1 Location of dam 3 mi. S W of Denver, CO 2 mi. S of Denver, CO 10 mi. S E of Denver, CO 2 River and river mile Bear Creek R M 8 South Platte River R M 321 Cherry Creek R M 11.4 3 Drainage area (sq. mi.) 236 3,018 386 4 Reservoir length (mi.) 0.5 at elevation 5558 2.0 at elevation 5430 1.5 at elevation 5550 5 Location of Damtender At Chatfield Dam On site At Chatfield Dam 6 Travel time to Missouri River 2 weeks 2 weeks 2 weeks 7 Max. discharge of record 8,600 cfs July 1896 110,000 cfs June 1965 58,000 cfs June 1965 8 Project cost (1) $61,700,00 $101,130,000 $14,670,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 5689.5 5527 5644.5 10 Length of dam – ft. 5,300-main 2,100-South 13,136 14,300 11 Height of dam – ft. 179.5-main 65-South 147 141 12 Stream bed – ft-msl 5,510 5,380 5504 13 Abutment formation Clay,shale,siltstone,sandstone Sandy overburden-Dawson F. Sandstone, clay, silt 14 Type of fill Rolled earth Rolled earth Rolled earth 15 Fill quantity in cu. yds. 11,346,000-main 770,000-So. 14,650,000 13,000,000 16 Date of closure July 1977 August 1973 October 1948 17 Date of initial fill (base F.C.) May 1979 June 1979 March 1960 SPILLWAY 18 Discharge capacity – cfs 153,500 cfs at el. 5684.5 188,000 cfs at el. 5521.6 38,350 cfs at el. 5636.2 19 Crest elevation – ft-msl 5667.0 5500.0 5608.7 (4) 20 Width – ft. 800 500 67 21 Gates, number, size, type Ungated earth channel Ungated converging chute Ungated earth channel RESERVOIR ELEV. AND AREA (1987 data) (1991 data)) (1988 data) 22 Maximum pool 5684.5 1220a 5521.6 5977a 5645.0 (3) 4820a 23 Top of flood control pool 5635.5 715a 5500.0 4770a 5608.7 3101a 24 Top of multipurpose pool 5558.0 107a 5432.0 1423a 5550.0 844a 25 Top of inactive pool 5528.0 16a none none STORAGE ZONES (Elev. – Capacity) (1987 data) (1991 data) (1988 data) 26 Surcharge 5635.5 – 5684.5 47,352AF 5500 – 5521.6 116,268AF 5608.7-5645.0 142,069AF(4) 27 Flood Control 5558.0 – 5635.5 28,715AF 5432 – 5500.0 206,729AF 5550.0 –5608.7 28 Multipurpose 5528.0 – 5558.0 1,909AF 5385 – 5432 27,018AF 110,037AF(4) 29 Inactive 5510 – 5528.0 65AF 5377 – 5385 28AF 5504.0 –5550.0 12,805AF 30 Gross (top of flood control pool) 30,689AF 235,098AF none 92,126AF(4) OUTLET WORKS 31 Number and size – conduits 1 – 7 ft. circular – upstream 2 – 11 x 16 ft. oval conduit 2 – 8 x 12 ft. oval conduit 1 – 7 x 10.5 ft. – downstream 1 – 12 ft. circular conduit 32 Conduit length – ft. 1690 ft. 1280 ft. 679.5 ft. Ungated drop inlet – el. 5558 33 Number – size – type gates 2 – 3 x 6 ft. hydraulic slide 2 – 6 x 13.5 ft. hydraulic slide 5 – 6 x 9 ft. – hydraulic slide 2 – 36” K-flo Butterfly 2 – 2 x 2 ft. slide-gate on gate 2 – 18 in. bypass gates 1 – 72 in. butterfly 34 Discharge capacity 2,169 cfs at el. 5667 8400 cfs at el. 5500.0 8100 cfs at el. 5598.0

35 POWER INSTALLATION none none none

(1) Costs are as of 9-30-80. (2) Due to updated Hydrological Improvement Assessment for Cherry Creek Reservoir, with the maximum pool the dam would be overtopped. (3) Top of Flood Control Pool is elevation 5598.0, which was original spillway crest elevation. Due to sloughing of spillway side slopes, spillway crest elevation is 5608.7 ft-msl.

J-1 APPENDIX J SOUTH PLATTE RIVER BASIN

CHERRY CREEK DAM AND LAKE CHERRY CREEK SOUTH PLATTE RIVER BASIN, COLORADO 2002-2003 REGULATION

1. General. On 1 April 1988, the State of Colorado, through the State Engineer, implemented strict administration of water rights within the Cherry Creek basin. When a senior river call is in effect, the Cherry Creek Reservoir is required to pass inflow through the project. The Water Control and Water Quality Section coordinated releases from the project to comply with downstream river calls as determined by the Colorado State Engineer’s office. A total of 25 release orders were made during the reporting period. The releases were made to meet downstream water needs, and to maintain the conservation pool level. For the second consecutive year in a row the annual sediment flushing was not completed this year. The low flow flush, with a maximum discharge of 250 cfs, was again cancelled due to extremely low reservoir inflows and dry conditions.

2. Operation Details. Cherry Creek Dam and Reservoir is operated within a transition zone of 5550.0 to 5551.0 feet above msl. The transition zone was established to minimize the number of gate changes needed to keep the reservoir at or near the full conservation pool level of 5550.0 feet above msl.

A March 18 storm dropped more snow in Denver than had been seen in any single snowstorm since 1913. The snowfall boosted the snowpack in the South Platte basin to 104 percent of normal. The 5 inches of moisture nearly equaled the total precipitation last year for the metro area of 7.4 inches. Normal precipitation for Denver is 15 inches. Even with the snowfall and the subsequent melt runoff into Cherry Creek Reservoir was slight with most of the melting snow infiltrating into the dry soil. The March snow fall was followed by a rainfall event on April 24 that brought over 2 inches of moisture to the basin. Again, due to the dry conditions, the rainfall event resulted in only a 2.5 foot pool rise.

J-2 APPENDIX J SOUTH PLATTE RIVER BASIN

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 6,150 cfs Jun 16 65 560 cfs Aug 7-8 65 5565.82 Jun 03 73 2nd 3,195 cfs May 06 73 450 cfs Mar 27 60 5562.52 Aug 01 65 3rd 1,440 cfs Jul 24 83 375 cfs Jun 08 73 5557.89 Jul 25 83

b. Minimums of Record (since initial fill):

Pool-Date Lowest 5543.51 Jan 29 65 2nd 5544.97 Jul 31 64 3rd 5545.90 Nov 23-24 78

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 14,253, 144% of normal 11,722, 169% of normal

Peak Daily Inflow Peak Daily Outflow 572 cfs, April 24 151 cfs, April 29

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 5552.42, April 28 5548.84, October 26

J-3 APPENDIX J SOUTH PLATTE RIVER BASIN

FIGURE J-1 – CHERRY CREEK DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD

FIGURE J-2 – CHERRY CREEK DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

J-4 APPENDIX J SOUTH PLATTE RIVER BASIN

BEAR CREEK DAM SOUTH PLATTE RIVER BASIN, COLORADO 2002-2003 REGULATION

1. Previous Year Operation. In response to the contracts for temporary water storage, a revised Memorandum of Understanding (MOU) between the Corps of Engineers and the State of Colorado was signed on 20 June 1988. This memorandum supercedes the previous MOU dated 11 May 1977. Under normal conditions the Bear Creek Dam outlet works are set to automatically pass streamflow up to 500 cfs when pool elevations are above the drop inlet-outlet weir crest of 5558.0 ft-msl. When conditions warrant, higher releases are made by opening two slide service gates in the dome-type gated control structure buried under the embankment. Under the revised MOU, the State Engineer or his representative will determine the storage and releases necessary to satisfy downstream water right requirements when the pool level is below elevation 5559.0 ft-msl. Elevation 5559.0 ft-msl is one foot into the flood storage zone and was selected to allow flexibility in targeting authorized pool levels. No contract water was stored during the report period. The State of Colorado, Department of Natural Resources, Division of Game, Fish and Parks, in a letter dated 1 October 1970, agreed to provide water for the initial filling and replenishment of evaporation losses from the recreation pool, by purchase or other means, consistent with Federal and State laws to assure effective operation of the project for recreation.

