Annual Report- 1994

US Army Corps of Engineers Omaha District

Annual Report- 1994

Tributary Reservoir Regulation Activities

{August 1993 - July 1994)

Prepared by: Water Control Section Hydrologic Engineering Branch Engineering Division Omaha, Nebraska

December 1994 MISSOURI RIVER DIVISION OMAHA DISTRICT SUMMARY OF 1993-1994

I. PURPOSE AND SCOPE ...... 1

II. REFERENCES ...... 1

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

IV. TRIBUTARY RUNOFF ...... 3

V. RESERVOIR ACCOMPLISHMENTS ...... 11 a. Flood Damages Prevented ...... 11 b. Recreation Usage ...... 11

VI. RESERVOIR OPERATION ...... 11 a. Previous Years Operation (August 1, 1993 through July 31, 1994) . . . . 11 (1) Corps of Engineers Lakes ...... 11 (a) Bear Creek Reservoir, Colorado ...... 11 (b) Chatfield Reservoir, Colorado ...... 18 (c) Cherry Creek Reservoir, Colorado ...... 18 (d) Bowman-Haley, North Dakota ...... 18 (e) Pipestem, North Dakota ...... 18 (f) Papillion Creek Basin, Nebraska ...... 19 (g) Salt Creek Basin, Nebraska ...... 19 (2) Bureau of Reclamation Dams ...... 19 Jamestown Dam, North Dakota ...... 19 (b) Proposed Operations ...... 19 (1) Corps of Engineers ...... 19 (a) North Dakota ...... 20 (b) South Dakota ...... 20 (c) Colorado ...... 25 (d) Nebraska ...... 25 (2) Bureau of Reclamation ...... 25 (a) Canyon Ferry ...... 25 (b) Tiber ...... 26 (c) Yellowtail ...... 26 (d) Others ...... 26

VII. MAJOR REGULATION PROBLEMS ...... 26 a. Water Quality ...... 26 b. Downstream Channel Capacity ...... 26 c. Releases for Purposes other than Authorized Project Functions ...... 27 d. Potential Hazardous Conditions ...... 27 e. Dam Safety Issues ...... 27 (1) Corps of Engineers Dams ...... 27 (a) Cherry Creek Dam ...... 27 (b) Coldbrook Dam ...... 27 (2) Bureau of Reclamation Dams ...... 28 (a) Clark Canyon Dam ...... 28 (b) Canyon Ferry Dam ...... 28 (c) Tiber Dam ...... 28 (d) Boysen Dam ...... 28 (e) Yellowtail Dam ...... 28 (f) Heart Butte Dam ...... 28 (g) Jamestown Dam ...... 28 (h) Keyhole Dam ...... 28 (i) Pactola Dam ...... 29 0) Shadehill Dam ...... 29 (k) Glendo Dam ...... 29

VIII. WATER CONTROL MANUALS ...... 29

IX. DATA COLLECTION PROGRAM AND PROCEDURES ...... 30 a. Collection of Water Control Data ...... 30 b. Automated Remote Sensors ...... 30 c. Cooperative Hydrologic Programs ...... 34 d. Water Quality ...... 34 e. Sediment ...... 35

X. FLOODING ...... 35 a. Nebraska ...... 35 b. Iowa ...... 37 c. Colorado ...... 41 d. South Dakota...... 41 e. North Dakota ...... 41 f.M~~a ...... ~ g. Wyoming ...... 42

XI. WATER CONTROL INITIATIVES ...... 43

XII. FERC Applications ...... 43

XIII. TRAINING AND METHODS ...... 43

ii TABLES PAGE

1. Percentage of Normal Runoff for August 1, 1993 to July 31, 1994 4-5

2. 1994 Water Year Peak Stages and Discharges 8-10

3. Flood Damages Prevented FY 1994 12-14

4. Recreation Visitation in Hours 15

5. Utilization of Exclusive Flood Storage Zone 16

6. Work Priorities 32

7. Status of Water Control Manuals 33-34

FIGURES

1. Long Term Palmer Drought Severity Maps 1991 and 1992 6

2. Long Term Palmer Drought Severity Maps 1993 and 1994 7

PLATES

1. Pipestem Dam Pool Elevation and Release 21

2. Jamestown Dam Pool Elevation and Release 22

3. Combined Releases for Pipestem and Jamestown Dams 23

4. Unregulated & Actual Observed Flows at Jamestown Gage 24

APPENDIXES

1. Map of Flood Control Dams

2. Project Data Sheets 2-1

3. Regulation Sheets for Past Year

iii CORPS OF ENGINEERS PROJECTS:

(1) Bear Creek Dam and Lake 3.1

(2) Bowman-Haley Dam and Lake 3.6

(3) Bull Hook-Scott Coulee Dams 3.9

(4) Cedar Canyon Dam (Red Dale Gulch) 3.10

(5) Chatfield Dam and Lake 3.11

(6) Cherry Creek Dam and Lake 3.15

(7) Coldbrook Dam and Lake 3.20

(B) Cottonwood Springs Dam and Lake 3.23

(9) Kelly Road Dam 3.26

(1 O) Westerly Creek Dam 3.27

(11) Glenn Cunningham Dam and Lake 3.28

(12) Standing Bear Dam and Lake 3.31

(13) Zorinsky Dam and Lake 3.34

(14) Wehrspan Dam and Lake 3.37

(15) Pipestem Dam and Lake 3.40

(16) Olive Creek Dam and Lake 3.43

(17) Bluestem Dam and Lake 3.46

(18) Wagon Train Dam and Lake 3.49

(19) Stagecoach Dam and Lake 3.52

(20) Yankee Hill Dam and Lake 3.55

(21) Conestoga Dam and Lake 3.58

iv (22) Twin Lakes Dam and Lake 3.61

(23) Pawnee Dam and Lake 3.64

(24) Antelope Creek Dam and Holmes Park Lake 3.67

(25) Branched Oak Dam and Lake 3.70

(26) Snake Creek Dam and Lake Audubon 3.73

(27) Spring Creek Dam and Lake Pocasse 3.76

NON-CORPS PROJECTS

(1) Boysen Dam 3.79

(2) Canyon Ferry Dam 3.82

(3) Clark Canyon Dam 3.85

(4) Glendo Dam 3.88

(5) Heart Butte Dam 3.92

(6) Jamestown Dam 3.95

(7) Keyhole Dam 3.99

(8) Pactola Dam 3.102

(9) Shadehill Dam 3.105

(1 0) Tiber Dam 3.108

(11) Yellowtail Dam 3.112

v This report is the Omaha District's portion of the Missouri River Division's 1993-1994 Annual Report on Reservoir Regulation Activities MISSOURI RIVER DIVISION OMAHA DISTRICT SUMMARY OF 1993-1994

I. PURPOSE AND SCOPE. This annual report summarizes significant tributary reservoir regulation activities and tributary flooding within the geographic boundaries of the Omaha District. The period covered by this report is 1 August 1993 through 31 July 1994 and is referred to as the report period.

II. REFERENCES.

a. ER 1110-2-1400, 24 April1970.

b. ER 1110-2-240, 8 October 1982.

c. Missouri River Division Letter, 1 October 1970, subject: Reservoir Regulation Reports.

Ill. 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 above Rulo, Nebraska.

a. Reservoirs with Flood Control Storage. There are 36 tributary reservoirs with allocated flood control storage covered in this report. The dams are listed on the following page. Included are 25 Corps of Engineers dams and 11 Bureau of Reclamation dams. The locations of these 36 tributary reservoirs are shown in Appendix 1 and pertinent data are presented in Appendix 2. CORPS OF ENGINEERS DAMS 1. Bear Creek Dam, CO 14. Papillion No. 20, NE (Wehrspann)

2. Bowman-Haley Dam, ND 15. Pipestem Dam, ND

3. Bull Hook Dam, MT 16. Salt Creek No. 2, NE (Olive Creek)

4. Cedar Canyon Dam, SD 17. Salt Creek No. 4, NE (Blue Stem)

5. Chatfield Dam, CO 18. Salt Creek No. 8, NE (Wagon Train)

6. Cherry Creek Dam, CO 19. Salt Creek No. 9, NE (Stagecoach)

7. Westerly Creek Dam, CO 20. Salt Creek No. 10, NE (Yankee Hill)

8. Coldbrook Dam, SD 21. Salt Creek No. 12, NE (Conestoga)

9. Cottonwood Springs, Dam, SD 22. Salt Creek No. 13, NE (Twin)

10. Kelly Road Dam, CO 23. Salt Creek No. 14, NE (Pawnee)

11. Papillion No. 11, NE (Glen Cunningham) 24. Salt Creek No. 17, NE (Holmes Park)

12. Papillion No. 16, NE (Standing Bear) 25. Salt Creek No. 18, NE (Branched Oak)

13. Papillion No. 18, NE (Zorinsky)

BUREAU OF RECLAMATION DAMS 1. Boysen Dam, WY 7. Keyhole Dam, WY

2. Canyon Ferry Dam, MT 8. Pactola Dam, SD

3. Clark Canyon Dam, MT 9. Shadehill Dam, SD

4. Glendo Dam, WY 10. Tlber Dam, MT

5. Heart Butte Dam, ND 11. Yellowtail Dam, MT

6. Jamestown, ND

b. Reservoirs without Flood Control Storage. There are two Corps of Engineers tributary lakes without allocated flood control storage included in this report. Both are subimpoundment of the Missouri River Main Stem Projects and were formed by the construction of relocations for transportation facilities and utilities. Lake Audubon, a subimpoundments of Lake Sakakawea, is located just northeast of Riverdale, North Dakota. Lake Audubon and Snake Creek Pumping Plant were to be major facilities of the Bureau of Reclamation's proposed Garrison Diversion Unit (GDU) Project. Lake Pocasse, a subimpoundment of Lake Oahe, is located near Pollock, South Dakota. The Bureau of Reclamation planned to use this lake as a regulating reservoir for the proposed Pollock-Harried Irrigation Unit. The development of this unit, however, has not materialized. Both lakes are used for fish and wildlife and recreational purposes. Their locations are shown on Appendix 1 and pertinent data are presented in Appendix 2.

2 IV. TRIBUTARY RUNOFF.

Tributary flows during the report period were near normal or above normal in most of the basin. Table 1 presents calculated percentages of normal runoff at pertinent locations within the basin. The Long Term Palmer Reports for Drought Severity from years 1991 through 1994 are shown on Figures 1 and 2. Table 2 lists peak discharges at selected gaging stations including many reservoir release control points used by the Omaha District.

Areas of extremely low runoff (less than 50% of normal) occurred in the Bear Creek basin and the South Platte River basin above Chatfield Dam in Colorado.

Areas of 50% to 70% of normal runoff were the upper Wind River basin in western Wyoming above Boysen Reservoir and the Heart River basin in North Dakota.

River basins that experienced 70% to 100% of normal runoff were the Cherry Creek basin in Colorado, the upper Missouri River basin and the Marias River basin in western Montana, the Bighorn River basin in central Wyoming, and the Salt Creek basin above Salt Creek Dam 12 in Nebraska.

The four Papillion Creek Dams in the Omaha, Nebraska area experienced runoffs ranging from 104% to 220%. Nine of the ten Salt Creek Dams in the Lincoln, Nebraska area experienced from 114% to 197% of normal runoff.

The Pipestem Creek basin and the James River basin in eastern North Dakota recorded runoff of 255% and 556% of normal, respectively.

Basins that experienced runoffs from 101% to 200% include the Grand River basin in western North Dakota, the upper Missouri River above Canyon Ferry Dam in western Montana, the Belle Fourche River basin in western South Dakota the Grand River basin in western South Dakota and the Rapid Creek basin in western ·South Dakota.

3 TABLE 1

Percentage of Normal Runoff for Period (August 1, 1993 to July 31, 1994) AVERAGE INFLOW INFLOW ACRE-FEET ACRE-FEET %OF AVERAGE Bowman-Haley Dam 20,990 20,237 104 Bear Creek Dam 17,670 36,070 49 Chatfield Dam 78,581 164,703 48 Cherry Creek Dam 7,653 7,716 99 Coldbrook Dam 1,106 564 196 Papio Dam 11 8,032 7,692 104 Papio Dam 16 1,975 1 '143 173 Papio Dam 18 6,128 4,997 123 Papio Dam 20 4,922 2,234 220 Pipestem Dam 70,588 27,650 255 Salt Creek Dam 2 3,468 2,293 151 Salt Creek Dam 4 6,640 4,234 157 Salt Creek Dam 8 6,915 4,423 156 Salt Creek Dam 9 5,173 2,848 182 Salt Creek Dam 10 9,267 5,163 179 Salt Creek Dam 12 4,540 5,862 77 Salt Creek Dam 13 6,216 4,198 148 Salt Creek Dam 14 9,416 8,241 114 Salt Creek Dam 17 5,188 2,640 197 Salt Creek Dam 18 47,731 29,654 161 TOTAL: 322,199 342,562 94

- ::::_ - ---"------. ·-· ' TABLE 1 {Continued)

BUREAU OF RECLAMATION Boysen Dam 671,496 1,021,797 66 Canyon Ferry Dam 328,384 398,151 110 Clark Canyon Dam 212,121 281,310 75 Glendo Dam 939,252 1,190,998 79 Heart Butte Dam 52,261 93,572 56 Jamestown Dam 179,096 32,187 556 Keyhole Dam 50,159 32,763 153 Pactola Dam 40,264 33,190 121 Shadehill Dam 139,008 73,959 188 Tiber Dam 500,085 660,580 76 Yellowtail Dam 1,823,590 2,474,136 74 TOTAL: 4,935,716 6,292,643 78

5 DROUGHT SEVERITY (LONG n:RM, PALMER)

DROUGHT SEVERiTY (LONG TERM. pALMER) Odober 3, 1992

6 F:..GUR~ 1 DROUGHT SEVERITY (LONG TERM, PALMER) Oc:lober 2, 1993

NOAMJSOA JOJ.IT AGRK:\Il TURAL WEATHER FACLITY

DROUGHT SEVERITY (LONG TERM, PALMER) October 29, 1994

NOAMJSOA. JOINT AGRICULTURAL WEATHER FACILITY

7 FIGURE 2 TABLE 2 94peaks.ws 1994 WATER YEAR PEAK STAGES AND DISCHARGES

Haxirrun Haxii1UII 1994 """"" Fl ood Comnents DRAINAGE FLOOD AREA RECORD STAGE STAGE DISCHARGE STAGE DISCHARGE STREAM STATION (Sq Mil SINCE (Ft) DATE ( Ft) (cfsl DATE ( Ftl (cfsl UPPER MISSOURI RIVER BASIN