2. Operation Details. For most of the report period gated releases were made at the direction of the State Engineer. Gated releases were made to satisfy a senior water right holder and resulted in pool elevations dropping below the top of the multipurpose zone (elevation 5558 ft, msl) to record low levels. In the middle part of May, after satisfying the water right, the reservoir was allowed to fill to the top of the conservation pool and operation of the project reverted to a “pass through” or “fill and spill” mode for the first time in over a year. Although conditions were improved over last year, for the fourth year in a row the Bear Creek basin experienced extremely dry conditions during the reporting period. No flood control releases were made during the reporting period.

J-5 APPENDIX J SOUTH PLATTE RIVER BASIN

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 910 cfs May 01 80 800 cfs May 5-12 80 5587.09 Jun 18 95 2nd 796 cfs Jun 09 95 800 cfs Jun 12 79 5580.96 Jun 23 83 3rd 690 cfs Jun 10 79 612 cfs Jun 24 95 5576.3 May 19 80

b. Minimums of Record (since initial fill):

Pool-Date Lowest 5549.17 Oct 18 99 2nd 5554.65 Sep 09 02 3rd 5555.89 Jul 31 02

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 21,275 AF, 58% of normal 20,694 AF, 57% of normal

Peak Daily Inflow Peak Daily Outflow 250 cfs on Apr 15 281 cfs on Apr 16

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 5561.16, Apr 14 5554.65, Sep 09

J-6 APPENDIX J SOUTH PLATTE RIVER BASIN

FIGURE J-3 –BEAR CREEK DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE J-4 – BEAR CREEK DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

J-7 APPENDIX J SOUTH PLATTE RIVER BASIN

CHATFIELD DAM AND LAKE SOUTH PLATTE RIVER BASIN, COLORADO 2002-2003 REGULATION

1. Previous Year Operation. Before Chatfield Dam became operational, the Corps Water Control Section requested that the Colorado State Engineers Office, acting through the District 8 Water Commissioner, assume responsibility for determining releases from the multipurpose pool in an effort to keep the Corps free of water rights conflicts. This relationship was put into a formal document dated 30 March 1973, when the multipurpose pool was increased from elevation 5430.0 to 5432.0 ft-msl and contained water storage commitments by the State. By contract, the State is committed to keeping the pool above elevation 5423.0 ft-msl for recreation and fish and wildlife purposes. Since 1979, the City of Denver through the State of Colorado has been permitted to regulate storage in the conservation pool in return for the city's commitment to provide sufficient water in the pool for recreation. The city is committed to keeping 20,000 acre-feet (Elevation 5426.94 ft-msl) of water in the pool from 1 May through 31 August, and permitted to use 10,000 acre-feet of storage space in the reservoir between elevations 5423.8 and 5432.0 ft-msl. The original top of multipurpose pool level was at elevation 5426.0 ft-msl.

2. Operation Details. An operational deviation was approved on 7 January 2003 for the storage of water an additional 1.25 feet above the existing base of the flood control pool. The overall intent of allowing extra storage in the flood control pool was to lessen the amount the pool would be drawn down in the spring to meet local water needs. This deviation request was an extension of a request granted on 9 July 2002 and covered the period of 18 December 2002 through 1 March 2003.

In addition to this short term deviation to store water at Chatfield the City of Denver (City) requested that they be allowed to construct a pumping station below the Chatfield outlet works and to draw the pool down below elevation 5423.0 ft, msl beginning 1 July, 2003. This request was based on the 1979 agreement between the State and the Corps that permits the State to draw the pool below elevation 5423.0 ft, msl in the event of a “severe and protracted drought determined by the State and approved by the District Engineer”. The District Engineer agreed that the condition of draught existed but also requested that an Environmental Assessment (EA) be completed prior to approving construction of the pumping station and the draw down. A contractor, ENSR International, was hired by the City to provide a draft EA to the Corps by 14 February 2003. Following completion of the draft and submittal to the District complicating issues surfaced including adverse impacts to the Chatfield marina and the fisheries. These issues have delayed the completion of the final EA.

Following the March 17-20, 2003 snow storm the potential for substantial runoff into the trilakes projects seemed to be quite high. A widespread snow cover of 30-inch depth blanketed the Denver area both upstream and downstream of the projects. This snow depth was higher immediately upstream of Chatfield and Bear Creek and also increased substantially with elevation. The 30 inches of snow translated into as much as 4 inches of water equivalency. With a sudden melt and even some rainfall on top of the snow a strong possibility existed for record high pool levels at all three projects.

J-8 APPENDIX J SOUTH PLATTE RIVER BASIN

Rough forecasts of inflow from just low elevation snowmelt resulted in pool rises of 4–8 feet at Cherry Creek and 2-4 feet at Chatfield Reservoirs. This was based on a net runoff of 0.1 to 0.25 inches distributed over the upstream watersheds. At the time, with daytime temperatures in the 40’s, the amount of the forecasted runoff seemed to be almost a minimum.

The low elevation snow cover disappeared within a two-week period with pool levels rising only slightly at the projects. All three reservoirs, Chatfield, Cherry Creek, and Bear Creek rose approximately 1 foot within this two-week period. This increase in storage roughly translates into less than 0.1 inches of runoff from the 4 inches of water above the projects. Two factors were responsible for this minimum amount runoff into the projects. The first one was extremely dry soil moisture took a good portion of the melting snow. The second was nighttime temperatures below freezing and daytime temperatures slightly above freezing resulted in a very slow melt that had time to infiltrate into the soil.

J-9 APPENDIX J SOUTH PLATTE RIVER BASIN

TABLE J-2 OBSERVER READINGS OF MARCH 17-18, 2003 STORM TOTALS

TOTAL SNOWFALL ESTIMATED WATER OBSERVER LOCATION COUNTY (IN) EQUIVILENT (IN) Cabin Creek Clear Creek 83.0 11.9 Bergen Park 3SW Jefferson 74.0 10.6 Evergreen 8NW Jefferson 72.9 10.4 Coal Creek Canyon Jefferson 71.8 10.3 Conifer 4ENE Jefferson 69.0 9.9 Georgetown Clear Creek 66.9 9.6 Idaho Springs 10WNW Clear Creek 66.1 9.4 Conifer 3W Jefferson 66.0 9.4 Chatfield 5W Jefferson 62.6 8.9 Lookout Mountain Jefferson 58.2 8.3 Sedalia 8W Douglas 54.0 7.7 Evergreen 1SW Jefferson 53.2 7.6 Golden 4SW Jefferson 50.5 7.2 Buffalo Creek Jefferson 48.0 6.9 Pine Junction Jefferson 48.0 6.9 Sedalia 10SW Douglas 48.0 6.9 Ken Caryl Ranch Jefferson 46.6 6.7 Deckers Douglas 46.0 6.6 Sedalia 5SW Douglas 46.0 6.6 Bailey 2NE Park 45.0 6.4 Genesee Jefferson 45.0 6.4 Roxborough Village Douglas 42.0 6.0 Aurora Arapahoe 40.3 5.8 Centennial Arapahoe 38.0 5.4 Parker 6E Douglas 38.0 5.4 Larkspur 2W Douglas 37.5 5.4 Buckley AFB Arapahoe 37.0 5.3 Castle Rock Douglas 36.0 5.1 Lakewood Jefferson 36.0 5.1 Crow Hill Park 35.0 5.0 Denver SW Denver 35.0 5.0 Highlands Ranch Douglas 35.0 5.0 Arvada Jefferson 33.0 4.7 Parker Douglas 32.0 4.6 Stapleton Denver 31.8 4.5 Denver NW Denver 31.5 4.5 Westminster Jefferson 31.0 4.4 Franktown Douglas 30.0 4.3 Hartsel 15SW Park 28.0 4.0 Westcreek 1S Douglas 27.0 3.9 Elizabeth 6N Elbert 22.0 3.1 Denver International Airport Denver 19.0 2.7 Bennett 4S Arapahoe 16.0 2.3 Bennett 4S Arapahoe 15.0 2.1 Lake George Park 14.0 2.0 Matheson 8SE Elbert 13.2 1.9 Fairplay Park 11.0 1.6 Antero Reservoir Park 8.0 1.1