Red Rock River below Lima Res., MT 570 1911 • 1. 1 02Jun1994 3.53 623 15May1993 5.40 2,500 Beaverhead River at Twin Bridges, MT 3,619 1935 • 5.2 04Apr1994 5.10 450 12May1944 5.12 3,130 Jefferson River at Three Forks, MT 9,532 1978 n/a 02Mar1994 6.06 6,673 24May1981 8.06 15,900 Madison River at McAllister, MT 2,186 1901 4.4 14Nov1993 4.50 3,103 12Jun1970 8.01 9,550 Gallatin River at Logan, MT 1,795 1893 • 7.5 28Nov1993 10.00 12,300 21Jun1899 nr 9,840 Missouri River at Toston, MT 14,669 1890 • 10.0 26Apr1994 6.59 8,696 06Jun1948 11.77 32,000 Missouri River at Ulm, MT 20,941 1957 13.0 11Jan1994 9.58 14,120 Jun1953 17.00 35,000 Soo River at Vaughn, MT 1,854 1897 • 10.0 14May1994 5.51 3,518 09Jun1964 23.40 53,500 Missouri River at Virgelle, MT 34,379 1935 17.0 23Jan1994 17.12 73,683 05Jun1953 23.40 122,000 Missouri River at landusky, MT 40,987 1934 n/a 04Mar1994 26.94 41,329 06Jun1953 nr 137,000 Milk River at Havre, MT 5,785 1899 • 10.0 07Mar1994 12.81 7,000 12Apr1899 nr 20,000 Milk River nr Saco, HT 17,670 1977 20.0 16Mar1994 19.27 5,948 03Apr1979 24.20 12,400 Max gh = 26.7' 04Mar1986 ice Milk River at Nashua, MT 22,332 1939 20.0 21Mar1994 18.15 7,910 18Apr1952 31.38 45,300 Max gh of 1994 backwater affected Missouri River nr l«Jlf Point, MT 82,290 1928 10.9 310ec1993 9.57 32,915 25Mar1939 14.40 66,800 Missouri Rl ver at Culbertson. HT 91,557 1941 • 19.0 07Mar1994 11.80 36,011 26Mar1943 15.12 78,200 Musselshell River at Roundup, MT 4,023 1946 5.1 01Aug1993 4.11 1,027 18Jun1967 12.45 9,610 Yellowstone River at Billings, HT 11,795 1904 • 13.0 14May1994 9.53 29,446 1918 nr 78,100 co Wind River at Riverton, WY 2,309 1906 8.0 14May1994 5.94 2,350 15Jun1935 10.15 13,300 Hax gh = 10.80 30Dec1983 ice \.lind River below Boysen Res., WY 7,701 1951 n/a 29Har1994 9.48 6,690 07Jul1967 13.35 13.500 Bighorn River at Kane, t.IY 15,765 1928 8.0 30Har1994 4.78 6,364 16Jun1935 11.10 25,200 Bigham River at Bighom, WY 22,414 1956 17.0 28Feb1994 7.55 18,175 20May1978 nr 59,200 At previous location Yellowstone River at Hiles City, HT 48,253 1922 13.0 03Mar1994 16.16 97,122 22May1978 16.50 102,000 Tongue River at Hiles City, HT 5,379 1938 • 5.8 05Har1994 10.96 7,663 15Jun1962 11.33 13,300 Powder River at locate, HT 13,194 1938 8.4 05Har1994 14.16 22,339 19Feb1943 11.23 31,000 Yellowstone River at Sidney, HT 69,103 1910 19.0 06Har1994 23.97 143,386 21Jun1921 nr 159,000 Knife River at Hazen, NO 2,240 1928 • 12.0 16Har1994 14.00 2,952 24Jun1966 27.01 35,300 Missouri River at Bismarck, NO 186,400 1927 16.0 28Nov1993 13.53 63,530 06Apr1952 27.90 500,000 Heart River at Mandan, NO 3,310 1924 • 17.0 09Feb1994 33.35 34,070 19Apr1950 23.64 30,500 Cannonball River at Brei en, NO 4,100 1934 10.0 13Dec1993 23,975 19Apr1950 22.30 94,800 Max gh of 1994 backwater affected N Fork Grand River at Haley, NO 509 1908 • 17.0 09Har1994 8.96 135 07Apr1952 17.03 14,100 GrNid Rlver at little Eagle, so 5,370 1958 15.0 10Feb1994 29.39 39,168 23Mar1987 19.16 31,000 Moreau River at ~itehorse, SO 4,880 1954 21.0 05Har1994 16.83 10,134 24Hay1982 26.00 27,700 Belle Fourche River at WY-SO State line 3,280 1946 14.0 03Mar1994 11.12 1,500 18Jun1962 15.59 4,400 Fall River at Hot Springs. SO 137 1937 13.0 13May1994 2.81 46 04Sep1938 18.40 13,100 Site and datum then ln use Rapid Creek at Rapid City, so 410 1942 7.0 03Hay1994 5.78 589 09Jun1972 19.66 50,000 Cheyenne River at Wasta, SO 12,800 1928 16.0 19Sep1993 5.97 5,309 06Hay1932 13.28 46,300 Cheyenne River at Cherry Creek, SO 23,900 1960 14.0 08Jun1994 11.99 16,968 22Hay1982 15.77 55,900 8ad River at Ft. Pierre. so 3,107 1928 21.0 20Jan1994 33.09 42,377 Jul1905 32.90 70,000 \.thlte River at Oacoma, SO 10,200 1928 n/a 04Har1994 24.71 25,000 30Mar1952 15.40 51,900 Hax gh ~ 24.71; ice affected Niobrara River at Verde(, NE 12,600 1958 12.0 250ct1993 28.00 198,407 27Mar1960 10.10 39,000 TABLE 2 1994 WATER YEAR PEAK STAGES AND DISCHARGES (continued)

Hax\nun Haxinun 1994 Known Flood Con'ments DRAINAGE FUlOO AREA RECORD STAGE STAGE DISCHARGE STAGE DISCHARGE STREAM STAT! Oil (Sq Mil SINCE ( Ftl DATE (Ft) (efs) DATE (Ft) lcfsl LCio/ER MISSOURI RIVER BASIN

Vermillion River nr vermillion, so 2,302 1983 21.0 09Hor19'14 16.08 3,237 23Jun1984 31.77 21,400 Max gh of 1994 backwater affected Pipestem Creek nr Pingree, NO 700 1973 10.0 23Hor 19'14 10.88 2,337 20Apr1979 11.60 2.520 Hax gh of 1994 backwater affected James River nr Grace City, NO 1,060 1968 12.0 01Aug1993 11.06 2,128 28Jul1993 13.82 3.786 Previous hi 12.0'/3100 5-13-69 James River at Jamestown, NO 2,820 1928 12.0 29Aug1993 10.28 1,041 13Hoy1950 15.82 6,390 Ja.s River at lamoure, NO 4,390 1957 14.0 24Har1994 14.18 1,961 14Apr1969 16.17 6,800 Janes R\ver at Coll.ldlia, SO 7,393 1988 11.0 27Apr1994 15.57 1,350 24Hay195D 16.89 5,420 Max gh • 17.11' 24Har1987 Janes River at Ashton, SO 9,742 1945 13.0 021\pr1994 16.23 2,410 24Apr1969 20.63 5,680 Haxgh•21.17' 13Apr69 bckwtr James River nr SCotland, SO 20,653 1928 13.0 28Hor1994 16.82 6,963 23Jun1984 20.45 29,400 Big Sioux River at Watertown, SO 1,007 1972 6.6 20Hor1994 9.86 2,110 30Hor1986 11.08 4,970 Big Sioux River at Dell Rapids, SO 4,483 1948 12.0 25Jun1994 12.76 5,259 09Apr1969 16.47 41,300 Max gh of 1994 backwater affected Skunk Creek at sioux Falls, so 622 1948 n/a 10Feb1994 24.42 21,689 17Jun1957 nr 29,400 Big Sioux River at Sioux Falls, so 5,216 1962 16.0 18Jun1994 22.43 15, 177 10Apr1969 27.45 40.700 Jmck. River at Rock Valley, !A 1,592 1948 16.0 14Jun1994 16.38 24,630 07Apr1969 17.32 40,400 Big Sioux River at Akron, lA 6,424 1928 16.0 16Jun19'14 21.10 22,784 09Apr1969 22.99 80,800 Missouri River at Siowc City, !A 314,600 1897 36.0 14Feb19'14 30.37 100,564 14Apr1952 24.28 441,000 S i te and da tlln then 1n use \0 Perry Creek at Sioux City, !A 65 1945 • 15.5 18Feb19'14 16.86 2,846 19Hay1990 26.54 8,670 Floyd River at Al too, IA 268 1955 12.0 13Jun19'14 17.30 6,400 20Jun1983 16.54 16,300 Floyd River at James, IA 686 1934 26.0 24Jun19'14 17.21 5,405 08Jun1953 25.30 71,500 Missouri River at Decatur, NE 316,200 1987 23.2 07Hor19'14 28.10 54,106 16Jul1993 32.04 75,402 Previous hi 25.6'/40900 5-19-90 Little Sioux River at linn Grove, lA 1,548 1927 20.0 26Jun1994 17.47 9,075 02Jul19'13 20.69 17,399 Previous hi 19.6'/13100 6-17-64 Little Sioux River at COrrectionville, lA 2,500 1918 • 19.0 29Jun1994 17. 11 9,215 07Apr.1965 25.66 29,800 west Fork Oitch at Hornick, lA 403 1939 20.0 24Jun1994 18.79 4,210 28Har1962 22.46 12,400 Little Sioux River nr Turin, lA 3,526 1956 20.0 26Jun1994 17.90 11,097 21Jun1963 26.54 31,200 Max gh"" 27.44' 19Feb1971 ice Maple River at Hapletoo, !A 669 1941 • 16.0 18Feb1994 7.69 5,274 12~1978 16.74 20,800 SOldier River at Pisgah, IA 407 1940 28.0 30Aug1993 18.69 11,337 12Jun1950 28.17 22,500 Boyer River at Logan, !A 871 1918 19.0 240e<:1993 27.86 48,317 17Jun1990 22.54 30,800 Missouri River at cmaha, NE 322,800 1928 29.0 31f.ug1993 22.77 70,438 181\pr1952 40.20 396,000 Missouri River at Nebraska City, NE 410,000 1929 28.0 07Hor1994 17.71 90,665 19Apr1952 27.66 414,000 west Nishnabotna R at Hancock, lA 609 1959 14.0 230e<:1993 28.02 36,348 021\pr19'13 24.76 29,257 Previous hi 22.1'/26400 9-13-72 west Nishnabotna R at Randolph, lA 1,326 1946 19.0 23Jun1994 18.35 8,936 26Hay1987 24.50 40,800 Max gh • 24.6' 05Har1949 ice East Nishnabotna R at Atlantic, lA 436 1960 17.0 30Aug1993 16.98 12.991 12Sep1972 22.81 26.700 East Nishnabotna R at Red oak, lA 894 1916 • 18.0 23Jun1994 15.70 9,625 13Sep1972 27.43 38,000 Max gh • 28.23' 13Jun1947 Nishnabotna River at Hillrburg, !A 2,806 1922 • 36.0 01Sep19'13 25.92 14,472 24Jun1947 26.03 55,500 Max gh • 28.27' 10Sep1989 Missouri River at Rulo, NE 414,900 1949 17.0 01Sep1993 18.67 93,861 22Apr1952 25.60 356,000 Max gh of 1994 backwater affected TABLE 2 1994 ~TER YEAR PEAK STAGES AND DISCHARGES

Maxi nun Max I 1994 nUn """"" Flood Conmeots DRAINAGE FLOOD AREA RECORD STAGE STAGE DISCHARGE STAGE DISCHARGE STREAM STATION (Sq Mil SINCE (Ftl DATE (Ft) (cfsl DATE (Ft) lcfsl PLATTE RIVER BASIN

North Platte River nr Sinclair, \oiY 4,175 1939 19.D 26Jun1994 8.98 11,3D9 11Jun1986 11.3D 16,20D North Platte River at Glenrock, IIY 13,538 1959 4.5 14Dct1993 4.25 7,336 14May1965 7.10 16,000 North Platte River below htlalen Res., IIY 16,425 1909 4.5 D5Aug1993 4.D3 1,980 26Jun1955 9.85 22,000 laranie River nr Ft. Laramie, \oiY 4,564 1915 n/a 21Aug1993 1.68 4,476 10May1973 9.40 6,260 North Platte River at WY-NE State line 22,218 1929 4.5 20Aug1993 5.60 4,219 02Jun1929 nr 17,900

North Platte River at Bridgeport, NE 25,300 1905 8.0 15Jul1994 8.34 3,220 26Jun1899 5.39 24,900 Site and datum then in use North Platte River at L-llon, NE 28,600 1937 1.0 17Jul1994 6.27 1,340 04Jun1971 nr 13,500 North Platte River at North Platte, NE 30,900 1895 1.0 08Jul1994 4.91 2,120 11Jun1909 nr 29,600 South Platte River at Hartsel, CO 880 1933 n/a 26May1994 2.30 359 27Apr1970 1.60 3,970 South Platte River at Waterton, CO 2,621 1928 6.0 26May1994 2.47 952 23Apr1942 5.68 5,700

N Fk South Platte R at Grant, 00 127 1908 • n/a 01Aug1993 1.88 594 07Jun1912 nr 990 Bear Creek at Sheridan, CO 260 1914 • 8.0 21Jun1994 3.65 226 07May1969 10.50 8,150 Bear creek at ltlrri son, co 164 1887 • 7.5 10May1994 4.82 121 24Jul1896 nr 8,600 South Platte River at Denver, CO 3,861 1889 • 9.0 25Apr1994 6.20 2,712 17Jun1965 18.66 40,300 Clear Creek at Golden, co 400 1974 1.0 30-1993 4.24 780 10Jul1983 6.44 2,370

.... Clear Cr~lc. at Derby, co 0 575 1916 8.0 20Jun1994 3.87 2,082 24Jul1965 8.97 5,070 South Platte River at Henderson, 00 4,713 1926 11.0 18Dct1993 6.66 3,727 06May1913 11.67 33,000 Max gh = 12.93' 17Jun1965 South Platte River nr Kersey, CO 9,598 1901 10.0 19Dct1993 5.48 2,478 08May1913 11.73 31,500 South Platte River at Julesburg, CO 23,193 1902 10.0 25Sep1993 5.24 1,600 Z0Jun1965 10.44 37,600 Canbined flow of channels South Platte River at North Platte, NE 24,300 1897 . 12.0 21Feb1994 6.59 507 03Jun1935 14.02 37,100

Platte River at Brady, NE 56,200 1935 5.0 04Jul1994 3.48 1,340 29JUI)1983 nr 23,500 Platte River at Kearney, NE 58,200 1982 6.0 25Feb1994 7.53 22,567 29Jun1983 7.42 23,700 Platte River nr Grand IS land, NE 58,800 1933 4.0 04Mar1994 3.96 6,980 06Jun1935 5.99 30,000 Max gh = 6.16' 27Mar196D ice Middle Loup River at St. Paul, NE 8,090 1894 • 8.0 20Feb1994 6.21 21,515 23Jun1947 nr 72,000 North loup River at St. Paul, NE 4,290 1894 • 5.5 04Mar1994 6.61 15,598 06Jun1896 nr 90,000

Elkhorn River at Norfolk, NE 2,790 1945 10.0 18Feb1994 8.03 6,736 14Jun1967 8.52 16,900 Elkhorn Rlver at west Point, NE 5,100 1940 12.0 04Mar1994 17.19 76,071 09Mar1993 19.30 90,658 Previous hi 13.2'/44000 6-15-67 Elkhorn River at waterloo, NE 6,900 1928 17.0 31Aug1993 10.95 16,046 12Jun1944 16.60 100,000 Site and datum then in use Platte River at North Bend, NE 77,100 1949 8.0 05Mar1994 9.59 16,190 29Mar1960 10.04 112,000 Platte River at Louisville, NE 85,800 1953 9.0 06Mar1994 8.17 72,749 24Jul1993 12.12 164,231 Previous hi 11.4'/144000 6-14-84

logan Creek at uehling, NE 1,030 1941 16.0 27Mar1994 29.81 37,560 20Feb1971 20.15 25,200 Salt Creek at Lincoln, NE 648 194'0 20.5 29Aug1993 11.56 6,351 19Jul1986 18.24 8,000 Salt Creek at Gr-. NE 1,051 1951 20.0 30Aug1993 17.75 16,783 13Jun1984 26.50 46,800 little Papillion Cr at Irvington. NE 32 1948 17.0 04Jul1994 15.16 2,822 03Jun1943 23.00 nr Big Papillion Creek at Fort Street, NE 126 1966 n/a 22Jun1994 18.86 6,545 17Feb1966 30.51 nr Papi ll ion Creek at Fort Crook, NE 384 1948 29.0 29Aug1993 31.13 11,645 21May1982 30.68 12,700 Max gh of 1993 backwater affected

• - not continuous record nr - not rated n/a - no flood stage available V. RESERVOIR ACCOMPLISHMENTS.

a. Flood Damages Prevented.

Flood damages prevented by Corps of Engineers and Bureau of Reclamation projects in FY94 and cumulative totals of flood damage prevented for each of the projects are summarized in Table 3.

b. Recreation Usage. Visitation hours for each project for FY91, FY92, FY93 and FY94 are tabulated in Table 4.

VI. RESERVOIR OPERATION. Actual operations for the past year and proposed operations through calendar year 1995 are discussed briefly in the following subsections. Individual project operation summaries are contained in Appendix 3. Table 5 summarizes the tributary reservoir flood control operation for 1994. 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 on Table 6.

a. Previous Years Operation (August 1, 1993 through July 31, 1994).

(1) Corps of Engineers Lakes. All Corps' tributary projects within the Omaha District were regulated in accordance with normal procedures during the period covered by this report. Bear Creek, Bowman-Haley, Cherry Creek, Papios #11, #16, #18, and #20, Pipestem, Salt Creeks #2, #4, #8, #9, #10, #12, #13, #14, #17, and #18, stored water in the flood storage zone or above their normal level at some time during the reporting period.

(a) Bear Creek Reservoir, Colorado. During the report period, the district renewed the two temporary one-year municipal and industrial water supply storage contracts for a total of 74 acre-feet under Section 6 of the Flood Control Act of 1944 (Public Law 534, 78th Congress), pending development of a long-term contract under the Water Supply Act of 1958, as amended. A revised memorandum of Understanding (MOU) between the Corps of Engineers and the State of Colorado was signed on June 20, 1988, superseding the previous MOU dated May 11, 1977. Under the revised MOU, the State Engineer or his representative will determine the storage and releases necessary to satisfy downstream water rights requirements when the pool level is below elevation 5559.0 ft. MSL. This target elevation encroaches one foot into the flood storage zone and was selected to allow flexibility in targeting authorized pool levels. During the report period, no requests were received to change to continuous gated regulation to store water per the contract.

11 TABLE 3 FLOOO twWlES PAEVENTED FY 11114 CORPS OF ENGINEERS, OMNIA DISTRICT PRO.JECTS LOCAL~ MAIN STEM REDUCT10NS (SOOO)

~ Tolol ~ Omoho Dlolrlct Prajoolo l.oc:olllon- Thru FY113 FEIIIIIIARY MARCH - MAY JUNE JULY FY 11114 Thru FYt4 so 33.0 0.0 33.0 Hooper NE 1,«J3.1 1,032.1 1,032.1 2,835.2 -Hoi Springo so 0.0 0.0 0.0 ldoO..W. lA ll!i5.1 11111.3 11111.3 11116.1 some 35,412.0 814.0 814.0 38,321.0- Lillie ...... NE 4,475.7 0.0 4,475.7 UllloSiouxRMr lA 181.1181.4 1.221.3 128.8 1,855.5 3,310.8 184,880.0 --I odgopnlo Clc. 0 Siclnof NE 0.0 .... 0.0 0.0 NE 4.388.8 202.0 202.0 4,511.8 NO 21,104.0 11,125.1 11,825.1 32,728.1 - NO 1,448.0 0.0 1,448.0 -MoodowGnwo NE 41.0 0.0 41.0 NE 8,437.0 0.0 8,437.0 --Omoho 425,871.8 0.0 1,784.3 NE 0.0 0.0 0.0 0.0 1,784.3 427,m.2 -PebbloCI! .• - NE 12.200.1 0.0 12,200.1 Pleroo NE 801.5 37.2 37.2 843.7 1-' NE 1,531.0 5211.11 528.11 2,011.11 1\J - R. 0 Schuylor Rod !We Gulch so 250.0 0.0 250.0 RodOolc lA 8.511.0 4311.1 431.1 10,000.1 Saoo MT 817.1 0.0 817.1 Schuylor. L.aol Clc. NE »1.0 0.0 »1.0 NO 0.0 0.0 0.0 WY 741.0 0.0 741.0 -s-R. Cll'do Pork MT 158.0 0.0 158.0 -Sioux F... so 17,422.11 45.2 1.1 40.1 11.4 17,508.3 Vaughn MT -.0 0.0 -.0 w- NE 410.0 0.0 410.0 Wool- MT 317.0 1,741.2 1,741.2 2,138.2 Wool- NE 10,872.7 5,482.1 5,482.1 18,454.1

S-: 1.310,841.4 1,107.8 23,411.5 0.0 1.1 8,147.1 811.1 35,113.2 1,408,112.8

Olhor Prajoolo so 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 o.o- -~

Tolol Cupo Prajoolo: MRO 3,154,11116.1 1,107.8 13,434.3 0.0 1.1 25,781.7 811.1 111,827.1 3,218,482.1 lncl-- RIMF '--L-«!7 and L-«!4. - - .. -.,...... -. Pn>jocl------$422,000 ..... " ... --llllho-111$11,000 IIIIIUI!IIy. TABLE.. , 3 FLOOD DAMAGES PREVENTED FY 1994 CORPS OF ENGINEERS,~ DISTRICT PROJECTS LOCAL AND I.WN STEM REDUCTIDNS (SOOO)

Cumulollvo Talol CurnuloiM Omeha Dlolrtct Prujoolo l.ocollon- Thru FYII3 FEBRUARY IWIQt APRL W.Y JUNE JULY FY 1994 ThN FYI4 MRO 1,171,112.3 0.0 45,382.4 0.0 0.0 1,181.7 0.0 54,074.0 1,230,118.3

Prujoolo ---Other-Auronl Dam/D.S. Chonl.lmpr. co 7,413.2 0.0 7,413.2 -Cteoi

s.-: 290,901.0 0.0 1,233.5 0.0 0.0 2,347.1 0.0 3,580.1 214,411.1

Mooouri R'-~ Syotem L-«11 lA 71,110.3 0.0 4,454.2 0.0 0.0 1,171.1 0.0 1,332.1 85,213.1 L.- lA 51,058.0 0.0 3,148.7 0.0 0.0 1,321.4 0.0 4,471.1 10,537.1 L-575 1M«> 71,864.1 0.0 2,011.1 0.0 0.0 540.7 0.0 2,5511.3 74,523.11 ,_. L-511/L-550 MO 51,114.1 0.0 1,724.7 0.0 0.0 412.0 0.0 2,118.7 51,350.1 w L-539 MO 11,315.1 0.0 472.1 0.0 0.0 121.5 0.0 5111.1 11,1113.7 R.e13 NE 17,118.1 0.0 871.4 0.0 0.0 412.1 0.0 1,3111.0 11,551.1 R-573 NE 3,023.4 0.0 18.7 0.0 0.0 23.2 0.0 108.11 3,133.3 R-512 NE 1,111.7 0.0 218.1 0.0 0.0 72.3 0.0 342.1 1,040.1 R-541 NE 1,542.5 0.0 117.11 0.0 0.0 150.3 0.0 231.2 1,710.7 R-520 NE 1,829.1 0.0 57.1 0.0 0.0 15.5 0.0 73.3 1,802.4

s.-: 318,882.4 0.0 13,388.1 0.0 0.0 4,11'10.1 0.0 11,310.0 335,002.4

LoooiPruledlon Pn1jocts -Foun:ho so 310.0 0.0 310.0 Big Sioux R. 0 Sioux Clly lA 102.1 0.0 102.1 NE 218.0 73.5 73.5 342.5 -rdCnlok . --. NE 101.0 0.0 108.0 Clorbon NE 170.11 38.8 38.8 707.1 Columbuo NE 15,328.5 110.0 110.0 15,508.5 --CounciBiulla lA 414,373.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 414,373.0. E...._, lA 0.0 0.0 0.0 Flojd- lA 27,441.0 0.0 27,441.0 Foroyth MT 1,148.1 0.0 1,148.1 Gering NE 520.0 585.4 585.4 1,115.4 G._ MT 1,321.0 0.0 1,321.0 Oreal F.. MT 0.0 0.0 0.0 G.... WY 5,818.2 0.0 5,818.2 Homburg lA 105.512.11 8,541.1 1,541.1 112,124.5 MT 24,030.7 1,033.1 1,033.1 25,083.1 --- lA 552.0 0.0 552.0 TABLE 3

FLOOD DAMAGES PREVENTED FY 1994 BUREAU OF RECLAMATION, OMAHA DISTRICT PROJECTS LOCAL AND MAIN STEM REDUCTIONS ($000)

Omoha Diotrlcl R-'1 Cumulll!ve Tahll c....- River- Projeds I.OC8IIon ThruFY93 FEBRUARY MARCH APRIL MAY JUNE JULY FY 1994 ThruFY94

Big Hom River Boyson WY <42,103.9 0.0 0.0 0.0 0.0 298.0 0.0 298.0 -42.«11.9 Butrolo 811 WY 3,204.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 3,204.5 Bull..lke WY 1,993.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1,993.9 y- MT 51,819.9 0.0 0.0 0.0 0.0 3o4.o4 0.0 3-4.4 51,854.3

SUbldll: 98,922.2 0.0 0.0 0.0 0.0 332.-4 0.0 332.4 99,25-4.6

~. Cheyenne River Arv-tura so 20.-4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 20.4 k" l

5,328.1 Nor1h - River Pathrluda WY 0.0 0.0 0.0 0.0 0.0 0.0 0.0 5,328.1 WY 228.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 228.2 WY 13,205.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 13,205.5 -~ WY 439.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 439.0 -~ WYINE 37,080.9 0.0 0.0 0.0 1,915.8 0.0 0.0 1,915.8 38,998.7 ~: 58,279.7 0.0 0.0 0.0 1,915.8 0.0 0.0 1,915.8 58,195.5

S.., River Glboon MT 2,927.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2,927.8

Threelorlal- Cllrk Canyon MT 7,397.1 0.0 0.0 0.0 0.0 0.1 0.0 0.1 7,397.2

Tahll lknou Projods: 347,191.3 0.0 12,075.0 9.3 1,815.8 1,181.1 0.0 15,181.2 382,372.5

• TABLE 4

RECREATION VISITATION IN HOURS FY91 FY92 FY93 FY94

Bowman- Haley 140,508 65,400 322,900 207,300 Cottonwood Springs 126,076 188,900 131,400 143,900 Coldbrook 404,810 474,200 98,100 114,800

Pipestem 300,780 317,200 288,400 302,000 Papillion Creek #11 1,889,447 1,662,800 732,500 534,000

Papillion Creek #16 576,437 628,300 308,200 234,900 Papillion Creek #18 575,100 645,500

Papillion Creek #20 1,182,110 1,073,100 534,500 520,800 Papillion Creek Total 3,647,994 3,364,200 2,150,300 1,935,200

Chatfield 4,207,100 4,267,100 4,944,600 5,676,400 Cherry Creek 6,910,800 6,682,400 11,462,200 7,741,300

Bear Creek 407,400 432,900 578,000 697,800

Salt Creek #2 104,969 81,600 88,200 61,600 Salt Creek #4 126,594 106,500 105,700 107,500

Salt Creek #8 178,987 106,300 99,700 83,100

Salt Creek #9 43,964 50,100 62,400 63,500 Salt Creek #10 137,533 103,700 38,600 36,700 Salt Creek #12 235,019 219,600 388,200 322,700

Salt Creek #13 80,882 75,800 22,700 20,900 Salt Creek #14 2,327,735 2,034,200 1,775,300 1,333,900 Salt Creek #17 4,499,183 3,880,100 1,623,800 1,584,500

Salt Creek #18 6,004,931 5,184,400 3,503,600 2,800,000

Salt Creek Total 13,739,797 11,842,300 7,708,200 6,414,400 TOTAL 29,656,865 27,886,600 27,864,100 23,233,100

15 TABLE 5

UTILIZATION OF EXCLUSIVE FLOOD STORAGE ZONE OMAHA DISTRICT TRIBUTARY PROJECT

Percent of Flood Control Storage Total of Tributary 25% or 50% or 75% or 100% or Year Projects More More More More 1967 26 3 2 2 0 1968 27 0 0 0 0 1969 27 1 0 0 0 1970 28 2 2 0 0 1971 28 2 1 0 0 1972 28 1 0 0 0 1973 28 6 2 1 0 1974 31 1 1 0 0 1975 32 6 2 1 1 1976 32 2 1 0 0 1977 32 0 0 0 0 1978 33 5 1 0 0 1979 33 1 0 0 0 1980 33 2 1 0 0 1981 33 2 1 1 0 1982 33 2 1 0 0 1983 34 5 1 1 0 1984 35 7 2 1 1 1985 35 0 0 0 0 1986 35 5 0 0 0 1987 35 3 0 0 0 1988 35 0 0 0 0

16 TABLE 5 (Continued)

1989 35 0 0 0 0 1990 36 0 0 0 0 1991 36 2 1 0 0 1992 36 0 0 0 0 1993 36 12 0 0 0 1994 36 2 0 0 0 TOTAL 72 19 7 2

100% or More Events: 1975 - Canyon Ferry Reservoir/1984 - Clark Canyon Reservoir/1994- Pipestem and Jamestown Reservoirs

In January 1992, the Denver Regional Council of Governments (DRCOG) requested the Corps of Engineers' participation in a demonstration project at Bear Creek Reservoir using hypolimnetic withdrawals throughout the year. The DRCOG has requested that the Corps of Engineers continue the release into 1995. The water quality in the reservoir and downstream of the reservoir would be monitored to assess the effectiveness of this management practice on water quality. The Corps of Engineers would make variable releases through the year depending on the inflow. The following table shows the approximate release targets as requested by DRCOG:

STREAMFLOW RELEASE

> 20 cfs 10 cfs 15 - 20 cfs 7 - 9 cis 10- 15 cfs 5 - 6 cfs

< 10 cfs 0 cfs

Release changes were made weekly as needed throughout the year. However, this year the District 9 Commissioner requested that approximately 3 cfs be released through the low-level outlet to maintain water in the channel if Bear Creek Reservoir were to drop below elevation 5558.0. While trying to maintain the 3 cis from the low level gate, the gate shaft broke. Subsequently, releases were made from the mid level gate until repairs can be made. b. Chatfield Reservoir, Colorado. During the report period, no release orders were made to evacuate water from the flood control zone. All the releases during the report period were made by the State Engineer. Gated releases made by the State Engineer varied from a maximum daily average of 655 cfs on May 11, 1994, to 0 cfs on September 14-26 and October 23 - November 4. A total of 19,745 acre-feet was delivered via the canals during the report period compared with 20,373 acre-feet during the last report period. The pool was in the flood control storage zone only slightly during March and April. Bottom of flood control pool is elevation 5432.0. The maximum pool elevation during this period was 5432.10 on April 11 , 1994.

c. Cherry Creek Reservoir, Colorado. On April 1, 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. Releases from the project were coordinated by the Water Control Section to comply with downstream river calls as determined by the Colorado State Engineers office. A total of 11 release orders were made during the report period. The releases were made to meet downstream water needs and for a sediment flushing exercise. Releases varied from 75 cfs to 8 cfs for water control and water rights and up to 320 cfs during the flushing exercise. Gate changes were made between August 1, 1993 and July 31, 1994. The sediment flushing releases were made May 18th & 19th, 1994 to remove sediments inside of the intake and conduit. This exercise will be completed annually.

d. Bowman-Haley, North Dakota. Due to the substantial snow cover, the low-level gate was opened on 17 February 1994, discharging 20 cfs. The melt began the first part of March, with water commencing to run over the morning glory intake on 6 March 1994. The pool remained in the flood zone until mid-May but the low-level was not shut until June. The pool was drawn down a foot below the top morning glory weir to facilitate a carp control effort. During the gate operation, the mid-level gate was damaged and beginning in July the pool was lowered to 2751.5 ft above MSL to allow gate repair.

e. Pipestem, North Dakota. The threat of spring snowmelt flooding over the James River basin in North Dakota was extremely high in 1994. Four of the factors that contribute to snowmelt flooding were present in March; high fall soil moisture, deep hard ground frost, heavy winter snow cover, and high base flows. The NWS was reporting snow water equivalents over the upper basin of 4-6 inches. The two unknown factors were how quickly the melt would occur and whether there would be rain during the melting period.

The threat was great enough for the Omaha District to hold a coordination meeting in Jamestown, North Dakota on March 9. In attendance were the City of Jamestown, NWS, Stutsman County Emergency Management, USSR, and

---· ------~ -~~~-~-----~-.,...... ,-- local media. The Water Control Section presented the results of their HEC-1 modeling effort, coupled with the NWS's ESP (Extended Streamflow Projection) program. The results indicated a strong likelihood of reaching the 750 cfs release level at Jamestown and some probability of reaching the level requiring 1800 cfs.

The snowmelt began in mid-March, a gradual warming with no rainfall. It resulted in an inch of runoff into the projects from a snowpack of an estimated 4-6 inches water equivalency.

Even though the large runoff that was expected did not materialize, it was enough to push the pool at Jamestown to the 1440.5 ft above MSL level. This was enough to require the 750 cfs release out of Jamestown. The city of Jamestown was given several days to place channel blocks in the oxbow area before increasing the release. No problems were reported from the release.

The operation of Jamestown and Pipestem Dams during the 1994 year is summarized in Plates 1 through 4.

f. Papillion Creek Basin, Nebraska. Minor low-level releases were made during November 1993 at all the Papillion Creek projects to lower pool levels to facilitate inspection of the outlet conduits.

g. Salt Creek Basin, Nebraska. Minor releases were made from the low-level gates, in November 1993 at all the Salt Creek projects to lower the pools to facilitate inspection of the outlet conduits.

(2) Bureau of Reclamation Dams. Reservoir operations at the 11 Bureau of Reclamation projects in the Omaha District were carried out in accordance with normal regulation procedures during the period covered by this report. Seven of the eleven Section 7 projects stored water in the flood control zone. Relatively minor encroachments occurred at Boysen, Heart Butte, Pactola and Shadehill Dams.

Jamestown Dam, North Dakota. As this project is operated in tandem with Pipestem Dam, refer to Section Vl.a.(1 )(d), Pipestem, North Dakota, for a discussion of the operation of Jamestown Dam.

(b) Proposed Operations.

(1) Corps of Engineers. 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 the low-level outlets for various purposes. Releases to meet downstream water rights can be expected at Bowman-Haley, Coldbrook, Chatfield, Cherry Creek, Bear Creek and Salt Creek #18. Evacuation of stored flood water in these projects is scheduled as soon as practicable after each flood event.

19 (a) North Dakota. Flood releases from Pipestem Dam will be coordinated with those from the Bureau's Jamestown Dam. The low-level gate at Pipestem will be opened when water is flowing over the drop inlet to assist in the improvement of lake water quality. 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 July 15th. If the local sponsor concurs and winter downstream conditions permit, water will be evacuated from the lower elevations each year starting in early February.

(b) South Dakota. Coldbrook Reservoir inflows up to 1.1 cis will be released to the Larive Lake Resort when requested to meet their water right.