J-10 APPENDIX J SOUTH PLATTE RIVER BASIN

FIGURE J-5 – COLORADO SNOWFALL TOTALS IN INCHES FOR MARCH 17-20, 2003

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 3,394 cfs Jul 03 95 3,350 cfs Jul 07 95 5447.58 May 26 80 2nd 3,370 cfs May 30 83 3,034 cfs May 15 84 5447.08 Jun 30 83 3rd 3,155 cfs May 09 80 3,027 cfs May 27 87 5446.40 Jul 04 95

b. Minimums of Record (since initial fill):

Pool-Date Lowest 5423.59 Oct 14 98 2nd 5423.63 Dec 18 95 3rd 5424.09 Nov 02 87

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow Total Outflow 59,525 AF, 38% of normal 60,082 AF, 40% of normal

Peak Daily Inflow Peak Daily Outflow 580 cfs on Jun 02 634 cfs on Apr 30

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 5433.42, Mar 24 5425.87, Jul 31

J-11 APPENDIX J SOUTH PLATTE RIVER BASIN

FIGURE J-6 – CHATFIELD DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE J-7 – CHATFIELD DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

J-12 APPENDIX K BUREAU OF RECLAMATION PROJECTS

TABLE K-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT BOYSEN CANYON FERRY CLARK CANYON NO GENERAL 1 Location of dam 20 mi S of Thermopolis,Wy 17 mi NE of Helena, MT 18 mi SW of Dillon, MT 2 River and river mile Wind RM 295 Missouri RM 2253 Beaverhead 3 Drainage area (sq. mi.) 7710 15900 2320 4 Reservoir length (mi.) 17.5 at el. 4725 25 at el. 3800 5 at el. 5560.4 5 Location of Damtender On site On site Dillon, MT 6 Travel time to Missouri River 6 days 4.5 days to Ft. Peck 2.5 days to Three Forks 7 Max. discharge of record 29,800 cfs Jul 1923 47,000 cfs Jun 1908 3720 cfs Jun 1908 8 Project cost (1) $33,468,000 $42,546,000 $12,108,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 4758.0 3808.5 5578.0 10 Length of dam - ft. 1143 1000 2950 11 Height of dam - ft. 150 225 147.5 12 Stream bed – ft-msl 4608 3635.5 5446.5 13 Abutment formation Sandstone-shale-limestone Shale - slate Sand - bentonitic tuff 14 Type of fill Rolled earth Concrete gravity Rolled earth 15 Fill quantity in cu. yds. 1,527,000 407,100 1,884,000 16 Date of closure Oct 1951 Mar 1953 Aug 1964 17 Date of initial fill (top of conser. pool) Jun 1952 Jul 1955 Jun 1965 SPILLWAY 18 Discharge capacity - cfs (Max. pool) 20,000 at el. 4725 150,000 9530 19 Crest elevation – ft-msl 4700.0 3766.0 5560.4 20 Width - ft. 60 (net) 68 (total) 204 (net) 222 (gross) 100 21 Gates, number, size, type 2 (30 x 25 ft) radial 4 (51 x 34.5 ft) radial Ungated chute RESERVOIR ELEV. AND AREA 22 Maximum pool 4752.0 30,860a 3800.0 33,535a 5571.9 6600a 23 Top of flood control pool 4732.2 22,170a 3800.0 33,535a 5560.4 5900a 24 Top of joint use pool 4725.0 19,560a 3797.0 32,800a 5546.1 5160a 25 Top of conservation pool 4717.0 16,960a 3770.0 24,125a 5535.7 4495a 26 Top of inactive pool 4685.0 9,280a 3728.0 11,480a 5470.6 220a STORAGE ZONES (Elev. - Capacity) 27 Surcharge zone 4732.2-4752.0 520,679AF none 5560.4-5571.0 71,830AF 28 Exclusive flood control zone 4725.0-4732.2 150,632AF 3797.0-3800.0 99,460AF 5546.1-5560.4 79,090AF 29 Joint use zone 4717.0-4725.0 144,229AF 3770.0-3797.0 795,135AF 5535.7-5546.1 50,440AF 30 Conservation zone 4685.0-4717.0 378,184AF 3728.0-3770.0 711,460AF 5470.6-5535.7 126,120AF 31 Inactive zone 4608.0-4685.0 219,181AF 2635.5-3728.0 445,455AF 2446.5-5470.6 1,510AF 32 Gross Storage (Excl. of surcharge) 892,226AF 2,051,520AF 257,150AF OUTLET WORKS 33 Number and size - conduits 1 - 66 in. I.D. 4 - 84 in. I.D. 1 - 9 ft. I.D. 1 - 57 in. I.D. 1 - 13 ft. I.D. pump intake 34 Conduit length - ft. 300 84 in. - 115 741 35 Number - size - type gates 2 - 48 in. Jet valves 4 - 77 in. Slide 9500 2 - 3 x 6.5 ft. Slide 36 Disch. capac. - cfs (At base of EFC 66 in. - 640 1 - 13 ft. dia. 600 2200 zone) 57 in. – 670 3 - 13.5 ft. dia. 5970 POWER INSTALLATION 37 No. and size of turbines 2 - 10,500 HP 3 - 23,500 HP 38 No. and rating of generators 2 - 7500 kW 3 - 16,667 KW none 39 Plant capacity 15,000 KW 50,000 KW 40 Power Plant disch. capac.(At base 5200 cfs 5200 cfs of EFC) (1) These costs to complete the dam and reservoir, the associated recreation and fish and wildlife facilities and the power plant are applicable. Costs do not include irrigation facilities except those located at the dam. Costs are as of 6-30-76. (2) TIBER AUXILIARY OUTLET No. and size of conduits 1 - 10.75 ft. I.D. Conduit length - ft. 1535 No. - Size - Type gates 1 - 7.25 x 9.25 ft. slide 2 - 7.0 x 12.0 ft. slide Discharge capacity - cfs 4250 at el. 3020.2 (3) Pactola Dam was raised 15 feet in 1987