20 PIPJ!:STBII DAM 350 -.------~~~~~~~------.-1465

P:IPBSTBM 300 .' - :'. ~ RBLBABB ' ' ', ' ' 1460 '

250 '-

B •'' L F '' L '' 1455 B 0 200 PIPBS'l"BII ,- ' v w POOL BLBVAT:IOH I N I N F c 150 T F 1450 II s s L

1 \I' 100 1! I 1 '' 1445

0 ~------r------,------,------r------,------,r------r------+-1440 MAR APR MAY JON JUL AUG SBP OCT 1994 PIPBSTBM DAM RBLBASB PIPBS'l"BII DAN POOL BLBVATION JAKBSTOWN DAK 800 -.------~~~~~~~------.-1442

700 1440

600 POOL BLliVATION ., / 1438 '' B p 500 L --- B L 0 1436 v w -- I 400 N I . '' N p ' --- .. c 1434 T "' p "' II s 300 ' s ' JAJIBS'1'01f'H L RBLBASB ·~\ • 1432 200 ' ' ' ' ' ' ' 1430 100 ' ------.,. ______'! I ' - - 0 _,--~~·~-.------r------r------r------r------r------,------r-1428' KAR APR KAY JUN JUL AUG SBP OCT 1994 JAMBSTOWN DAM RBLBASB JAJIBS'l'OWH DAM POOL BLBVATIOH RBLBASBS PROM JAKBBTOWN AND PIPBSTBM RBSBRVOIRS 800

700 COMBIHBD RBLBASB

600

F 500 L I 0 I --.._r-_ w I I 400 I N I "'w c /1___ 1 F I s 300 JJAMBSTOWH RBLBASB I I I , ,. - _, PIPBSTBN RBLBASB I •', 200 j- ~ r- "T""-·' ' I 1 ' I, I r ' I' ' ' I I I 1 I I 'I \.------· L-- 100 '-r-' t -- '----.-----.- '

0 liAR APR IIAY JUN JUL AUG SBP OCT 1994 JAKBSTOWN RBLBASB PIPBBTBK RBLBASB w COMBINBD RBLBASB 4000 --,------~J~A~K~B~S~R~X~V~B~R~P~L~O~W~~A~T~J~A~K~B~S~T~O~W~Y~,~Y~O~R~T~B~~D~A~B~O~T~A~------r- 80000

3500 70000 FLOOD CONTROL STORAGB

3000 / 60000 p c

p 2500 50000 s T L 0 0 w R 2000 40000 I I N "' N .. c A p c R s 1500 30000 B p T 1000 OBSBlt.VBD PLOW 20000

500 10000

0 MAR APR MAY JON JUL AUG SBP OCT 1994· BSTIMATBD UNRBGULATBD PLOW AT JAMBSTOWN GAGB (11'ITBOUT DAMS} ACTUAL OBSBRVBD PLOW AT QAQB {WITH RBOULATION OF DAMS} .. COMBINBD STORAGB IN FLOOD CONTROL ZONBS AT JAKBSTOWN AND PIPBSTBK DANS (c) Colorado. At Chatfield Reservoir, the pool level is expected to fluctuate between elevations 5423.0 and 5432.0 ft above MSL at all times except during prolonged periods of drought or excessive runoff. Each year, from May 1 to August 31, the pool level is not expected to fall below elevation 5426.85 ft above MSL (20,000 acre-feet) for recreational purposes. Storage of water above elevation 5426.85 to elevation 5432.0 ft above MSL will depend on the availability of free water and/or excessive runoff and/or the desire of the City of Denver to store water. During the Colorado irrigation season, inflows to Cherry Creek Reservoir will be calculated by the Water control Section and the State Engineer 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. The flushing schedule utilizes approximately 150 to 250 acre-feet of water. At Bear Creek Reservoir, the low-level gate will be opened when practical during the June through August period when the lake typically stratifies to assist in the improvement of lake water quality if requested.

(d) Nebraska. At Salt Creek Dam #18, releases of inflow up to a total of 11.57 cfs may be made. 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.

(2) 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. Pertinent special operating plans are described as follows: 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.

(a) 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 above MSL by the following March 1. In addition, the Montana Power Company will try to limit releases from .Hebgen Reservoir to maintain Canyon Ferry pool below elevation 3794.0 ft above MSL after December 1. Storage below elevation 3794.0 ft above 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 above MSL near the end of June.

25 (b) Tiber. In accordance with the Water Control Agreement, the joint-use zone at Tiber Reservoir will be vacated to elevation 2976.0 ft above MSL by March 1. March-June releases are based on forecasted inflows with the objective of filling Lake Elwell to elevation 2993.0 ft above MSL by the end of June. However, if necessary, March-June releases may be based on filling the reservoir to as high as elevation 3008.0 ft above MSL by the end of June to provide replacement storage and assist the Corps in the operation of the mainstem reservoir system.

(c) Yellowtail. Yellowtail Reservoir will be regulated to be no higher than elevation 3630.0 ft above MSL by November 30 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 above 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 above MSL by the end of July.

(d) 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 July 4, 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.

VII. MAJOR REGULATION PROBLEMS. Regulation problems experienced during the period of this report are discussed briefly in the following paragraphs.

a. Water Quality. Water quality problems, including algal blooms and low dissolved oxygen, exist at certain tributary reservoirs. The principal water quality issues and problems at each of the projects during 1994 are covered in a separate report prepared by the Water Quality Unit.

b. Downstream Channel Capacity. Inadequate or reduced channel capacity is a problem below many of the tributary reservoirs. Encroachment by natural plant growth due to low flows, by flood deposits left in place, and by human construction and agriculture practices, are common. In some cases, downstream channel capacity is significantly less than flood control releases. For example, the channel downstream of Coldbrook Dam is undefinable 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

26 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. These issues will be addressed in a Tri-Lakes Master Water Control Manual.

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 over the 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 over 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 store and/or 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 two Corps of Engineers and eleven Bureau of Reclamation tributary reservoirs cannot safely pass the PMF without being overtopped. Following is inform at ion on each of these projects along with the status of potential corrective actions: (1) Corps of Engineers Dams

(a) Cherry Creek Dam. The reconnaissance report for the Cherry Creek Dam hydrologic improvement assessment was approved by HQUSACE on 15 April 1994. The report concluded that the reservoir could safely pass no more than 63 percent of the probable maximum flood under existing development with adequate freeboard, and a dam crest raise of 19 feet was recommended. The report was approved as a basis to prepare a dam safety evaluation report in accordance with draft ER 1110-2-1155 dated March 1994. The District was further instructed to program FY -96 O&M funds for this effort. As of the date of this report, the effort was not funded in the FY-96 O&M budget.

(b) Cold brook Dam. On 11 August 1993, the revised draft reconnaissance report for the Coldbrook Dam hydrologic improvement assessment was furnished on Missouri River Division (MRD) for review. The report concluded that the Coldbrook project was hydraulically deficient as it could safely pass only 48 percent of the PMF with adequate freeboard. MRD has recommended to HQUSACE removing the Coldbrook Dam from the dam safety, long-term investment program due to the uncertainty in calculating the potential loss of life (LOL) for existing and dam fix conditions. The reconnaissance report is currently being reviewed by HQUSACE and a decision has not yet been reached.

27 (2) Bureau of Reclamation Dams.

(a) Clark Canyon Dam. The PMF for Clark Canyon Dam is characterized by a peak inflow of 166,800 cis and a volume of 506,000 acre-feet. Clark Canyon Dam will be overtopped by floods exceeding 58 percent of the PMF. The Bureau of Reclamation's recommended corrective action is the implementation of an Early Warning System (EWS). Work has been initiated on the EWS.

(b) Canyon Ferry Dam. The PMF for Canyon Ferry Dam is characterized by a peak inflow of 506,000 cis and a 15-day volume of 2,035,000 acre feet. Canyon Ferry Dam will be overtopped by floods exceeding 94 percent of the PMF. The potential for dam failure during overtopping is considered to be low. Corrective actions are not anticipated.

(c) Tiber Dam. The PMF for the Tiber Dam is characterized by a peak inflow of 695,926 cis and a 15-day volume of 1,443,000 acre-feet. Tiber Dam will be overtopped by floods exceeding 59 percent of the PMF. An EWS is anticipated as the recommended corrective action.

(d) Boysen Dam. The PMF for Boysen Dam is characterized by a peak inflow of 845,000 cis and a 15-day volume of 2,820,000 acre-feet. Boysen Dam will be overtopped by floods exceeding 48 percent of the PMF. The Bureau of Reclamation's recommended corrective action is the implementation of an EWS in conjunction with the EWSs at upstream dams (Pilot Butte and Bull Lake Dams). Work has been initiated on the EWS.

(e) Yellowtail Dam. The PMF for Yellowtail Dam is characterized by a peak inflow of 887,000 cis and a volume of 4,700,000 acre-feet. Yellowtail Dam will be overtopped by floods exceeding 31 percent of the PMF. The potential for dam failure during overtopping is considered to be low. Corrective actions are not anticipated.

(f) Heart Butte Dam. The PMF for Heart Butte Dam is characterized by a peak inflow of 161 ,400 cis and a volume of 558,600 acre-feet. Heart Butte Dam was modified in 1987 to safely pass the PMF.

(g) Jamestown Dam. The PMF for Jamestown Dam is characterized by a peak inflow of 110,200 cis and a volume of 589,500 acre-feet. Jamestown Dam will be overtopped by floods exceeding 91 percent of the PMF. Piping failure of Jamestown Dam during high reservoir conditions is also a dam safety concern. Corrective actions will likely include the implementation of an EWS and installation of toe drains or relief wells.

(h) Keyhole Dam. The PMF for Keyhole Dam is characterized by a peak inflow of 513,600 cis and a volume of 785,800 acre-feet. Keyhole Dam will be overtopped by floods exceeding 75 percent of the PMF. The Bureau of Reclamation's recommended corrective action is the implementation of an EWS.

28 (I) Pactola Dam. The PMF for Pactola Dam is characterized by a peak inflow of 321,240 cfs and a volume of 159,800 acre-feet. The PMF for Pactola Dam has not been updated since 1981. Pactola Dam was modified in 1985-1987 to safely pass the current PMF.

(j) Shadehill Dam. The PMF for Shadehill Dam is characterized by a peak inflow of 423,200 cfs and a volume of 1,324,900 acre-feet. Shadehill Dam will be overtopped by floods exceeding 77 percent of the PMF. The likely corrective action will be the implementation of an EWS.

(k) Glendo Dam. The PMF for Glendo Dam is characterized by a peak inflow of 627,100 cfs and a volume of 2, 197,000 acre-feet. Glendo Dam will be overtopped by floods exceeding 40 percent of the PMF. The Bureau of Reclamation has completed an extensive analysis of potential corrective actions for all of it's mainstem North Platte River Dams. These studies have resulted in the recommendation to modify Glendo Dam to pass 80 percent of the PMF (modification of Pathfinder Dam and Seminoe Dam is also recommended). The recommendation for modifications is based upon an analysis of the consequences of dam failure. The Bureau of Reclamation's studies indicate that failure of any of the larger mainstem dams (Seminoe Dam, Pathfinder Dam or Glendo Dam) will cause the subsequent failure of all downstream dams, including Kingsley Dam in central Nebraska.

VIII. WATER CONTROL MANUALS. Work progressed on several Water Control Manual updates during the year. The Westerly Creek Water Control Manual has been completed and sent to Missouri River Division for final approval. The Papillion Creek Water Control Manual has been approved by Missouri River Division pending closure of a water quality issue. The final draft of the Canyon Ferry Water Control Manual has been reviewed by Missouri River Division and will be ready for final approval by January 1995. The first draft of the Glendo Water Control Manual has been prepared and is being reviewed by the Bureau of Reclamation Wyoming Area Office in Casper, Wyoming. The final draft of the Lake Audubon Water Control Manual has been sent to Missouri River Division for final approval.

Funding has been received for Phase I of the Tri-Lakes Master Manual (Chatfield, Cherry Creek, and Bear Creek). Phase I work will include developing and updating hydrologic models necessary for evaluating release options, updating stage damage relationships in downstream areas, and initiating environmental assessments. The Chatfield, Cherry Creek, and Bear Creek Water Control Manuals will also be updated during the preparation of the Tri-Lakes Master Manual.

Water Control Manuals will be updated on an approximate 10-year cycle, or more frequently, if required. When possible, updates at Corps of Engineers projects will occur immediately after updates of hydrographic surveys and area-capacity tables. Hydrographic surveys are completed on an approximate 1O·year cycle. The schedule of hydrographic surveys is contained in the report, "Program Report, FY 1994, Omaha District Sedimentation Program, March, 1994". If funds are not available for a

29 comprehensive review and update of a water control manual, at a minimum "baseline" O&M funds will be used to update area-capacity curves, rating curves, stage-damage curves, historical records, and documentation of large runoff events.

Table 6 indicates work priorities while Table 7 lists the current status of all Water Control Manuals.

IX. DATA COLLECTION PROGRAM AND PROCEDURES.

a. Collection of Water Control Data. Data from hydrologic gages for water control management is obtained from various sources including contract observers, project offices, National Weather Service, Geological Survey, Bureau of Reclamation and satellite Data Collection Platforms (DCPs). The National Weather Service (NWS) provides current weather conditions, 3-day forecasts and precipitation and snowfall reports along with current river levels, river level forecasts, and flood forecasts. Since March 1986, this service, called "Hydromet", has been retrieved from a NWS computer in Kansas City.

The Section uses an Alden Weather system. Radar images from nineteen (19) sites in eight states surrounding the Missouri River basin are available with this system. In addition, the NWS automatically sends satellite images via a direct telephone line to the system.

Since early 1992, the Omaha District, Water Control Section has been developing an HECDSS database for storing river and reservoir data. Data is input into the database from two sources. The program SHEFDSS is used to read data from the District's Direct Readout Ground Station. A commercial software package reads data retrieved from the Section's Domsat Read Only Terminal (DROT) system. The combined data set is then screened using HEC's recently released DATCHK and DATVUE programs.

The DROT was installed in the Fall of 1992. An 8-foot diameter satellite dish was installed on the roof of the Zorinsky Federal Building. The dish receives all DCP transmissions in the continental United States. A cable runs directly from the satellite dish to the two data capture workstations in the Water Control Office.

b. Automated Remote Sensors. State-of-the-art, remote site, satellite data transmissions are utilized for water control management. Satellite collection equipment being used by the District was purchased form Sutron Corporation. The equipment was and is installed and maintained by Section personnel and/or by contract. Currently, there are 21 DCPs in Montana, 4 in Wyoming, 21 in Colorado, 13 in North Dakota, 22 in South Dakota, 42 in Nebraska and 19 in Iowa for a total of 142 sites.

30 The DCPs in the District transmit real-time river and reservoir levels, precipitation, evaporation, wind, water and air temperature data. The hourly data collected by these remote sensors in 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.

31 TABLE 6

WORK PRIORITIES

Update Water Control Manuals Priority Project Remarks 1 Tri-Lakes Scheduled start FY-95 2 Papio Scheduled completion FY-95 3 Westerly Creek/Kelly Road Scheduled completion FY-95 4 Lake Audubon Scheduled completion FY-95

5 Canyon Ferry Scheduled completion FY-95 6 Glendo Started in FY -94 7 Chatfield Scheduled start FY-95 8 Bear Creek Scheduled start FY-95 9 Cherry Creek Scheduled start FY-95 10 Pipestem/Jamestown Scheduled start FY-95 11 Pactola To reflect raise in dam and widening of spillway 12 Col db rook To reflect changed outlet pipe and line from stilling basin 13 Shadehill To reflect changed outlet works REAL-TIME MODELS 1 Cherry Creek HEC-1F Model 2 Chatfield HEC-1F Model 3 Bear Creek HEC-1F Model 4 Canyon Ferry SSARR Model 5 Boysen SSARR Model 6 Yellowtail SSARR Model

32 TABLE 7

STATUS OF WATER CONTROL MANUALS OMAHA DISTRICT Scheduled Reservoir Stream Owner Approved Completion Audubon Snake Creek CE N/A FY-95 Bear Creek Bear Creek CE Jan 78 (P) FY-97 Boysen Big Hom River BR Dec 66 (F) Bowman-Haley N. Fk. Grand River CE Mar 87 (F) Bull Hook/ Bull Hook Cr/ CE Mar 91 (F) Scott Coulee Scott Coulee Canyon Ferry Missouri River BR Mar 72 (P) FY-95 Cedar Canyon Deadman's Gulch CE Jan 71 (F) Chatfield S. Platte River CE Jan 73 (P) FY-97 . Cherry Creek Cherry Creek CE Oct 71 (F) FY-97 Clark Canyon Beaver Head River BR Aug 76 (F) Coldbrook Coldbrook River CE Aug 54 (F) FY-97 Cottonwood Sp Cottonwood Sp Cr CE Sep 73 (F) Glendo N. Platte River BR Apr 70 (P) FY-96 Heart Butte Heart River CE Feb 51 (F) Jamestown James River BR Nov 57 (F) FY-97 Kelly Road Westerly Creek CE Jan 71 (F) FY-95

Keyhole Belle Fourche River CE Jun 69 (F) Papillion (4) Papillion Creekltribs CE Jan 79 (P) FY-95 Pactola Rapid Creek BR Feb 77 (F) FY-97 Pipestem Pipestem Creek CE Aug 86 (F) FY-97 Pocasse Spring Creek CE Apr 90 (F) Salt Creek (1 0) Salt Creekltribs CE Dec 78 (F) Shadehill Grand River CE Nov 51 (F) FY-97

33 TABLE 7 (Continued)

Tiber Marias River BR Oct 87 (F) Yellowtail Big Horn River BR Jan 74 (F) Tri-Lakes Bear Cr, Cherry Cr, CE N/A FY-97 S. Platte River Notes: P - Preliminary Manual F - Final Manual

The Missouri River gaging station at Brownville, Nebraska was relocated to a higher bank elevation because during the flood of 1993, the gage house was inundated with flood waters.

c. Cooperative Hydrologic Programs. Funding for the Omaha District's stream gaging activities is furnished through two programs. The Cooperative Stream Gaging (FC-33) program provides support to seven Geological Survey Districts. The 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 ground water 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 (FC-50) program provides financial support for the collection of data from 40 gaging stations within six river district offices. Formerly operated by the Corps of Engineers, these stations are required for reservoir regulation. The stations are in addition to the regular National Weather Service reporting stations.

d. Water Quality. The Omaha District Water Quality Unit conducts sampling analysis of physical, chemical and biological parameters on reservoirs in the Omaha District. Projects are normally sampled six times per year by in-house personnel or under contract. Occasional surveys and special investigations on all projects are conducted as necessary to identify or resolve specific water quality problems.

In-house personnel sample the Papillion Creek and Salt Creek Reservoirs. Bowman-Haley, Coldbrook, Chatfield, Bear Creek, Cherry Creek, Lake Audubon, Lake Pocasse, Lake Yankton, Pipestem and the Missouri River mainstem reservoirs are sampled by area personnel or under contract. Periodic sampling at Cottonwood Springs Reservoir has ceased since this project currently impounds very little water.

Inflows and releases are sampled by area or in-house personnel at all tributary projects. Inflows and releases of mainstem projects are sampled by area personnel or under contract by the USGS.

34 •

Continual remote monitoring and data storage of dissolved oxygen, temperature, conductivity and pH are conducted downstream of Gavins Point, Garrison and Fort Peck Projects. Continual remote monitoring of dissolved oxygen and temperature and periodic monitoring of conductivity and pH is conducted at Big Bend, Fort Randall and Oahe Projects. The monitoring is conducted by area personnel.

e. Sediment. All suspended sediment samples collected in the Omaha District are obtained by the Geological Survey under the Cooperative Stream Gaging Agreement. Complete sedimentation surveys of small reservoir projects are made at approximately 10-year intervals. These include aggradation surveys to update water volume storage and sediment accumulation values, monitor headwater disposition and lake shoreline erosion; and degradation surveys to monitor downstream channel changes.

X. FLOODING.

a. Nebraska.

Precipitation for Nebraska for the month of August was 4.30 inches which was the second wettest August in over 62 years. A long band of 2 to 4 inch rains fell on the night of the 28th from Omaha southwest into Clay Center in south central Nebraska. A 6 inch pocket of heavy rains falling at Harvard caused the local School Creek out of banks and onto Highway 6 and also force sandbagging at Sutton as a preventative measure. Five inch rains in Papillion brought on some street flooding that same night.

On the next night of the 29th, widespread heavy rains fell in the northeast areas of the state. Three to 7 inches of rain in Boone County caused local washouts, flooded the upper part of Shell and Beaver Creeks and flooded state highways near Albion, Newman Grove and St. Edward. Another pocket of 4 to 7 inch rains in Wayne county brought the upper Logan Creek out of banks onto state highways near Laurel and Belden. On the 30th and 31st, the Missouri River came out of banks onto lowlands from Brownville to Rulo as a result of runoff from western Iowa streams and the Platte River in Nebraska.

The summer rainfall statewide totalled around 18 inches or 9 inches above normal. This was the wettest summer in over 62 years.

Flooding on the 1st and 2nd of September brought the Missouri River at Brownville 3 feet over flood stage and Rulo 1.5 feet over flood level. Heavy runoff from southwest Iowa and eastern Nebraska on Aug 29-30 was the cause of these localized overflows.

35 I

From the 13th through the 19th of February, a very mild week of sunny weather averaging some 15 degrees above normals melted nearly all the snow on the ground statewide. The runoff was strongest in the heavier packed northeast areas bringing moderate runoff along the middle reaches of the Elkhorn River where a strong ice jam formed in stretches from below Norfolk to near Crowell from the 18th to month's end. The state highway and citY park and streets at Wisner flooded off and on for a week. Downstream at West Point to Crowell, a larger ice jam flooded moderate areas of lowlands, State Highways 275 and 32 continuously until the end of the month. Also, on the Platte River on the 19th a small waterfront area near highway 6 flooded briefly from ice action. Other streams sustaining brief ice jams and flooding were the Niobrara, Bazile and Bow Creeks in the areas of the northeast flowing directly into the Missouri River.

Above Flood Stages Crest Flood (Dates) River and Station Stage (Feet) From To Stage Date (Feet)

North Fork Elkhorn River Hadar 12 N/A NIA 11.3 19th

North Loup River 19th St. Paul 3N 5.5 N/A NIA 5.8 ice affected

Loup River 19th Genoa 9 N/A NIA 9.3 ice affected

Elkhorn River 2oth West Point 12 Feb 19 Feb 28 15.3 ice jam

North Loup River 4th St Paul 5.5 Mar 1 Mar5 6.8 ice affected

Loup River 4th Genoa 9 4 5 9.4 ice affected

Platte River North Bend 8 5 5 8.3 5th Ashland 20 19.6 5th ice affected

Elkhorn River 5th West Point 12 1 5 17.1 ice affected

Missouri River Brownville 32 6 6 32.6 6th

The snowmelt runoff which began in late February finally ended in the first week of March with only localized overflows, mainly along the Elkhorn River from Wisner to Winslow. The city park and a few homes flooded in Wisner, otherwise the flooding was confined mostly to rural lowlands. Very minor overflows also occurred along the Loup, lower Platte and Missouri Rivers early in the month.

36 A very localized 1 to 5 inch flash flood falling several miles northwest of Sidney in the southern panhandle on the evening of May 18 caused minor rural flooding to pasturelands along the Lodgepole Creek. The local "Flood Alarm System" was triggered but no damages occurred.

On the evening of May 22 some 3 to 6 inch flash flood rains fell between 5 and 7 pm in southwest Nebraska some 10 to 20 miles west northwest of Imperial. Considerable damage to crops by the rains and hail took place along the upper Frenchman and Sand Creeks.

On the night of June 17-18 widespread heavy rains of 1 to 3 inches fell in northeast Nebraska. A small pocket of 6 to 9 inches fell in the headwaters of the North Fork Elkhorn River causing urban flooding to Osmond and many state highways downstream to Hadar. Some 10 to 15 homes suffered yard and basement flooding and the city park also had damages in south Osmond along the North Fork. The local paper reported this flood as the worst since February 1971.

On the night of June 23-24 widespread heavy rains of 1 to 3 inches fell in east central Nebraska. West soil conditions from earlier storms caused strong runoff along many streams and rivers. Minor storms caused strong runoff along many streams and rivers. Minor lowland flooding resulted along the Missouri River from Nebraska City to Rulo. More moderate flooding occurred along the Wahoo Creek affecting State Highway 77 at Wahoo and a county road to Ithaca. The most serious urban flooding happened in Omaha along Cole Creek when 4 to 5 inches fell in a short period that night allowing the creek to flood a few basements, streets, and "totaled-out" 300 new and used cars stored at a car dealership near 72nd Street.

On the night of July 1-2 general heavy rains of 1 to 2 inches fell in the eastern third of the state. Minor lowland flooding occurred in the Blue River basin between Lincoln and Beatrice as some 2 to 4 inches fell in that area.

On July 6 minor rural flooding took place along the Maple Creek at Nickerson. The Wahoo Creek flooded along State Highway 92 from Sand Creek on the east approach to Wahoo and also downstream near Ithaca. Five straight days of rains caused these overflows.

On July 12-13 two days of general 1 to 3 inch rains brought flooding to small streams, county roads and some street flooding to small towns in northeast Nebraska. The North Fork Elkhorn River came 1 to 2 feet out of banks from Pierce to Hadar, and the Maple Creek had some minor flooding, too.

b. Iowa.

Early in the morning of August 29th, 3 to 5 inches of rain fell in a narrow band from the Des Moines metro area and westward along and south of Interstate 80. The result was moderate to major flash flooding in Des Moines, West Des Moines and Clive along Walnut and Four Miles Creeks. Moderate flooding occurred in upper

37 portions of the Nishnabotna basin and lower portions of the Raccoon basin. On the 29th/30th, 1.5 to 3 inches of rain fell over the Little Sioux River basin; 1 to 2 inches fell over the Nishnabotna River basin. Thus, many rivers were rising again as September began.

Above Flood Stages Crest Flood (Dates) River and Station Stage (Feet) From To Stage Date (Feet)

MISSOURI RIVER BASIN

Little Sioux River 10 Aug (5·30) Aug 8-11 (12.4) (7·28) at Spencer 8·13 8-25 11.0 8·14(pm) 12.8 8-18 (pm) 8·29 (Sept) 11.5 8-31 (midday)

Little Sioux River 12 (5·31) 8·6 (18.34) (7-18) at Linn Grove Additional crests in July 8·15 8·25 15.58 8-19 1600 8-30 (Sept) (rising) (Sept)

Little Sioux River 17 e8-20 e8·21 e17 98·20 at Cherokee

E. Nishnabotna River nr Atlantic 17 8·30 8·30 17.34 8·30 1500 nr Red Oak 18 8·29 8-31 21.87 8·31 0230

W. Nishnabotna River 19 8·30 8·31 21.09 8·30 1645 at Randolph

Nishnabotna River above Hamburg 16 (6·24) 8·18 19.10 8·7 0300 21.64 8·12 2310 18.37 8-17 1900 8-19 8-21 17.77 8-191200 8·23 8·24 16.35 8-23 2000 8-29 (Sept) (rising) (Sept)

Little Sioux River 10 (8-29) 9-3 (11.5) (8·31) at Spencer

Little Sioux River 12 (8·29) 9·6 15.45 9·1 1100 at Linn Grove

Nishnabotna River 16 (8·29) 9-10 25.91 9·1 1100 above Hamburg 9-22 9·29 20.52 9·22 0800 20.05 9-23 1400 18.92 9·26 2100

38 Above Rood Stages Crest Flood (Dates) River and Station Stage (Feet) From To Stage Date (Feet)

Little Sioux River at Linn Grove 12 2-20 2-22 12.85 2-21 1600 nr Turin 20 2-19 2-19 25.25 2-191100 (ice jam)

West Fori< D~ch at Hornick 20 2-19 2-20 21.38 2-19 1530

Floyd River at Alton 12 3-4 3-6 15.49 3-5 0100

West Branch Floyd River nr Struble 14 3-4 3-5 15.92 3-4 2015

Little Sioux River at Spencer 10 3-4 3-14 14.0 3-6 (am)

Little Sioux River at Linn Grove 12 3-5 3-12 17.29 3-8 1600

Little Sioux River 17 3-5 3-6 e17.2 3-6 (ice) at Cherokee 3-9 3-11 18.5 3-10 (am) (ice jam)

Nishnabotna River abv Hamburg 16 3-5 3-5 16.52 3-5 1045

Rock River 6 6-13 6-14 e 7.80 6-14 0100e at Rock Rapids 6-23 6-23 e 6.85 6-23 2000e

Rock River 16 6-13 6-15 18.38 6-14 0900 nr Rock Valley 6-24 6-24 e16.25 6-24 0900e (gage outage)

Floyd River 12 6-13 6-13 e12.65 6-13 0930e nr Sheldon 6-23 6-24 e12.25 6-23 2230e

Floyd River 12 6-13 6-15 e17.27 6-13 2100 at Alton (msg rdngs) 6-22 6-23 13.83 6-22 1700 6-23 6-25 15.50 6-24 0500

Little Sioux River 10 6-13 (Jul) e14.00 6-15 1200e at Spencer e14.70 6-25 1000e

Little Sioux River 12 6-15 (Jul) 15.68 6-17 2100 at Linn Grove 15.14 6-21 2000 17.48 6-26 2000

39 Above Aood Stages Crest Flood (Dates) River and Station Stage (Feet) From To Stage Date (Feet)

Little Sioux River at Cherokee 17 6-18 6-30 20.36 6-28 1000

Nishnabotna River 16 6-2 6-2 18.14 6-2 0900 abv Hamburg 6-11 6-12 16.06 6-12 0000 6-13 6-14 18.66 6-13 1600 6-23 6-25 25.27 6-23 2100

Little Sioux River at Spencer 10 6-13 7-4 e14.70 6-25 1000e

. Little Sioux River 12 6-15 7-4 17.48 6-26 2000 at Linn Grove 7-15 7-17 12.50 7-16 0500

Nishnabotna River abv Hamburg 16 7-4 7-5 16.49 7-4 2300

On October 14th-15th, over 1/4 of an inch of rain fell over all but the northeast third of the state. Widespread 3/4 to 11/3 inch rains fell over the Nishnabotna River basin, and the Nishnabotna River above Hamburg crested just above flood stage.

Most of the flooding occurred during the first week of March, due to snowmelt and ice jams. The flooding from snowmelt was minor. Some locations saw moderate flooding due to ice jams, including: Beaver Creek at New Hartford, the Little Sioux River at Spencer, and the Des Moines River at Estherville and Fort Dodge. Most stations were back below flood stage by the beginning of the second week.

The month of June commenced with isolated thunderstorms over far southwest part of Iowa, which yielded enough rainfall to produce brief minor flooding along lower portions of the Nishnabotna River. The first of two significant June precipitation events began over Iowa during the 12th and 13th, with most of the heavy rainfall distributed from northwest Iowa near Sioux Falls southeast into the Cedar Rapids and Quad Cities areas. Precipitation amounts of 1 to 2 inches from this event were common, with several reports of 3 to 4 inches in and around the Spirit Lake area of northwest Iowa (about 75 miles east of Sioux Falls). This produced scattered areas of minor flooding, particularly over the upper reaches of the Des Moines and Iowa river basins.

The second and most significant of the two events struck the same parts of the state days later, as well as parts of southwest Iowa. The progression of storms across these areas produced rainfall amounts of 2 to 4 inches, with locally higher amounts as well (the highest being 5.45 inches at Oakland in southwest Iowa, about

~------30 miles east of Omaha). Several river basins in Iowa experienced flooding as a result of this event, with river levels remaining above flood stage at several locations in the state at the close of the month. (See Table)

c. Colorado. August · July. No flooding was reported anywhere in the South Platte Basin during the report period. The table below lists the precipitation by month relative to normal.

d. South Dakota. For most of the report period the northern South Dakota portion of the James River was above flood stage. January and February were about the only months when stages dropped below flood stage. This wasn't enough time to allow the fields to drain and for the second year in a row farmers were unable to plant their fields. By the end of the report period, the James had finally fallen enough to allow interior drainage.

The James River was flooded entering the report period in August 1993. This was largely a result of the 900 cfs release out of Jamestown and Pipestem Reservoirs. On August 29th and 30th, 1-4 inches of rain fell over the flooded northern James River in South Dakota, aggravating the flood problem. Releases were finally shutdown mid-November. However, river stages didn't fall in South Dakota until mid December. This was late enough that water over bank froze while spread over 1/4 to 1/2 mile of mostly pasture and hay ground.

By the second week in March, the James River basin generally had 3.5 to 4.5 inches of water equivalent. Brief warm spells gradually melted the snowpack. However, near record temperatures on the 19th of March followed by 3 warm days resulted in the entire length of the James River experiencing stages 2-4 feet over flood stages.

Stages remained above flood stage until June largely a result of releases as high as 600 cfs out of Jamestown and Pipestem Dams. Stages on the James River slowly fell to below flood stage by the end of June.

e. North Dakota. Snowmelt and ice jam flooding occurred in March. Moderate to major flooding began in North Dakota in the northwest part of the state on the Yellowstone and Missouri Rivers. Snowmelt in Montana was rapid and caused ice jam flooding in the Williston area. Fifty homes were damaged or destroyed by flood waters. Approximately 10,000 acres of prime irrigated farmland was flooded in the Buford-Trenton River bottoms. State highways 58 and 200 were flooded and ice covered. Thirty-seven families were evacuated. Livestock and farm equipment had to be moved to safe areas.

41 During the second week in March, many of the tributaries to the Missouri River in western and central North Dakota started responding to warmer temperatures and produced rises in river levels. Minor ice jam flooding occurred on the Heart and Knife Rivers. Even through rapid rises occurred in many places, flood stage was not attained at any of the gaging sites. The Heart River, rose 7-8 feet. The Knife River had 7-10 foot rises and along Spring Creek rises were around 6.5 feet. The Little Missouri had a 10 foot rise.

Flooding in the James River basin of east central North Dakota was simultaneous with the Missouri tributaries. Forecasts for LaMoure on the James River began march 11, and continued until the end of the month. LaMou re crested at 14.18 feet. Localized flooding in this basin impacted roads and bridges with some basement flooding from local runoff and seepage due to the high water table. The majority of the flooding was downstream from Jamestown.

f. Montana. On August 21 and 22 torrential rains moved through northeastern Montana with over 8 inches of rain occurring in Wolf Point area. Extensive damage occurred to crops, property and roadways.

With the March ice break up, ice jam flooding occurred on the Missouri River at Fort Benton and downstream into Fort Peck Reservoir, the Marias River, the Musselshell River and Big Dry Creek. The NWS reported widespread flooding to towns and farmland.