K - 1 APPENDIX K BUREAU OF RECLAMATION PROJECTS

TABLE K-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT GLENDO HEART BUTTE JAMESTOWN NO GENERAL 1 Location of dam 4.5 mi SE of Glendo, WY 15 mi S of Glen Ullin, ND 1 mi N of Jamestown, ND 2 River and river mile North Platte RM 280 Heart RM 103.5 James RM 580 3 Drainage area (sq. mi.) 14330 1710 1300 4 Reservoir length (mi.) 15 at el. 4635 12 at el. 2094.5 40 at el. 1454 5 Location of Damtender On site On site none 6 Travel time to Missouri River About 3 weeks 2 days About 7 weeks 7 Max. discharge of record 30,000 cfs Jun 1908 30,500 cfs May 1970 + 8000 cfs Apr 1969 8 Project cost (1) $44,371,000 $3,576,000 $3,717,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 4675.0 2124.0 1471.0 10 Length of dam - ft. 2096 1850 1418 11 Height of dam - ft. 167 124 85 12 Stream bed – ft-msl 4508 2000 1386 13 Abutment formation Sandstone - shale Sandstone Pierre shale 14 Type of fill Rolled earth Rolled earth Rolled earth 15 Fill quantity in cu. yds. 2,676,000 1,140,000 963,000 16 Date of closure Jun 1956 Aug 1949 May 1953 17 Date of initial fill (top of conser. pool) May 1959 Apr 1950 Apr 1965 SPILLWAY 18 Discharge capacity - cfs (Max. pool) 10,300 5650 2930 19 Crest elevation – ft-msl 4653.0 2064.5 1454 20 Width - ft. 45 27 9.5 21 Gates, number, size, type Ungated ogee weir Ungated glory hole Ungated glory hole RESERVOIR ELEV. AND AREA 22 Maximum pool 4669.0 23,300a 2118.2 10,950a 1464.4 17,430a 23 Top of flood control pool 4653.0 17,990a 2094.5 6,580a 1454.0 13,210a 24 Top of joint use pool - - 1432.67 2,560a 25 Top of conservation pool 4635.0 12,370a 2064.5 3,400a 1429.8 2,090a 26 Top of inactive pool 4570.0 3,130a 2030.0 800a 1400.0 160a STORAGE ZONES (Elev. - Capacity) 27 Surcharge zone 4653.0-4669.0 329,300AF 2094.5-2118.2 206,400AF 1454.0-1464.4 158,900AF 28 Exclusive flood control zone 4635.0-4653.0 271,900AF 2064.5-2094.5 147,900AF 1432.7-1454.0 185,400AF 29 Joint use zone none none 1429.8-1432.7 6,600AF 30 Conservation zone 4570.0-4635.0 454,300AF 2030.0-2064.5 69,000AF 1400.0-1429.8 28,100AF 31 Inactive zone 4508.0-4570.0 63,200AF 2000.0-2030.0 6,800AF 1386.0-1400.0 820AF 32 Gross Storage (Excl. of surcharge) 789,400AF 223,600AF 221,000AF OUTLET WORKS 33 Number and size - conduits 1 - 21 ft. I.D. 1 - 63 in. I.D. 1 - 9.5 ft. - 13.5 ft.

34 Conduit length - ft. 2300 597 443.75 35 Number - size - type gates 3 - 7.25 x 7.75 ft. Slide 1 - 4 x 5 ft. Slide 2 - 5 x 6 ft. Slide 36 Disch. capac. - cfs (At base of EFC zone) 11,300 690 2175 at el. 1429.8 POWER INSTALLATION 37 No. and size of turbines 2 - 16,750 HP 38 No. and rating of generators 2 - 12,000 KW none none 39 Plant capacity 24,000 KW 40 Power Plant disch. capac.(At base of 3300 cfs EFC) (1) These costs to c omplete the dam and reservoir, the associated recreation and fish and wildlife facilities and the power plant are applicable. Costs do not include irrigation facilities except those located at the dam. Costs are as of 6-30-76. (2) TIBER AUXILIARY OUTLET No. and size of conduits 1 - 10.75 ft. I.D. Conduit length - ft. 1535 No. - Size - Type gates 1 - 7.25 x 9.25 ft. slide 2 - 7.0 x 12.0 ft. slide Discharge capacity - cfs 4250 at el. 3020.2 (3) Pactola Dam was raised 15 feet in 1987

K-2 APPENDIX K BUREAU OF RECLAMATION PROJECTS

TABLE K-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT KEYHOLE PACTOLA SHADEHILL NO GENERAL 1 Location of dam 12 mi NE of Moorcroft, WY 15 mi W of Rapid City, SD 1 mi W of Shadehill, SD 2 River and river mile Belle Fourche RM 289 Rapid Cr. RM 110 Grand RM 90 3 Drainage area (sq. mi.) 1950 319 3120 4 Reservoir length (mi.) 10 at el. 4111.4 4.5 at el. 4621.5 10 at el. 2302 5 Location of Damtender Pactola Dam On site none 6 Travel time to Missouri River 5 days 3 days 2 days 7 Max. discharge of record 12,000 cfs Apr 1924 2200 cfs May 1952 58,000 cfs Apr 1950 8 Project cost (1) $4,722,000 $7,861,000 $7,269,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 4134.0 4655.0 (3) 2318.0 10 Length of dam - ft. 3420 5290 12,840 11 Height of dam - ft. 118 245 122 12 Stream bed – ft-msl 4016 4422 2196 13 Abutment formation Sandstone and shale Slate and schist Sand, silt and clay 14 Type of fill Rolled earth and rock Rolled earth and rock Rolled earth 15 Fill quantity in cu. yds. 1,329,000 4,532,000 3,391,000 16 Date of closure Mar 1952 Aug 1956 Jul 1950 17 Date of initial fill (top of conser. pool) May 1978 Jun 1963 Apr 1952 SPILLWAY (Service) 18 Discharge capacity - cfs (Max. pool) 11000 255,000 5700 127,000 cfs 19 Crest elevation – ft-msl 4099.3 4621.5 2271.9 2302.0 20 Width - ft. 19.25 425 - 1500 21 Gates, number, size, type Ungated ogee weir Ungated ogee weir Ungated glory Ungated hole earth channel RESERVOIR ELEV. AND AREA 22 Maximum pool 4128.7 10,730a 4651.7 1,560a 2312.0 12,150a 23 Top of flood control pool 411.5 13,730a 4621.5 1,230a 2302.0 9,900a 24 Top of joint use pool - - - 25 Top of conservation pool 4099.3 9,410a 4580.2 860a 2271.9 4,800a 26 Top of inactive pool 4051.0 820a 4456.1 100a 2250.8 2,800a STORAGE ZONES (Elev. - Capacity) 27 Surcharge zone 4111.5-4128.7 294,800AF 4621.5-4651.7 41,892AF 2302.0-2312.0 111,200AF 28 Exclusive flood control zone 4099.3-4111.5 140,500AF 4580.2-4621.5 43,057AF 2271.9-2302.0 218,300AF 29 Joint use zone none none none 30 Conservation zone 4051.0-4099.3 185,500AF 4456.1-4580.2 54,955AF 2250.8-2271.9 80,900AF 31 Inactive zone 4016.0-4051.0 8,000AF 4422.0-4456.1 1,017AF 2196.0-2250.8 58,200AF 32 Gross Storage (Excl. of surcharge) 334,200AF 99,029AF 357,400AF OUTLET WORKS 33 Number and size - conduits 1 - 9.5 x 8.25 1 - 6 ft. 1 - 7 ft. I.D.

34 Conduit length - ft. 653.4 740 355 35 Number - size - type gates 2 - 3.5 x 3.5 ft. Slide 2 - 2.75 x 2.75 ft. Slide 1 - 6 x 6 ft. radial 36 Disch. capac. - cfs (At base of EFC zone) 1250 1020 600 at el. 2260 POWER INSTALLATION 37 No. and size of turbines 38 No. and rating of generators none none none 39 Plant capacity 40 Power Plant disch. capac.(At base of EFC) (1) These costs to complete the dam and reservoir, the associated recreation and fish and wildlife facilities and the power plant are applicable. Costs do not include irrigation facilities except those located at the dam. Costs are as of 6-30-76. (2) TIBER AUXILIARY OUTLET No. and size of conduits 1 - 10.75 ft. I.D. Conduit length - ft. 1535 No. - Size - Type gates 1 - 7.25 x 9.25 ft. slide 2 - 7.0 x 12.0 ft. slide Discharge capacity - cfs 4250 at el. 3020.2 (3) Pactola Dam was raised 15 feet in 1987

K - 3 APPENDIX K BUREAU OF RECLAMATION PROJECTS

TABLE K-1 SUMMARY OF ENGINEERING DATA ITEM SUBJECT TIBER YELLOWTAIL NO GENERAL 1 Location of dam 15 mi SW of Chester, MT 45 mi SW of Hardin, MT 2 River and river mile Marias RM 71 Bighorn 3 Drainage area (sq. mi.) 4850 19,626 4 Reservoir length (mi.) 25 at el. 3012.5 71 at el. 3657 5 Location of Damtender On site On site 6 Travel time to Missouri River 1.25 days 4 days 7 Max. discharge of record 40,000 cfs Jun 1948 37,400 cfs Jun 1935 8 Project cost (1) $44,909,000 (1983) $95,900,000 DAM AND EMBANKMENT 9 Top of dam – ft-msl 3026.0 3660.0 10 Length of dam - ft. 4300 1450 11 Height of dam - ft. 201 524 12 Stream bed – ft-msl 2823.5 3166 13 Abutment formation Shale and sandstone Limestone 14 Type of fill Rolled earth Concrete thin-arch 15 Fill quantity in cu. yds. 12,049,000 1,546,000 16 Date of closure Oct 1950 Dec 1966 17 Date of initial fill (top of conser. pool) Aug 1956 Jun 1967 SPILLWAY 18 Discharge capacity - cfs (Max. pool) 68,470 92000 19 Crest elevation – ft-msl 2975.0 3593.0 20 Width - ft. 66 50 (net) 21 Gates, number, size, type 3 - 22 x 38 ft. radial 2 - 25 x 64.4 ft. radial RESERVOIR ELEVATION AND AREA 22 Maximum pool 3020.2 25,410a 3660.0 17,940a 23 Top of flood control pool 3012.5 23,150a 3657.0 17,280a 24 Top of joint use pool 2993.0 17,890a 3640.0 12,600a 25 Top of conservation pool 2976.0 13,790a 3614.0 6,915a 26 Top of inactive pool 2966.4 11,710a 3547.0 4,150a STORAGE ZONES (Elev. - Capacity) 27 Surcharge zone 3012.5-3020.2 187,740AF 3657.0-3660.0 52,830AF 28 Exclusive flood control zone 2993.0-3012.5 400,900AF 3640.0-3657.0 258,330AF 29 Joint use zone 2976.0-2993.0 268,000AF 3614.0-3640.0 240,340AF 30 Conservation zone 2966.4-2976.0 121,700AF 3547.0-3614.0 336,100AF 31 Inactive zone 2823.5-2966.4 577,620AF 3166.0-3547.0 493,580AF 32 Gross Storage (Excl. of surcharge) 1,555,960AF 1,328,360AF OUTLET WORKS 33 Number and size - conduits 1 conduit containing 2 - 84 in. 1 - 72", 1 - 22" pipes 1 - 9.5 ft. 34 Conduit length - ft. 72" - 1110 22"-1090 289 - 216 - 305 35 Number - size - type gates 1-5x5' Slide, 1-18" butterfly 3 - bulkhead gates 36 Disch. capac. - cfs (At base of EFC zone) 1425 at el. 2993 84 in. - 2500 each Aux. outlet, see footnote (2) 9.5 ft. - 862 POWER INSTALLATION 37 No. and size of turbines 4 - 87,500 HP 38 No. and rating of generators none 4 - 62,500 KW 39 Plant capacity 250,000 KW 40 Power Plant disch. capac.(At base of EFC) 7800 cfs (1) These costs to complete the dam and reservoir, the associated recreation and fish and wildlife facilities and the power plant are applicable. Costs do not include irrigation facilities except those located at the dam. Costs are as of 6-30-76. (2) TIBER AUXILIARY OUTLET No. and size of conduits 1 - 10.75 ft. I.D. Conduit length - ft. 1535 No. - Size - Type gates 1 - 7.25 x 9.25 ft. slide 2 - 7.0 x 12.0 ft. slide

Discharge capacity - cfs 4250 at el. 3020.2 (3) Pactola Dam was raised 15 feet in 1987

K-4 APPENDIX K BUREAU OF RECLAMATION PROJECTS

BOYSEN DAM/YELLOWTAIL DAM AND RESERVOIRS WIND/BIGHORN RIVER BASINS, WYOMING 2002-2003 REGULATION

1. Description. Boysen Dam and powerplant was constructed during the period 1945- 1952 by the Bureau of Reclamation. Boysen Dam provides flood control, irrigation, power, silt control, recreation, and fish and wildlife.

Bighorn Reservoir/Yellowtail Dam was constructed by the Bureau of Reclamation, completed in December 1966, for the purposes of power production, irrigation, industrial water, flood control, fish and wildlife, sediment and recreation.

Table K-1 presents the 1994 survey of Boysen Reservoir storage allocations. Table K-2 presents the 1982 survey of Bighorn Lake storage allocations.

TABLE K-1 BOYSEN RESERVOIR STORAGE ALLOCATIONS Storage Zones Pool Elevation Zone Capacity Cum Capacity (ft above msl) (acre-feet) (acre-feet) Dead 4608-4657 40,084 40,084 Inactive 4657-4685 179,097 219,181 Conservation 4685-4717 378,184 597,365 Joint Use1 4717-4725 144,229 741,594 Flood Control1 4725-4732.2 150,632 892,226 Surcharge 4732.2-4752 520,679 1,412,905

TABLE K-2 BIGHORN LAKE STORAGE ALLOCATIONS Storage Zones Pool Elevation Zone Capacity Cum Capacity (ft above msl) (acre-feet) (acre-feet) Dead 3166-3296.5 16,008 16,008 Inactive 3296.5-3547 477,576 493,594 Conservation 3547-3614 336,103 829,687 Joint Use2 3614-3640 240,342 1,070,029 Flood Control2 3640-3657 258,331 1,328,360 Surcharge 3657-3660 52,829 1,381,189

2. Water Control Plans. The primary regulation of Boysen Reservoir will be for the local reduction of flow in the reaches between Boysen Dam and Yellowtail Dam. Coordinated regulation with Yellowtail to affect maximum reductions in downstream areas will still be a factor.

1 Water stored in the flood control zone of Boysen Reservoir are released under regulations prescribed by the Secretary of the Army under authority of the Flood Control Act of 1944. The exclusive flood control storage capacity of the reservoir (which initially amounts to 145,972 acre-feet, between elevations 4725 and 4732) and during the flood season, February 1 to July 31, that portion of the joint use storage capacity (which initially amounts in whole to 146,099 acre-feet between elevation 4717 and 4725) is determined as described in paragraph VI of this report. 2 Waters stored in the flood control zone of Bighorn Reservoir are released under regulations prescribed by the Secretary of the Army under authority of the Flood Control Act of 1944. The exclusive flood control storage capacity of the reservoir (which initially amounts to 258,331 acre-feet, between elevation 3640 and 3657) and during the flood season, February 1 to July 31, that portion of the joint use storage capacity (which initially amounts in whole to 240,342 acre-feet between elevations 3614 and 3640) is determined as described in paragraph VII of this report.