Streamflows on the Milk River at Eastern Crossing of the International Boundary, Big Dry Creek near Van Norman, and Redwater River at Circle exceed the 25-year flood flows. A 25-year flood has a 4 percent chance of occurring in any given year.

Record high river stages were recorded by the U.S. Geological Survey, Water Resources Division, near Sidney on Sunday, March 6, 1994. Records have been kept on the Yellowstone River near Sidney since 1910. On the morning of March 6, the streamflow was 23.96 feet, 2.11 feet higher than the previous record of 21.85 feet, recorded on march 22, 1947.

Stages on the Powder River, Tongue River, and Rosebud Creek also approached or exceeded previous record highs.

g. Wyoming. No significant flood in the Omaha District boundaries was observed during the report period.

42 XI. WATER CONTROL INITIATIVES.

a. Missouri River Division Water Control Data System Master Plan. Development continues on HECDSS. Data from various sources are being translated and written to the HECDSS database.

b. The Omaha District created a GIS users group this year with close to 50 GIS users involved in discussions and decisions pertinent to the District GIS goals. Water control is becoming more involved with GIS and would like to develop geographic hydrologic, hydraulic and economic tools to help in our decision making and briefing of other elements to the District Commander.

XII. FERC Applications. During the period of this report, 2 applications for preliminary permits, licenses or exemption from licensing were made to the Federal Energy Regulatory commission by various entities for studies in connection with new or existing hydropower facilities within the Omaha District. These applications were reviewed and comments were prepared by the Omaha District on the impacts of the proposed plant.

XIII. TRAINING AND METHODS. During the period of this report, employees in the Section attended the courses listed below:

1. Risk Analysis (2) Omaha, NE 28 Hrs Oct 94

2. GIS Introduction Hanover, NH 36 Hrs May 94

3. CPR Refresher (5) Omaha, NE 4 Hrs Mar 94

4. Ice Workshop (2) Omaha, NE 16 Hrs Jan 94

5. Boat Operators Training (2) Yankton, SD 24 Hrs Sep 94

6. TOT for Managers Omaha, NE 36 Hrs Oct 93

7. TOM for Pro Act Teams (2) Omaha, NE 36 Hrs Feb 94

8. Process Action Team Trng Omaha, NE 40 Hrs May 94

9. LEAD Refresher Omaha, NE 12 Hrs Jun 94

10. Pre-Retirement Planning Omaha, NE 16 Hrs Nov 93

11. Electronic Forms Omaha, NE 8 Hrs Jan 94

43 12. Marks Refresher Omaha, NE 8 Hrs Feb 94

13. Windows (2) Omaha, NE 8 Hrs (varies)

14. Harvard Graphic Omaha, NE 6 Hrs Oct 93

15. Timekeeper Training Omaha, NE 8 Hrs Apr 94

XIV. PERSONNEL. The personnel strength of the Water Control Section currently consists of three Hydraulic Engineers, four Hydrologic Engineering Technicians, a part time Secretary; a total of 9 personnel.

44 • . i

MAP

FLOOD CONTROL

DAMS

APPENDIX 1 OMAHA DISTRICT BOUNDARY

Bridgeport N E B R A s Lake CHEYENNE @

SALT CREEK DAMS (C. E.) Chee5man Res. SCALE IN MILES 50 0 50 100 '---El•v•nmil• Canyon Res.

1-sp;''"''' M''" Res. LEGEND: (C.E.) CORPS OF ENGINEERS FEDERAL TRIBUTARY PROJECTS IB.R.) BUREAU OF RECLAMATION WITH FLOOD CONTROL STORAGE U.S. ARMY ENGINEER DISTRICT, OMAHA TRI-LAKES DAMS CORPS OF ENGINEERS OMAHA, NEBRASKA (C. E.) REVISED AUGUST 1988 PROJECT DATA SHEETS - TRIBUTARY

(5 SHEETS)

CORPS OF ENGINEERS DAMS

SALT CREEK BASIN DAMS - C.E.

PAPILLION CREEK BASIN DAMS - C.E.

BUREAU OF RECLAMATION DAMS

SUBIMPOUNDMENT DAMS (TWO) - C.E.

APPENDIX 2 SUMMARf OF ENOINUIIIND DATA - FEDERAL RESERVOIRS WITH AUTHORIZED FLOOD CONTROL MISSOURI RlnR TRIBUTARIES - U.S. ENGINEER OIITIIICT - OMAHA CORPS OF DIGINEEII OAMI

!101 BOlt HOO~ Sl/8JECT BEARCREEK BOWMAN HAtfY sconcootu C£0~11CANYON CHATfiELD CHEII~VCIIUK COlD BROO~ C000fjW000 SPIIINOS KHlYROAO PIPESTEM "' Gt~!R.ll loeol..,oldom 6ml o!HoltJ. ~o lml SW DIO.o..,,Colo w 1 ml S OIHom. 11001 31"" w .. Ropldtl30 '"IIOiol\\!.0 I?Oiol )6.461 06mi.OIOI" :1171 Normol~ Juno 19M 1000<11 Sill! lUll - 6.0110ch Apr\((\le9 u., 1<]11100 '"~~"''909 PtOO Sill ~" :lel\0 191\0 13110 53t.JOYI.,Hmt> 1!.011 10 loogl•o!um •• n I.JOO- mo" !,100- S..i!> !90018HI IIOO(SC) !llO ll,l:le um ll Holgllloldom- ~ ... 1191-·,....,6\- S..o• ll!BH I 13(SCJ SWJ ___ ,...., ·~ron II Sl< ..mt>od- h MSt 1,510 "' "" "" "111S 114018 HI 1WHSC! "3111 ~'" ~"' "' "' "rno 1) AMmonllort!\11.., c ..,.,.,,. •mo10n1 ,.od,lono lUOIOW, ...., <.. j. ol>ly >>"~ G,.,,.,,,,,,.,,,,., ... Min""""'""""..., Sanl ...... ,.., •.• '"'Soodrtono.•"""·'""''""" ""lollnnollii,.JmorlonO IMd)< .., SoMjcr•Utdoo- P Sllolt II I)JIO 0(1~ ROI'oh,.th -oonn ~~ltd ..... Rolltd•n• 11 ~~~ ....,,,,.,, .. ""' 11,3-ISO»-- IIU,OOO-Sruf> I,JOO,OOI'I ..... U!.OOOO ""''"" .. "" lU~.ooo -I)OtXIOOO l.o/1.000 9!.0.000""''"""'"" ,.~ ""''"""'""l,nD,OOO 15 0.10 .. '"'"' Jul1911-·· Aol 19Eo5 Oct !955 Sop 1959 Au1 1913 Sop( 1!1!1 ...,1969 Ro.,~ 1!1111 J,l191l ·-- ··~ ""' 1913 l1 IIIIOOIIMIOI"(WIOICI ~·~ uo,1119 Ml' 1969 J'" 191!1 """'96ll Jon 1963U~I) .... , 1911 SP11~ ~II II OIS!IIf~>tlly-06 IM.OOOtlooltl Sill!! 363!.0<'>11~ 56)8, 110.6(10)<1iOIOIJ61iJl 39.6(10)cb0101 39!.03 131110 SUOOnl•olltlo>!"""<,.....,·~ '"Unptflloonnno~cnm uo~"""'""'"'"'"" u"~'"''"' ,., .. ~ Uo;a!Odcon~Q'09<»ul0 "-·U'V'II

11 r.rumu"',.., lllo 1!.011 11Jio !IH~ 19181 16050(~H &SCI li!.06 ssz1e 59111 56361ill •~-<•• ~" 119• 710\o tl IOODIJioodOIJ UIIOZ/1190 71 06\Af 1\93016010 31-00AF 35160·311!0 .. w '>4311'>000 106 9<\AF !>15eO·S611111 !12i!O!IJ' !5110·3651. U>$0Af 3117\0:H:ISD 7./JO,tl 130111-\3610 11414·1496! lli.OIOo\1 111!0 11110 1.11/AI 1710011108 ll,l!liAF 5:111·!031 ll.lltAF !r;o.IOW.OO 11.eo\AF JIOIO·JIIH >m• lWO:IeiiO 119Af \41\014lell Uogllocldrop~IOI -el ~~~~ 1-3<6" 'J0r"'~ ""'" 1- !lin """'· lu•I!OOI< I-"'" •rdiOolc ~ldo !-It( h •r.!t-g.lltOII g.llt I- 301n ln~" 1-1110 bfi>IOOo>to• 1-lln '''"" GoiHO.~I-01 ll'IO 1-3&10 ,.,0,\ldll Sl>dt 1- 30rnlriiO<"">I>di001t , .. 711nho'"''~' 1!0<110101 36000 Glo13<1•111S9J- BuiHOOk ,g,,, .....l-<1 erooc•ootOI 11~n ISO~ ot ol ]6111 ~ ...... 39360 1300cloott11196l 1, I &I'"" .. !.661 1000 '""" 1100 0 110<1>0101\1610 301• ..~. IOO

MRO,','r.':, 1591 (II Co~•i'HODI9D80 (11-.oolllllojSp... l~""f""'l'lu,J (Crt" E~'''""l/801 h "Sll iJIW.Io~•N>tyOro'Og-o

ll!M O.O.M NO 2 DAM NO.~ DAM NO & DAM N0.8 SUIIJfCT DAM NO. 10 DAM NO 12 DAM NO 13 DAMNO 11 DAM NO. 11 DAMNO. IS ~ )OIIveCrNklokl) (Biuo Slim LU•I (Wo~ Trlln lak•l (S1ag..col(h lake) fYonk" Nlllloko) l(;of>ll1oglllkl) (1..-lnlokeo) (Po,.noollkl) (Ho1,.,11 Pork Ukt) lllronc~odOokUko) GE~IAAL 2~rnl W o1 Sp<>w'JI I ~ml ~ ,jM~~f!d I rnl S OIH~k ...n SildgOOillrll:dn lot.ll .... o!6Jm 1 rnl I ol '""'"' 3 ~"" ( .. (lod-000 s '"~ .. O< ... II< N IFUocdn.N£ ""'' .... sors ·- .. 6'" .... dis< ...too!•-~ '"' '"' ,ro)o00 11'>00 liOO 0 !01~·~· 0 11000 S1000 '" l00 "" "" c...,._.,...., ChJ- uod '"" " Af>u...,OIIorm;ol.,. c~ 1 - uod- ,.1 Clay-- Uod (lay·- •1'>4 c~,-·~· ""'- oll Clay- "'d ChJ- ""' c.. ,- $0'1d- '" lloni"J"' l\!,000 -111.000 ,_""'""."" l1lOOO ,_ ~ ,._ ()olloi<~Su•o ZIISop I'll>) 11Sop 1961 2!S.p 1961 11 ~u~ 196J ~ ou 196~ 1!~1963 16 Sop 1961 I~Jul 196-1 11S.p 1!161 11 Au; 1!161 " 110)19&1 1SIIor 19!9 " 0010ol"'ll..0"1l J,'lJvn 1!16S ~ Jul 196l l'Juo 19&) 2~ u., 1~61 -10Jun 1!161 ·- 2\ Jun 196/ 2Juo l'lfil llho 1913 " SPRlW~I 111101011)111 DII<...,Qi!!2 112000folll616 19i/\Ofol11691 IIOOOftl\1691 " C30 1l6l ~ 11560 1)110 " w..,,_" ••• ... •• 0 '"" .•. .. mo ...U"i'IOCI<.Irl't11>nn~ Un;ototll""'" U•g•"~ '"" thlnoel • Go..,,..-,,lro.two un;oii:ll 13111 1:1311 omo 11\116 111;18 12~1 1\\A 131511 12691 1!11A ... )II A ... 1/ill ... ~· lilA Ill~ 0 omo m• o 1opoltl00dt""Y~pool 1)!.00 lllll ll0/0 "" 118!10 ·~ 1/620 "" 12120 "~ ~· " Topol!'>nl""'pool ~· ·~ ~· "" "" 11441 IliA 11•14 lilA 1/640 11110~ " Topooc""....-.'""'pool IJlSO 13014 11!18 11111 1IU9 lilA ml9 IloilO ·~ I;)JA 11000 111~ I 11/0A " Topol ....-lpool >3110 "'"\IU ~·, 11!•6 "" 12111 12119 1111!1 ·~ 1llll "" >1443 10/A •" •m• .. "" ·~ "" '"' ,_'"" STOII.OGilOH!S!! .... c.poc!!r! ,_ 1]110-llll) 1]!1)0\lSII 1\IIOAF 1)11Sil311 I! I SAl 1:101011098 l/!1 0 11~1 fi ll/!lf 11610-11611 lll1Af 11\1011~1 II'SAF Ill~ 0 I )II 6 116JI126i\ 1193.'.1 11tie0·11691 ISJ•AF 11Ul·116)! 2ll2'XIAF !21101!r.&O 13!Slf 111•0131\0 1\!IOAF'"lOAF Su""''"'""' 1J3!0 1)!.00 :l'JIIO>f 1)01 1·\322 ~ III)Af 12Sl!IJOJ10 619QAf !111 !-11!10 010011 !2H911!20 ~UUF 11]19 11S20 1).1!0-ll\\0 " """'~.- ...., ... """ JoiniUH!""' ... -~· 12IIJI!UO 111011lf " -· 8IOAF 11<001111< IIlli 13061-1)014 1/146-!1!11 no~• 1!<19-!1449 suu 1331113010 ·~ 11!.00-ll/11- ll!'IOAF " 161(1.lf 1JOfJDill1< WI1Jlf 111160 12lll·- 1!26lf 1111011000 6J1Af • c""'""''"'"'""" 1100011!06 IWllF >10&0 lUI 1 >!1411-'F 111W 11910111H - I)IIOIJJ\0-· 1190AF 11110-IJO!i\-· 11180 ''" 9 $1<\""0ipoolz ..... - I~)I.F ID&OOlf - 23116lf 6190Jol 91~1.1 91110Af ·- f.OOOAF " GrosoS1or'9"th16'' lll1;.111-116!0 I-Jr6"•16 l•llll'lt-12110 1-36 -,)i"l"pt• 11130 l-<1'->14"lr11go10 ·lllJO 1-<1 •50 'l•IIQ>11-Il)&Q 1-36 •31i ldlpiO ·11390 G>ltd <><1~1> !~0 - s!zo - lypo - ln,rt tin I '"1-:!1; "•16' ldlll'" ·lllCIO 1-:!1;' o)i- t~lgo11- IJ(llO '" "' "" "" " "' 1-11 •12''-11111 I-tS o&3"-11!.00 1··30'"•96 -1241 J 1-14 'oil -1111 0 1··ll >110 -11"' 1-JQ'"•!IIi --12090 Un;.otO(I<>10 --mso 1-11 ·~ ·-llOII m " Olot~ '>00< - t1,l,liW.. diFC 10001 " " " • " " '" "' • F!IWER !~S!AlLO.!!ON • Hd$i!Oollll<"'ot' Mo '"'''lln9"'QII""'""" •.. l'lloiUpotily " -I'II•IO~cbcoi'O

Ill '""' pl !nc~~'"i 11 01m• ~ 111.011,000 lrom ••• "oi9-JI!-IIOI SUMMARY OF INOINIIRIND Olll - FEDIRll RISER,DIRI WITH AUTNOIIIZIO FlOOD CONTROL MISSOURIIIIWIII TAIBUTARIIS- U.S. INGINUR DISTRICT- OMAHA PAPilliOII CRUK BASIN - NIBRASIU.