K - 5 APPENDIX K BUREAU OF RECLAMATION PROJECTS

Bighorn Reservoir will be regulated for flood control primarily for the reduction and prevention of flooding downstream from the project, on both the Bighorn and Yellowstone Rivers. There were no flood control regulation activities at either project during the reporting period.

3. Inflow Forecasts. Three federal agencies, the Corps of Engineers, Bureau of Reclamation and the Natural Resources Conservation Service (NRCS) are responsible for providing monthly independent April-July inflow forecasts for Boysen and Bighorn Reservoir. The Corps calculates their forecasts based on November and December inflows (antecedent conditions), observed January to June snowpack and actual and anticipated April to June precipitation. Table K-3 and K-4 displays the agencies' 2002 forecasts for Boysen and Bighorn Reservoirs, respectively. The snow water equivalency across the state of Wyoming was far below normal during the rating period. Monthly inflow forecasts by the Corps, USBR and NRCS all indicated that it was highly unlikely that either Boysen or Bighorn Reservoirs would enter into their respective flood pools.

TABLE K-3 FORECASTED % OF NORMAL APR-JUL 2002 BOYSEN RESERVOIRINFLOW3 Agency Feb 1 Mar 1 Apr 1 May 1 Jun 1 U.S. Army Corps of Engineers 73 74 88 76 67 Bureau of Reclamation 41 56 75 41 40 Nat Res Cons Service (NRCS) 42 48 54 39 N/A

TABLE K-4 FORECASTED % OF NORMAL APR-JUL 2002 BIGHORN RESERVOIR INFLOW 4 Agency Feb 1 Mar 1 Apr 1 May 1 Jun 1 U.S. Army Corps of Engineers 70 85 86 62 53 Bureau of Reclamation 35 60 60 61 39 Nat Res Cons Service (NRCS) 34 42 51 40 N/A

Actual inflow at Boysen and at Bighorn Reservoirs was 42% of normal and 47%, respectively.

4. Operation. While conditions in the Bighorn Basin in Wyoming were improved somewhat compared to the previous three years, extreme drought persisted in much of the Basin during WY 2003. The cumulative effect of four years of drought was evident as below average inflow and storage prevailed throughout the Basin. Bighorn Reservoir inflow for WY 2003 was second lowest on record with WY 2002 having the lowest. The reservoir also recorded the lowest pool of record since the lake filled in 1966. Water conservation was implemented at both projects with the total volume of water released in WY 2003 the lowest of record at both projects.

3 Actual 2001 April-July Boysen Reservoir inflow was 18% of normal. 4 Actual 2001 April-July Bighorn Reservoir inflow was 39% of normal.

K-6 APPENDIX K BUREAU OF RECLAMATION PROJECTS

4. Boysen Dam and Reservoir Operation Details. Figures K-1 and K-2 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 19,253 cfs Jun 23 67 14,204 cfs Jul 07 67 2nd 17,976 cfs Jun 17 63 10,688 cfs Jun 16 91 3rd 16,517 cfs Jun 15 91 9,512 cfs Jul 16 95

Pool-Date Highest 4730.83 Jul 06 67 2nd 4729.85 Jul 05 57 3rd 4729.18 Jun 16 91

b. Minimums of Record (since initial fill):

Pool-Date Lowest 4684.18 Mar 18-19 56 2nd 4686.42 Sep 21 60 3rd 4686.87 Sep 24 02

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow (AF) Total Outflow (AF) 540,829, 53% of normal 423,879, 42% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 6,043, June 01 1,372, June 01

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 4704.52, July 05 4686.87, September 24

K - 7 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-1 – BOYSEN DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-2 – BOYSEN DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K-8 APPENDIX K BUREAU OF RECLAMATION PROJECTS

5. Yellowtail Dam and Reservoir Operation Details. Figures K-3 and K-4 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 29,776 cfs Jul 01 67 24,721 cfs Jul 08 67 2nd 23,215 May 19 78 14,947 cfs Jul 03 70 3rd 21,006 cfs Jun 11 97 14,415 cfs Jul 19 95

Pool-Date Highest 3656.36 Jul 06 67 2nd 3651.71 Jul 14 97 3rd 3649.26 Jul 14 99

b. Minimums of Record (since initial fill):

Pool-Date Lowest 3572.81 Mar 11 03 2nd 3582.25 May 21 02 3rd 3583.30 Apr 14 89

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow (AF) Total Outflow (AF) 1,184,663, 49% of normal 1,054,370, 44% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 7,515, June 20 2,323, June 14

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 3616.02, July 07 3572.81, March 11

K - 9 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-3 – YELLOWTAIL DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-4 – YELLOWTAIL DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K-10 APPENDIX K BUREAU OF RECLAMATION PROJECTS

CANYON FERRY DAM AND RESERVOIR MISSOURI RIVER BASIN, MONTANA 2002-2003 REGULATION

1. General. Canyon Ferry Reservoir is regulated by the Bureau of Reclamation, except when the pool level rises into the exclusive flood control zone, or that portion of the joint use (conservation-flood control) zone required for flood control, as per the Field Working Agreement dated 23 May 1977. When this occurs, release determination is the responsibility of the Corps of Engineers.

2. Operation Details. Overall it was extremely dry in the upper Missouri River basin this year, however, the reservoir did enter the exclusive flood control zone (3797-3800 ft-msl) during June reaching a peak pool elevation of 3797.66 on June 25. During this period, an operating deviation was granted to allow the reservoir to store water in the exclusive fold control zone for a short time in order to conserve water as much as possible. Figures K-5 and K-6 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 35,330 cfs Jun 12 97 25,720 cfs Jun 13 81 2nd 29,055 cfs May 24 81 25,429 cfs Jun 22 97 3rd 28,752 cfs Jun 14 96 24,370 cfs Jun 19 64

Pool-Date Highest 3800.00 55, 56, 62, 64 2nd 3799.94 Oct 26 60 3rd 3799.93 65, 75

b. Minimums of Record (since initial fill):

Pool-Date Lowest 3764.70 Apr 11 67 2nd 3769.15 Apr 17 97 3rd 3772.75 Mar 25 62

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 2,696,724, 71% of normal 2,779,094, 73% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 20,361, Jun 02 9,958, Jun 04

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 3797.66, Jul 25 3786.84, Mar 10

K - 11 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-5 – CANYON FERRY DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-6 – CANYON FERRY DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K-12 APPENDIX K BUREAU OF RECLAMATION PROJECTS

CLARK CANYON DAM AND RESERVOIR BEAVERHEAD RIVER BASIN, MONTANA 2002-2003 REGULATION

1. General. Clark Canyon Reservoir (Hap Hawkins Lake) is regulated by the Bureau of Reclamation, except when the pool level rises into the exclusive flood control zone, or that portion of the joint use (conservation-flood control) zone required for flood control, as per the Field Working Agreement dated November 19, 1971. When this occurs, release determination is the responsibility of the Corps of Engineers.

3. Operation Details. Clark Canyon Reservoir did not enter the exclusive flood control zone (5546.1 ft-msl) during the report period. Clark Canyon reached a new record low pool elevation during the report period of 5491.33 on August 29, 2002. Figures K-7 and K-8 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 3,474 cfs Jun 22 84 2,586 cfs, Jun 25 84 2nd 2,800 cfs Jun 20 75 1,900 cfs, Aug 01 84 3rd 2,563 cfs Jun 06 95 1,538 cfs, Jul 26 95

Pool-Date Highest 5564.70 Jun 25 84 2nd 5556.88 Jul 22 75 3rd 5556.60 Aug 01 84

b. Minimums of Record (since initial fill):

Pool-Date Lowest 5491.33 Aug 29 02 2nd 5499.42 Aug 31 02 3rd 5508.67 Aug 23 89

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 106,553, 39% of normal 112,901, 41% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 296, Mar 14 810, Jun 12

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 5522.15, May 15 5491.33, Aug 29

K - 13 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-7 – CLARK CANYON DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-8 – CLARK CANYON DAM HISTORICAL POOL ELEVATION AND RELEASES.

K-14 APPENDIX K BUREAU OF RECLAMATION PROJECTS

GLENDO DAM AND RESERVOIR NORTH PLATTE RIVER BASIN, WYOMING 2002-2003 REGULATION

1. Description. Glendo Dam and Powerplant was constructed by the Bureau of Reclamation in October 1957 as part of the Missouri River Basin Project, Glendo Unit. The Glendo Unit provides irrigation, power generation, flood control, fish and wildlife enhancement, recreation, sediment retention, pollution abatement, and improvement of the quality of municipal and industrial water supply in the North Platte River valley between Gray Reef Dam and Glendo Reservoir.

Table K-13 shows Glendo Reservoir storage allocations from the 1975 resurvey.

TABLE K-13 GLENDO RESERVOIR STORAGE ALLOCATIONS Pool Elevation Zone Capacity Cum Capacity Storage Zones (ft above msl) (acre-feet) (acre-feet) Dead 4508-4545 11,033 11,033 Irrigation 4545-4570 53,115 63,148 Conservation 4570-4635 454,337 517,485 Flood Control5 4635-4653 271,917 789,402 Surcharge 4653-4669 329,251 1,118,653

2. Water Control Plan. The general objectives of the water control plan as described in paragraph 7-01 of the Glendo Dam and Reservoir water control manual calls for the District Engineer (Corps) to make discharges from Glendo Dam “considered necessary based on known hydrologic conditions at the time with the objective of prevention of reduction of flood damages along the North Platte River in Wyoming and Nebraska from Glendo Dam to Lake McConaughy (Kingsley Dam).”

3. Inflow Forecasts. Table K-19 lists the April-June inflow forecasts for Glendo Reservoir. The inflow forecasts are based on historical antecedent conditions, snowpack and precipitation versus actual inflow. Both the USBR and the Corps independently calculate monthly forecasts. There were no flood control activities at Glendo Reservoir during the rating period.

TABLE K-19 2002 GLENDO APRIL-JUNE INFLOW FORECASTS April - June % of normal (156.9 KAF) Agency Feb 1 Mar 1 Apr 1 May 1 Jun 1 Corps 45 43 56 54 45 USBR 21 35 71 95 N/A Actual 47* * Actual Glendo inflow represents total net inflow to Glendo (Glendo inflow minus releases from Alcova Dam) (270,000 AF – 196,000 AF).

5 Waters stored in the flood control zone of Glendo Reservoir are released under regulations prescribed by the Secretary of the Army under authority of the Flood Control Act of 1944. K - 15 APPENDIX K BUREAU OF RECLAMATION PROJECTS

4. Reservoir Regulation. Several considerations are given in determining releases from Glendo Dam: 1) incremental inflows downstream of Glendo Dam and upstream of the re-regulating Guernsey Dam, which has a total storage capacity of only 30,000 acre- feet; 2) downstream irrigation canal diversions from the North Platte River; 3) releases from Grayrocks Dam on the Laramie River; and 4) incremental inflows between Guernsey Dam and the Nebraska communities along the North Platte River including Mitchell, Scottsbluff, Bridgeport, Lisco and Lewellen.

5. Operation Details. Figures K-9 and K-10 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 18,840 cfs May 15 65 10,214 cfs Jun 30 84 2nd 17,560 cfs Jun 13 70 10,060 cfs Aug 26 83 3rd 14,661 cfs May 21 73 9,644 cfs Jun 02 73

Pool-Date Highest 4650.94 May 28 73 2nd 4650.27 Jun 14 83 3rd 4649.08 May 24 71

b. Minimums of Record (since initial fill):

Pool-Date Lowest 4548.10 Sep 28 66 2nd 4560.42 Sep 26 72 3rd 4560.73 Sep 29 69

c. Report Period (August 1, 2002 through July 31, 2003):

Total Inflow (AF) Total Outflow (AF) 757,953, 64% of normal 579,509, 50% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 3,268, June 29 7,477, July 31

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 4631.11, June 20 4572.05, August 18

K-16 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-9 – GLENDO DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-10 – GLENDO DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K - 17 APPENDIX K BUREAU OF RECLAMATION PROJECTS

HEART BUTTE DAM AND RESERVOIR (LAKE TSCHIDA) HEART RIVER BASIN, NORTH DAKOTA 2002-2003 REGULATION

2. General. Heart Butte Reservoir is regulated by the Bureau of Reclamation except when the pool level rises into the exclusive flood control zone. When this occurs, release determination is the responsibility of the Corps of Engineers as per the Field Working Agreement dated 15 March 1951.

The capacity of the spillway at the top of the flood control pool is 4,450 cfs. This discharge is well within the downstream channel capacity.

2. Operation Details. A rainfall event that fell on frozen ground in the upper basin produced significant runoff into Heart Butte Reservoir in early spring. This caused the pool level to rise into the flood control zone this year. Dry conditions prevailed for the remainder of the reporting period. Figures K-11 and K-12 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 22,092 cfs May 09 70 4,100 cfs Apr 09 52 2nd 21,662 cfs Apr 17 50 3,932 cfs Apr 01 78 3rd 15,114 cfs Mar 21 97 3,864 cfs May 13 70

Pool-Date Highest 2086.23 Apr 09 52 2nd 2083.77 Mar 31 78 3rd 2082.70 May 12 70

b. Minimums of Record (since initial fill): Pool-Date Lowest 2049.00 Oct 25 91 2nd 2049.16 Oct 12 92 3rd 2051.44 Nov 07 90

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 65,616, 75% of normal 62,252, 72% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 6,303, Mar 19 3,108, Mar 21

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 2070.32, Mar 20 2059.61, Sep 27

K-18 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-11 – HEART BUTTE DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-12 – HEART BUTTE DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K - 19 APPENDIX K BUREAU OF RECLAMATION PROJECTS

JAMESTOWN DAM AND RESERVOIR JAMES RIVER BASIN, NORTH DAKOTA 2002-2003 REGULATION

1. General. Jamestown Reservoir is regulated by the Bureau of Reclamation except when the pool level rises into the exclusive flood control zone or that portion of joint use conservation-flood control zone required for flood control. When this occurs, release determination is the responsibility of the Corps of Engineers. Pipestem Reservoir is operated jointly with Jamestown Reservoir for flood control. A new water control plan was finalized at the end of 2002. This plan was the product of a study initiated in 1996. This new plan has been followed for the last several years. Details of this plan are contained in the study write-up “Jamestown and Pipestem Reservoirs Water Control Plan Review and Update, July, 2000”. For a description of the joint operation of Jamestown and Pipestem Reservoirs, refer to the Pipestem Reservoir narrative located in Appendix C of this report.

2. Operation Details. Figures K-13 and K-14 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 7,689 cfs Apr 17 69 1,702 cfs May 02 97 2nd 5,808 cfs Apr 22 97 1,169 cfs May 13 96 3rd 5,029 cfs Apr 18 96 1,152 May 04 2001

Pool-Date Highest 1445.70 May 02 97 2nd 1444.90 Apr 25 96 3rd 1444.10 Apr 27 69 (USBR 1443.80 May 02 69)

b. Minimums of Record (since initial fill):

Pool-Date Lowest 1420.91 Mar 03 93 2nd 1421.85 Jul 31 92 3rd 1423.53 Jul 31 91

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 22,665, 53% of normal 22,914, 55% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 564, Jun 26 200, May 30

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 1432.47, May 22 1428.83, Feb 17 K-20 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-13 – JAMESTOWN DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-14 – JAMESTOWN DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K - 21 APPENDIX K BUREAU OF RECLAMATION PROJECTS

KEYHOLE DAM AND RESERVOIR BELLE FOURCHE RIVER BASIN, WYOMING 2002-2003 REGULATION

1. General. Keyhole Reservoir is regulated by the Bureau of Reclamation except when the pool level rises into the exclusive flood control zone as per the Field Working Agreement dated 11 February 1970. When this occurs, release determination is the responsibility of the Corps of Engineers.