DAM NO. II OAMN0.16 OAM NO_ 18 OAM N0.21l Ill... 6UBJECT .. iGioon Cunnln~nom loko) (SIOM1n~ aoor LoOo) IZ<>rlnoky l&kO) (Wo~'""'"" loOo) G!N!AAI. lOUI""o!,.., 9)rdSIIIISI'IOI lllo40Ao!Foo1S1oeol lr.&lhoo4 'T'SI!ool lr.&lnoo4GIIu- l"ll"ll'l'8'11POOQ- a... oldouc-- trOI Sowm&ronchP>piG- ~~ .. ~ ..... "'II"~'"'- Dr1;,ogo.,.,,"'- ., • A-~OQI""'''"'" "" "' "' LOCII""'o!--< " " " " ,,...,,..,... ,...... Rivt, IIOHMO IIDHo>"' 1-IDIIoof'l IIOHou" Ml

DAM AHO iM!AHkMt~l ,..,.,.....,_.~ 1111 l!lOO IU)j 1131 ' Loogl'otdo..,-n ... ·~ 1110 " H<'IJhIO-h "'IL " , " 10191 "••• .• ,~, ·~ " Abolto'IO"' loooflll(lfl .... ,~,,,.. , ,...... toontllyiOI" loontllylooll " lyptdiOI Rolledoonn Rollodwln R~oed eorlh ~-oonn " fl0q<>OM•1!Ifl"'"' ~16.000 """) IUO(I o.m 30,000 "~ Crttltll< - n MSL 1111 1111 11181 ~ ~ ,. •• "" ""'""- U~lod.,rtnc ... ooOI Ungolod.,rtnt"''"" GoiOo_n;-.•~o.l)-po Uo901t

SIOR.IG!"lONES!!,.,C!i!OCot!l Surc•IIGO IJO!IUI 1,00~ 11111111 1 OIO~F 11111113&1 1,21So\F \1131-11!1! I_I!W 109\ll-IIIJI FK>od<"""" 1111-1101 13.19'l.<.F 11011111 HlOAF 11100 Ill! 2 1,5$\AF a.mAF " 1081-1121 3.16/AF 106tl11GI l'iOOAF 106tl\11100 31/0AF 1061-109\ !J !612AF " "'"'""''po<-0 I,IOIAI " Gronllor>go(b~ o!"O

OU!\EI WORKS I -ACP--36 ... ,...,.1 I- RCP- II'"~'"""'"' .. 19 M""'!IO< '"" olro- "'""''' I - I!Cf- '>4" ~~""'" 1-Ac~-~~ ~-~· JO Cond""IO"'II"-" 610 .. •• 31 lloSllio -SI!O-ItiWrlt....- -· IISl) 1-10'o00 1121 •2-1 O'o!l" 11000 ""2 -I l'>ll" 11100 1-111'•31""" 111'1113 1-1 s·.to' 1111\ 1-10'>10 11090 I -3 !l'oiO IIIII 1-Hio$0 11031 ·- MRO ,','r,'l,1590 (!I tol!oooiiUI Ill 8o'""~oo...... -01Ju~1!MII~o ... ltioodl~-·p *"tho"ff''llom l(l960n MSL 10109\ll" "'st SUMMARY OF ENGINEt:RIIfO DATA - fEDERAl RESERVOIRS WITH AUTHORIZED FLOOD CONTROL MISSOURI RIVER TRIBUTARIES - U.S. ENOINEI:R DISTRICT - OMAHA BUREAU OF RECLAMATION DAMS

Boo..,.,..~ 1!10 ~>1ol ~WI~ Dlllooi,I.IOOI 15IIOJSIOlii•MfOOts 312GUSJon 19011 1\1,\01,000

WIO IIllO

""Ul ~ .. ~151 1016'" '"H11 s,..,,..,.,..,....,~ Sol>!!- boOio•"l~ ''" $.100 "''''171 Juo 1963

.. ~ 111.000 "" "" ... , 1!111 !l1(g""l\ ·~· ·~· 1915 •• Ul'f'IOIS-~olr U"f""" <~uiO " Unp""-*~' "'

11111 IO,IlOo IIIII 1111 I 13, 1l0o ~ill I

00\1000'193 00160.UIIO

-9$:>111 m l -11\oiiiPI SOolO 1 ·-l~llll Slodo f- "'" Joi•O~tl 1-l•!lll'" Sl"" '* '"' Min -!.40 61~ ... 5/10 - "* ""

! - IO.!>OOHP 1-I!>OOI

Ill 1-eooiO IO«mj>>IOIh\911 do ..... lnl>lOo\o\30201

ll1Po<""'P..,."IIri\1.0<1111MIInl!ill PERTINENT DATA PERTINENT DATA

SPRING CREEK DAM SNAKE CREEK DAM (LAKE POCASSE) (LAKE AUDUBON)

~ · On Spring Creek ar• of Lake Oehe, at Pollock, South Oekote ~·On Snake Creek ar• of lake Sakakawaa, approxl•etely 12 •Ilea northeast of Garrison De•, North Dakota. ~ · It Ia a road relocation route for the area Inundated by Lake Oahe. Control structures ere provided to regulate Lake Pocaaae for flah fY£2211 · fhe dell end reservoir are a relocation route for end wildlife, end recreation. transportation facilities end utllltlea which ware Inundated by lake Sakekewea, a regulating reservoir for the Buraau•a Garrison Diversion ~ !riJ · 660 aq. 111. (224 aq. MI. of which Ia non-contributing}, Unit, and provide for fllh and wildlife, end recreation.

W trul Elllbanlsptnt m.!.nJ.U !r.J..t. • 250 aq. 11t. (110 aq. 11!. of which Is non•contrlbuting).

fypa of fill • Rotted Earth ~ ~ Embankment Top of Oe11 Elev. · 1625 ft. MSL Length of Dell • 1,200 ft. fypa of fill · Rolled Earth Height of Dell · 40 ft. ltaXIMUM Top of De• Elev. - 1865 tt. MSL Stru•bad · 1585 ft. MSL Length of 0.11- 12,900 ft. Date of Closure · 1961 Height of Dell · 85 ft. ~axi•UII Date of Initial fill - latwean 1961 and 1964 Strealllbed • 1780 ft. MSL Dett of Closure - 1952 lR1llKlx - Nine 6 x 8 ft. uncontrolled box culverts with a treat Date of lnftlal fill · Sept. 1975 elevation of 1617 ft. MSL. l2!11Htl - None {An original dealgneted ungated spillway of S - 60• Rueryqlr unattqne 6ill lll!l '-IOlli.Ut culv,rta with a crest of elevation of 1850 wee filled In and cloeed In 1972 when the e~ankment wee widened to provide for a tour lane highway. !.L. m 4illi ,!,C[!'f!!U It waa locetad 180 ft. north of regulttlng conduit).

Top of EMbankMent 1625 2,560 26,000 Rneryolr Uevttlons. 4!!J 1!151 ~ Spillway cr.. t 1617 1,520 11,000 Top of Mid-level Outlet 1614 1,130 7,000 attn Acre· feet Invert of Mid· level outlet 1609 500 1,440 Invert of Low-level Outlet 1602 60 1,000 Maxi~ Nor••l Operating Pool 1850 20,620 396,000 strultbed 1585 0 0 Mini...,. Nor••l Opertting Pool 1847 18,780 316,870 Top of Inactive Pool 1810 1,450 11,180 !hU.1.t1 HlJ:.kt One 5 ft. CMP conduit with a 5 ll S ft. sluice gate, Strultlbad 1780 0 0 Invert elev. 1602 and a 5 11. 12 ft. overflow roller gtte, invert elev. 1609. !2!lll!1 ~ · A 7 x to ft. reinforced concrete conduit, Invert tlev. 1810, regulated by a 7 x 10 ft. sluice gete. An external crant Is required to operate the gtta. Located tbout 1,p00 ft. south of north end of ••In e~benkMent. Dltcherge ctpaclty 2,100 c.t.s. under 15 ft. heed dlfferentiet. fwo 7 x 10 ft. bulkheads one on etch tide of sluice gate. stilling basin on Garrison aide. CORPS PROJECTS

BEAR CREEK DAM BOWMAN-HALEY DAM BULL HOOK DAM CEDAR CANYON DAM CHATFIELD DAM CHERRY CREEK DAM WESTERLY CREEK DAM COLDBROOK DAM COTTONWOOD SPRINGS DAM KELLY ROAD DAM PAPILLION NO. 11, NE PAPILLION NO. 16, NE PAPILLION NO. 18, NE PAPILLION NO. 20, NE PIPESTEM DAM SALT CREEK NO. 2, NE SALT CREEK NO. 4, NE SALT CREEK NO. 8, NE SALT CREEK NO. 9, NE SALT CREEK NO. 10, NE SALT CREEK NO. 12, NE SALT CREEK NO. 13, NE SALT CREEK NO. 14, NE SALT CREEK NO. 17, NE SALT CREEK NO. 18, NE BEAR CREEK DAM AND LAKE BEAR CREEK, SOUTH PLATTE RIVER BASIN, COLORADO 1993-1994 REGULATION

The Omaha District entered into two temporary one year storage contracts for municipal and industrial water supply under Section 6 of the Flood Control Act of 1944 (Public Law 34, 78th Congress), pending development of a long-term contract under the Water Supply Act of 1958 as amended (43 U.S.C. 390 b-f). The first contract dated September 17, 1987 was for 25 acre-feet with the Indian Hills Water District. This contract was renewed in October 1994. The cost of storage per acre-foot in each of these contracts is approximately $2735.00.

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 June 20, 1988. This memorandum supersedes the previous MOU dated May 11, 1977. Under normal conditions the Bear Creek Dam outlet works is 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 is one foot into the flood storage zone and was selected to allow flexibility in targeting authorized pool levels. Bear Creek Reservoir was not made operational during the report period as has been done in the past.

The State of Colorado, Department of Natural Resources, Division of Game, Fish and Parks, in a letter dated October 1, 1970, agreed to provide water for the initial filling and replenishment of evaporation losses from the recreation pGJol, by purchase or other means, consistent with Federal and State laws to assure effective operation of the project for recreation.

In January 1992, the Denver Regional Council of Governments (DRCOG) requested Corps of Engineers participation in a demonstration project at Bear Creek Reservoir using hypolimnetic withdrawals throughout the year. The water quality in the reservoir and downstream of the reservoir would be monitored to assess the effectiveness of this management practice on water quality. The Corps of Engineers would make variable releases throughout the year depending on the inflow. The table below shows the approximate release targets as requested by DRCOG.

3.1 STREAMFLOW RELEASE > 20 cfs 10 cfs 15-20 cfs 7-9 cfs 10-15 cfs 5-6 cfs < 10 cfs 0 cfs

Release changes were made weekly as needed throughout the year. Also, this year the District 9 Water Commissioner requested that a minimum of approximately 3 cfs be released through the low level outlet to maintain water in the channel if Bear Creek Reservoir were to drop below elevation 5558.0 ft MSL.

Runoff during the report period was 49% of normal. Snowmelt runoff occurred during April and May with inflows reported at 64% of the historic average. A total of 173 AF or .6% of the 28,757 AF flood storage zone was utilized at the maximum pool elevation of 5559.57 on May 10. No flood control was achieved during this period.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 910 cfs May 01 80 800 cfs May 5-12 80 2nd 690 cfs Jun 10 79 800 cfs Jun 12 79 3rd 625 cfs May 23 83 605 cfs Jun 29 - Jul 02 83

Pool-Date Highest 5581.0 Jun 23 83 2nd 5576.3 May 19 80 3rd 5567.9 Jun 10 79

Minimums of Record (since initial fill):

Pool-Date Lowest 5556.98 Feb 09 82 2nd 5557.08 Jul 09 86

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 17,670, 49% of normal 17,336, 49% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 175, May 10 165, May 10

3.2

-~ --~--- Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 5559.57, May 10 5557.95, May 21

3.3 BEAR CREEK DAM POOL ELEVATION 5559.6 TOP 0 FLOCJ p com ROL Ill NE [E 5635 5]

5559.4

5559.2

E 5559.0 L E v 5558.8 I II ,.N T 5558.6 II \ M s rl' L 5558.4 /rv II /' ' ~ (\ ' J\ ~ lr\ f\r-.J 5558.2 .,_ t1 ~ ~ ll v f-vJ'~ \ \ -J {\1 5558.0 TOP 0 MULf ~PURPC SE 11:0 E [EL 5558]

5557.8

AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL l993 l994 5590 -,------~------~----~B~B=~TR~C~R=B~B~K~D~AM~~P~O~O~L~B==L=B~VA~~~I~O=N----,------,------ . ~OP OF LOOD COF~ROL z NB [BL 635.5}

. 5580 -1------1------1-----t-+------+------~------~------4------4------

- - 5570

B - L E v 5560 ,.ft"2'!.."1--...t •::t: -- l'lo .~ ~- I -- ~ ~ -::!-."'-...... --!'...... :!.-b!'L'lf N - - ~OP OF j.rUL~IPUR!POSB ZOl If [BL 5~58} F ~ 5550 M s L .

5540 -

5530

- - 5520 I 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 BOWMAN-HALEY DAM AND LAKE GRAND RIVER BASIN, NORTH DAKOTA 1993-1994 REGULATION

In anticipation of substantial spring snowmelt, the low level gate was opened in February and wasn't closed until June. An estimated 6, 615 acre-feet or 31% of the total 21,382 acre-feet that was discharged passed through the low-level and mid-level outlets.

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 1,124 cfs Mar 14 79 3rd 1,770 cfs Mar 11 72 930 cfs Mar 30 83

Pool-Date Highest 2762.66 Mar 28 78 2nd 2758.50 Mar 13 72 3rd 2758.08 Mar 30 71

Minimums of Record (since initial fill):

Pool-Date Lowest 2747.57 Jun 12 92 2nd 2749.17 Jul 31 91 3rd 2749.93 Nov 16 81

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 20,987, 103% of normal 21,382, 146% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 578, Mar 06 242, Mar 17

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 2755.93, Mar 16 2752.29, Jul 31

3.6

. ------BOWHAN-BALBY DAM POOL BLBVATION 2765 TOP ( 1!' FLO D CON PROL Z PNB [ll L 277'] -

2763

2761

2759 1!: L 1!: v 2757 TOP 0 MULT PUR POf9'B ZOI B [BL 2754. 1 I ...... __ ~ N r-.... 2755 r------F r---=:- -~ T '\. M 2753 s '\. L 2751

2749 -

274 7

2745

AUG SI!:P OCT NOV DBC JAN FBB MAR APR MAY JUN JUL 1993 1994 BOWHAN-XALBY DAM POOL BLBVA~ION :3765 ~OP ( F FLC OD C N~IIO ZONII [BL :3777 - :3763

:3761 - :3759 B - L ONB BL :3~54.8 B v :3757

I N :3755 --- I~ F $ \ ~-- v $ ~ ·~-- \- ~

M :3753 s L :3751

:3749 -

:374 7 - :3745 ' ' ' ' ' 1967 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 BULL HOOK-SCOTT COULEE DAMS MILK RIVER BASIN, MONTANA 1993-1994 REGULATION

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.

3.9 CEDAR CANYON DAM (RED DALE GULCH) RAPID CREEK BASIN, SOUTH DAKOTA 1993-1994 REGULATION

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.

3.10 CHATFIELD DAM AND LAKE SOUTH PLATTE RIVER BASIN, COLORADO 1993-1994 REGULATION

Before the dam became operational, the Corps (CEMRO-ED-HC) 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 March 30, 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 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 May 1 through August 31, 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 .

. The pool was close to or slightly above elevation 5432.0 ft MSL beginning March 27 and remained near elevation 5432.0 ft. MSL through April 15, 1994. See pool elevation plot following this section. The total inflow for the reporting period was 78,581 acre-feet (48% of normal).

Flood storage space utilized was 145 acre-feet of 206,945 acre-feet or .1% of the flood storage space at the maximum pool elevation of 5432.10 ft MSL on April 11. No flood control was achieved during this period.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 3,370 cfs May 30 83 3,034 cfs May 15 84 2nd 3,155 cfs May 09 80 3,027 cfs May 27 87 3rd 3,030 cfs May 15 84 2,858 cfs Jul 08 83

Pool-Date Highest 5447.58 May 26 80 2nd 5447.08 Jun 30 83 3rd 5445.97 Jun 16 83

3.11 Minimums of Record (since initial fill):

Pool-Date Lowest 5424.33 Nov 21 90 2nd 5424.46 Nov 17 85

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 78,581, 48% of normal 71,770, 45% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 865, May 26 689, May 11

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 5432. 10, Apr 11 5426.34, Nov 08

3.12 CHA2'FIELD DAH POOL ELEVA2'ION 5433 2'0P 0 IF FLOC D CON ROL Z NE [E 55011

543.2 A - 2'0P 0 r HUL~ TPURPC SE ZO E [EL 54 321 - - jV 5431 II - E - I L l--- E v 5430 I I N - v F - 2' 5429 I v - "s / "' L -

5428 I 1/

54.2 7 /'" / ~ 1/ \/"- i}'v ~ - v - 54.26

AUG SEP OC2' NOV DEC JAN FEB liAR APR MAY JUN JUL 1993 1994 CHATFIELD DAN POOL ELEVATION 5450 TOP OF FLOOD CON~ ROL ZONE [EL 550 OJ - - 5445 i

• ! !

5440 ~! -

E - TOP oF H '1LTIPURPOSE ZONE EL 5432] L 5435 1 E - v I~J ,...... , ------rl -~ -~- - ~ -,-, - I - rr" '\1 ~--rrl~ "l N 5430 I' F T ~. ~ ~ ~ H i/ s 5425 v L -

5420 -~~ 5415 - WI - - 5410 ' ' ' ' ' ' ' ' ' ' l976 l98l l986 l99l l996 CHERRY CREEK DAM AND LAKE CHERRY CREEK, SOUTH PLATTE RIVER BASIN, COLORADO 1993-1994 REGULATION

Corps of Engineers dams located above populated areas are designed to store and/or 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. The most recent precipitation estimates for this area, published in Hydrometeorological Report No. 55 (HMR 55) in March 1984, were applied to the Cherry Creek Lake project. It was found that the reservoir could safely pass no more than 63% 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 PMF was selected as the base safety condition or design goal for the alternatives to be developed in accordance with IWR Report 86-R-7. Downstream from Cherry Creek Dam, the peak discharge for the PMF and floods less than the PMF would increase greatly with dam failure when compared to the nonfailure condition. 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.