2. Operation Details. Conditions above Keyhole Reservoir were very dry. The pool level did not reach the top of conservation zone (4099.3). Figures K-15 and K-16 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 10,664 cfs May 19 78 1,347 cfs May 24 78 2nd 5,198 cfs Mar 13 96 825 cfs May 23-24 62 3rd 4,778 cfs Feb 29 72 800 cfs Mar 11-15 72

Pool-Date Highest 4100.38 May 21 78 2nd 4099.06 Jun 14 99 3rd 4098.78 Mar 07 72

b. Minimums of Record (since initial fill):

Pool-Date Lowest 4060.32 Nov 01 92 2nd 4063.86 Jul 22-23 92 3rd 4066.94 Dec 12-22 90

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 12,760, 64% of normal 17,120, 115% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 1,450, March 14 150, July 03

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 4092.32, July 01 4089.15, November 21

K-22 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-15 – KEYHOLE DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-16 – KEYHOLE DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K - 23 APPENDIX K BUREAU OF RECLAMATION PROJECTS

PACTOLA DAM AND RESERVOIR RAPID CREEK BASIN, SOUTH DAKOTA 2002-2003 REGULATION

1. General. Pactola Dam and Reservoir is regulated by the Bureau of Reclamation except when the pool level rises into the exclusive flood control zone as per the Field Working Agreement dated 27 August 1969. When this occurs, release determination is the responsibility of the Corps of Engineers.

Operation Details. Pactola Reservoir just nudged into the flood control zone in May, June, and July of the report period. Releases were made using the plan of regulation contained in the November 1976, Report in Reservoir Regulations for Flood Control. The plan is shown in Table K-20.

Additional considerations TABLE K-20 when setting the releases PACTOLA RESERVOIR are as follows: FLOOD CONTROL RELEASE SCHEDULE Reservoir Elevation (ft-msl) Required release · As much as possible From To (cfs) the flow at Canyon 4580.20 4582.00 Inflows up to 250 Lake is targeted at 600 4582.01 4583.00 300 cfs. Flows above this 4583.01 4585.00 400 level adversely affect 4585.01 4590.00 500 recreational facilities

located along Rapid Creek through Rapid City. · The Pactola Reservoir and National Forest Service boat ramps are affected by pool levels over a few feet above elevation 4580.0 ft-msl.

Figures K-17 and K-18 detail historical and reporting period releases and pool elevations.

K-24 APPENDIX K BUREAU OF RECLAMATION PROJECTS

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 1,132 cfs May 16 65 500 cfs May 20 65 2nd 1,009 cfs Jun 19 98 438 cfs Jun 02 96 3rd 741 cfs May 31 96 438 cfs Jun 23 98

Pool-Date Highest 4585.87 May 19 65 2nd 4585.44 May 21 78 3rd 4585.35 Jun 04 96

b. Minimums of Record (since initial fill):

Pool-Date Lowest 4531.53 Jan 24 91 2nd 4533.12 Feb 21 90 3rd 4539.94 Jul 31 89

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 29,082, 79% of normal 26,462, 74% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 160, May 10 110, June 19

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 4580.71, June 17 4568.00, September 30

K - 25 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-17 – PACTOLA DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-18 – PACTOLA DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K-26 APPENDIX K BUREAU OF RECLAMATION PROJECTS

SHADEHILL DAM AND RESERVOIR GRAND RIVER BASIN, SOUTH DAKOTA 2002-2003 REGULATION

1. General. Shadehill Reservoir is regulated by the Bureau of Reclamation except when the pool level rises into the exclusive flood control zone as per the Field Working Agreement dated 15 May 1972. When this occurs, release determination is the responsibility of the Corps of Engineers. Shadehill Reservoir experienced no flood control activities during the reporting period.

2. Operation Details. Figures K-19 and K-20 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 32,152 cfs Apr 08 52 5,078 cfs Apr 10 52 2nd 11,333 cfs Mar 22 97 4,120 cfs Apr 03 78 3rd 9,690 cfs Mar 30 78 4,038 cfs Mar 24 97

Pool-Date Highest 2297.90 Apr 10 52 2nd 2282.42 Apr 02 78 3rd 2280.01 Mar 24 97

b. Minimums of Record (since initial fill):

Pool-Date Lowest 2258.62 Nov 17 81 2nd 2258.90 Mar 17 62 3rd 2259.33 Apr 17 64

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 8,640, 12% of normal 15,380, 22% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 845, Mar 18 23, Aug 02

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 2264.57, Aug 01 2261.17, Jan 31

K - 27 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-19 – SHADEHILL DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD.

FIGURE K-20 – SHADEHILL DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K-28 APPENDIX K BUREAU OF RECLAMATION PROJECTS

TIBER DAM AND RESERVOIR (LAKE ELWELL) MARIAS RIVER BASIN, MONTANA 2002-2003 REGULATION

1. General. Tiber Reservoir is regulated by the Bureau of Reclamation except when the pool level rises into the flood control zone or that portion of the joint use (conservation-flood control) zone required for flood control as per the Water Control Agreement. When this occurs, release determination is the responsibility of the Corps of Engineers. When replacement storage is required for the downstream Fort Peck Reservoir, releases from Tiber Dam will be adjusted beginning 1 March, based on anticipated inflow, to fill the flood control storage zone to elevation 3008.1 ft-msl prior to mid-July. Minimum releases to achieve this fill are 300 cfs.

Operation Details. The pool level at Tiber Reservoir never entered the flood control zone. Figures K-22 and K-23 detail historical and reporting period releases and pool elevations.

a. Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 102,888 cfs Jun 10 64 10,300 cfs Jun 13-14 64 2nd 52,981 cfs Jun 21 75 7,989 Aug 12 64 3rd 26,391 cfs Feb 26 86 5,777 cfs Jun 25 75; Jul 11 75

Pool-Date Highest 3005.59 Jul 12 65 2nd 3003.80 Aug 01 65 3rd 3001.91 Jun 13 64

b. Minimums of Record (since initial fill):

Pool-Date Lowest 2953.81 Mar 31 68 2nd 2955.25 Apr 28 67 3rd 2956.31 Mar 14 69

c. Report Period: (August 1, 2002 through July 31, 2003)

Total Inflow (AF) Total Outflow (AF) 441,395, 72% of normal 460,987, 77% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 3,174, May 27 1,109, Aug 05

Peak Pool Elevation (FT-MSL) Minimum Pool Elevation (FT-MSL) 2991.78, Jun 26 2980.46, Mar 14 K - 29 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-21 – TIBER DAM POOL ELEVATION, DISCHARGE, INFLOW, AND BASE OF LOCAL FLOOD CONTROL POOL.

FIGURE K-22 – TIBER DAM POOL ELEVATIONS AND RELEASES FOR REPORT PERIOD. K-30 APPENDIX K BUREAU OF RECLAMATION PROJECTS

FIGURE K-23 - TIBER DAM HISTORICAL POOL ELEVATIONS AND RELEASES.

K - 31 APPENDIX K BUREAU OF RECLAMATION PROJECTS

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