A number of alternatives are being considered to enable the project to safely pass the PMF. The alternatives included widening of the existing spillway, adding a new spillway at one of three locations in the embankment, constructing an additional reservoir (Castlewood) about 30 miles upstream from Cherry Creek Lake, hardening the dam face, raising the dam crest, and no action. The alternatives are being considered individually and in combination with each other.

The Reconnaissance Report "Hydrologic Improvement Assessment, Cherry Creek Lake, Colorado", September 1990 has been reviewed by Missouri River Division and was approved in June 1994 by Headquarters, USAGE. Funding has been requested for the next phase, the feasibilty report.

Releases from the project are made to evacuate flood control zone storage and to meet downstream calls. Each year, water is released from four of the five gates to flush accumulated sediment.

3.15 The flushing operation to remove sediment from the intake structure was accomplished on May 18-19. Releases consisted 320 cfs for 15 minutes from each of the 4 gates. Sediment within the intake structure around the gates was successfully removed during the exercise.

Inflows to Cherry Creek Reservoir for the report period were 7653 acre-feet, 99% of average. The peak monthly inflow occurred in April, with 1465 acre-feet entering the reservoir.

Urban Drainage and Flood Control District continued their work to improve the Cherry Creek channel downstream of the dam during the report period. Several drop structures and channel stabilization projects were added in this reach. Work was also being done to the channel near the golf course just downstream of the project. The golf course was adding several streambank protection projects and across bridges.

A total of 772 acre-feet or about .9% of the 79,960 acre-feet exclusive flood storage zone was utilized at the maximum pool elevation of 5550.90 on February 22. No downstream flooding was prevented by this project.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 6,150 cfs Jun 16 65 560 cfs Aug 7-8 65 2nd 3,195 cfs May 06 73 375 cfs Jun 08 75 3rd 1,440 cfs Jul 24 83 330 cfs Apr 23-May 1 83 May 28-Jun 2 83

Pool-Date Highest 5565.82 Jun 03 73 2nd 5562.52 Aug 01 65 3rd 5557.89 Jul 25 83

Maximum Hourly Inflow: 56,000 cfs 7-8 p.m., June 16, 1965

Minimums of Record (since initial fill):

Pool-Date Lowest 5543.51 Jan 29 65 2nd 5545.90 Nov 23-24 78

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 7653, 99% of normal 4734, 93% of normal

3.16 Peak Daily Inflow (CFS) Peak Daily Outflow (CFS)* 61, Feb 22 75, Feb 23

• Not including flushing exercise

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 5550.90, Feb 22 5548.83, Sep 12

3.17 5551.0 CHBRRY CRBBK DAN POOL BLBVATION TOP 0 F FLOC D CON ROL Z ~NB [B f' 5598 - - - 'j 5550.5 0 V\N v - IJ ~ ) ~ TOP OJ NULT PURPO ~B ZOll ~ [BL ~OJ \f' v 1\

_L / ' -V~ - ~ v -

5548.5

AUG SBP OC'l' NOV DBC JAN FBB MAR APR MAY JUN JUL 1993 1994 CHERRY CREEK DAM POOL ELEVATION 5570 TOP OF • .nnn ~· "'n"'., [EL i91 1

5565 - -

5560 -

E - L 5555 E v - - I - N ...rJ1 LJ\ ! IVtl 1\J. ~1\fi.Ak 1M II 5550 ~ v F - v \ \)' \J~ v !I' \J~ I~ - M mnn nP un•m.,. s 5545 ~ '"""n~• ~ ... '~~-.. L \., - ~ - ' 5540 v

- 5535

- 5530 ' ' ' ' ' ' ' ' 1958 1963 1968 1973 1978 1983 1988 1993 1998 COLDBROOK DAM AND LAKE FALL RIVER BASIN, SOUTH DAKOTA 1993-1994 REGULATION

Releases from Coldbrook 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 Coldbrook Reservoir inflow up to 1.1 cfs. Inflow for the report period was the highest since the dam was constructed in 1953. A wet fall followed by substantial winter snowfall resulted in the highest volume inflow of record for March and April. The highest pool of record was matched on March 1 resulting in the highest discharge of record, 4.3 cfs, on March 2. Even at this discharge, water being released only reached approximately 300 yards downstream before disappearing into the ground.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 74 cfs Jul 14 62 4.3 cfs Mar 02 94 2nd 65 cfs Jul 08 61 2.4 cfs Mar 23 87 3rd 40 cfs May 19 82 2.0 cfs May 16-20 72

Pool-Date Highest 3585.38 Mar 01 94 2nd 3585.38 Aug 17 82 3rd 3585.26 Jul 22 82

Minimums of Record (since initial fill):

Pool-Date Lowest 3576.6 Oct 22 77 2nd 3576.8 Sep 14-0ct 02 81 Sep 21-22-77

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 1115, 203% of normal 968, 210% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 7.5, Aug 19 4.3, Mar 02

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 3585.38, Mar 01 3583.77, Sep 26

3.20 COLDBROOK DAM POOL ELEVATION 3585.4 TOP 0 r FLOO DCONTJ OL ZO B (BL 365l. ~] ·~ -" ~ >II " 3585.2 -~ f1 -v- '1 3585.0 TOE OF M LTIPU POSE ZONB EL 35 5] \ E 3584.8 L E v (\ 3584.6 ~ .__ I I N \ F T 3584.4

M s L ( 3584.2 J 3584.0 \

3583.8 \v

3583.6 AUG SEP OCT NOV DEC JAN FBB MAR APR MAr JUN JUL l993 l994 COLDBROOK DAM POOL BLBVATION 3590 TOP OF FLOOD CpNTROL

TOP OF IIULTIP~RPOSB _, ONB [BL 3585] 3585

- - B L E 3580 v u ,. 'V l' v I~ I - l/ N ~ - F T

11 3575 s L

3570 -

- I 3565 ' ' ' ' ' ' ' ' ' ' ' 1953 1958 1963 1968 1973 1978 1983 1988 1993 1998 KELLY ROAD DAM SAND CREEK BASIN, COLORADO 1993-1994 REGULATION

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 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 reponsible for obtaining pool gage readings during flood periods and general observaiton of project operation.

Inflows and outflows were negligibe for the report period. No flood control was achieved.

3.26 3865 CO!l'!l'ONWOOD DAJI POOL li:Lli:VA!l'ION !l'OP 0 !' I!'LOC D CON~ JIOL Jr Nll: {If 3936

!l'OP 0 ir JIUL~ IPUJIP SB ZO {BL 3875] 3860 v- - _/ -

3855 - ll: - - L - ll: - v 3850 I - N 1!' - !I' 3845 II s - L - - 3840 - -

3835 - - - 3830

AUG SBP OC!l' NOV DBC JAN l!'li:B HAJI APJ! JILII.Y JUN JUL l993 l994 COTTONWOOD DAM POOL 111L111VATION 3865

T P OF FLOOD CO TROL ZON111 [ 111L 3936]

T p OF MULTI PUR 08111 ZON111 [111L ~8751 I' 3860 -

3855 I

111 L 111 v 3850 I - N F - 1"'\ T 3845 ~ M - s - L - - 1\ n 3840 \ \'I - 1\. ~ - ,. - IV~ - \( \, 3835 , \ ~ ~

3830 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' 1972 1977 1982 1987 1992 1997 COTTONWOOD SPRINGS DAM AND LAKE FALL RIVER BASIN, SOUTH DAKOTA 1993-1994 REGULATION

Cottonwood Springs Creek dam is located on Cottonwood Springs Creek 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. Heavy rain occurred in the Hot Springs area late evening on the 20th of August, 1993. Hot Springs received 2.5 to 3.5 inches and the area around Cottonwood had an unofficial total of over 6 inches. This resulted in considerable runoff into Cottonwood, washing out part of the upstream road crossing and increasing the pool elevation from 3832.0 ft msl to 3854.0 ft MSL. Inflow caused the pool to continue to climb steadily to a peak of 3862.0 ft, MSL on June 25, 1994.

Maximums of Record:

Daily Daily Pool Date Inflow-Date Outflow-Date

Highest 3861.0 Jun 25 94 2nd 3847.9 Jun 09 79 3rd 3845.7 Mar-Apr 83

3.23 WESTERLY CREEK DAM SAND CREEK BASIN, COLORADO 1993-1994 REGULATION

The Westerly Creek Dam is located approximately 0.8 miles upstream from the Kelly Road Dam on the southern edge of Lowry Air Force Base. Construction of Westerly Creek Dam was completed in July 1991. Both the dam and the detention area are located within the confines of the 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.

Inflows and outflows were negligible for the report period. No flood control was achieved.

3.27 GLENN CUNNINGHAM DAM AND LAKE PAPILLION CREEK BASIN - NO. 11, NEBRASKA 1993-1994 REGULATION

The pool level remained in the flood control zone until November. The pool receded below the level for a brief time and re-entered the flood control zone in the middle of November where it remained throughout the report period. Precipitation and runoff kept the pool level in flood control zone. Heavy rainfall in June and July produced inflow of 138% and 117% of average, respectively. During the report period the third highest of record for pool elevation was observed and the highest of record for daily inflow was established.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 362 cfs Jun 22 94 152 cfs Jun 18 84 2nd 345 cfs Jun 15 80 116 cfs Jun 16 80 3rd 344 cfs Mar 02 79 87 cfs Mar 04 79

Pool-Date Highest 1124,4 Jun 17 84 2nd 1123.7 Jun 15 80 3rd 1123.3 Jun 23 94

Minimums of Record (since initial fill):

Pool-Date Lowest 1119.5 Nov 15 89 2nd 1120.2 Oct 30 90

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 8032, 104% of normal 3067, 50% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 362, Jun 22 81,Jun24

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1123.29, Jun 23 1120.64, Nov 08

3.28 PAPIO DAM 11 POOL ELEVATION 1123.5 - TOP F I!'LO 'D COli TROL ~ ONE [ L 114 1 - - - 1123.0

E 1122.5 L E v

I I~ N 1122. 0 1!' T

M s - L ~ 1121.5 ~ 1\ \ \j ~ \ f'l"'""\ ~ ~ \ \ ~ ~ lf ~ 1121.0 I TOP 0 F MUL'l TPURP PSE zo ra: [El 1121] 1/ 1120.5

AUG SEP OCT NOV DEC JAN I!'EB MAR APR MAY JUN JUL 1993 1994 PAPIO DAM ll POOL BLBVA'l'ION ll:Z6 'l'OP 01!' l>LOOD CC N'l!ROL Z NB [BL d4:Z] -

ll:Z4 -

ll:Z:Z II

B lie ...A [;. y. J I~ .IL l, - y ~ ~.{ \~~IA,J.. ~ _., ~\ L -~ -· ... 11 l-~ -~-~- B r·· (\ v ll:ZO 'l'OP 01!' !!.UL'l'IPUR ii'.OSB ZO tB_ UL l :Zl] I N - 1!' '1! lllB M s - L

lll6

lll4 -

lll:Z ' ' l977 l979 l98l l983 l985 l987 l989 l99l l993 l995 STANDING BEAR DAM AND LAKE PAPILLION CREEK BASIN- NO. 16, NEBRASKA 1993-1994 REGULATION

The pool level began the report period in the flood control zone. Below normal precipitation and runoff caused the pool level to recede below the flood control zone in November where it stayed until January. The pool level re-entered the flood control zone at the end of January. The pool level fluctuated above and below the flood control zone in February, April and May. The pool re-entered the flood control zone in June and remained in the flood zone throughout the report period. Due to heavy rainfall in June inflow and July inflow to the project was 262% and 195% of average, respectively. During the report period, a new third highest of record for inflow and second highest for pool elevation were established.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 266 cfs Jun 14 84 62 cfs Jun 16-17 84 2nd 235 cfs Aug 09 87 57 cfs Aug 09 87 3rd 211 cfs Jun 22 94 52 cfs May 22 82

Pool-Date Highest 1107.8 Jan 16 84 2nd 1107.5 Jun 23 94 3rd 1107.1 Aug 08 87

Minimums of Record (since initial fill):

Pool-Date Lowest 1095.9 Feb 28 91 2nd 1197.6 May 22 90

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 1975, 173% of normal 1738, 279% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 211, Jun 22 47, Jun 23

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1107.48, Jun 23 1103.30, Nov 05

3.31 1108.0 PAPIO DAM 16 POOL ELEVA~ION - ~OP 0 FLOO p CON~ ltOL Z( NB [E• 1121

·I 1107.5 - - 1107.0 :I : - 1106.5 E : L - E v 1106.0 - I N 1105.5 F - ~ - M 1105.0 s - L - - 1104.5 tv\ - - I~ v 1\. 1104.0 ~~ ~ ~ "" ~ : " ~ • ~OJ OF M L~IP~ I!. POSE ZONE 4] L ~ 1103.5 - I - v

- 1103. 0

AUG SEP OC~ NOV DEC JAN FEB MAR APR MAY JUN JUL 1993 1994 PAPIO DAM l6 POOL l!:Ll!:VATION llOB TOP 01!' FLOOD C NTROL Z PN1l' [ l!:L ll:Zl]

ll06

TOP 0 !' MULTIJ URPOSI!:

zo !l1f [ EL ll04] ll04 .I I' .l..l ~. .~ t..r l. ~ \)'{ '11 v \ \ \Jr 1!: ~~ L llO:Z 1!: v \ I~ I \ u l N \I\ I llOO l 1!' T - \ M .. s l098 \ L - ~\ yf l096 -

l094 l\o

l 092 ' ' l977 l979 l98l l983 l985 l987 l989 l99l l993 l995 ZORINSKY DAM AND LAKE PAPILLION CREEK BASIN - NO. 18, NEBRASKA 1993-1994 REGULATION

The pool level was in the flood control zone in the beginning of the report period. The pool level fell below the flood control zone early in the month of November and re-entered the flood control zone toward the end of the month. It remained in the flood control zone throughout the report period. During the report period precipitation and runoff were below normal. Heavy rainfall in June and July produced inflows of 97% and 61% of average, respectively. During the report period the second highest of record was established for inflow, outflow and pool elevation.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 530 cfs Jul 24 93 142 cfs Jul 25 93 2nd 423 cfs Aug 30 93 113 cfs Aug 31 93 3rd 181 cfs Jul 12 92 32 cfs Jul 13 92

Pool-Date Highest 1116.79 Jul24 93 2nd 1114.75 Aug 30 93 3rd 1111.31 Jul 12 92

Minimums of Record (since initial fill):

Pool-Date Lowest 1108.53 Nov 09 91 2nd 1109.55 Nov 05 93

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 6128, 123% of normal 6032, 153% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 423, Aug 30 113, Aug 31

Peak Pool Elevation (Ft MSL) Minimum Pool Elevation (Ft- MSL) 1114.75, Aug 30 1109.55, Nov 05

3.34 PAPIO DAM 18 POOL ELEVA2'ION 1115 2'0P 0 I!'LOO D CON2' iROL ZC Nl!: [ 1!: ~ 1128 2]

1114

- -

E 1113 L - E - v

I N 1112 F 2' - M s L 1111 - \ \ VA I~ r ../'--- ~ ~ ~ ~ \ 1110 - v 2'0P 01 MUL2' PUR PC s11 zo~ E [EL 1110]

1109 I AUG SliP OC2' NOV DI!:C JAN FIIB MAR APR MAY JUN JUL 1993 1994 PAPIO DAM 18 POOL ELEVATION 1118 TOP C F FLC OD CC NTIIO ZON (EL 1128 2]

1116

I 1114

E :,:. L 1112 E v - I y I~ _J\ .A I~JI... ~ N 1110 h J\ J [\ f-J ~"" F "' v T - ~ r-v TOP F MU TIPU POSE ZONE (EL 110] M ~ 1!"'"'' s 1108 L

1106 --~''

1104

1102 ' ' ' I I ' ' ' ' APII JUL OCT JAN APII JUL OCT JAN APII JUL OCT JAN APII JUL OCT I 1991 I 1992 I 1993 I 1994 I

• WEHRSPAN DAM AND LAKE PAPILLION CREEK BASIN - NO. 20, NEBRASKA 1993-1994 REGULATION

The pool level started the report period in the flood control zone. It remained there until November. The pool level re-entered the flood control zone in March and fluctuated above and below the flood control zone. It fell below the flood control zone in April and remained until June, but later in the month re-entered and stayed in the flood control zone until the end of the report period. Precipitation and runoff were below normal during the report period. Heavy rainfall in June and July had inflow of 97% and 61% of average, respectively. During the period a new third highest daily inflow was established . Also, a new second highest daily outflow and pool elevation was set.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 515 cfs Aug 25 87 124 cfs Jul 25 93 2nd 485 cfs Jul 22 93 101 cfs Aug 31 93 3rd 458 cfs Aug 29 93 77 cfs Aug 26 87

Pool-Date Highest 1130.20 Jul 24 93 2nd 1101.14 Aug 30 93 3rd 1099.5 Aug 25 87

Minimums of Record (since initial fill):

Pool-Date Lowest 1085.4 May 02 90 2nd 1085.9 Feb 02 91

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 6128, 123% of normal 3862, 98% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 458, Aug 29 101, Aug 31

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 11 0 1. 14, Aug 30 1095.21, May 28

3.37 PAPIO DAM :lO POOL ELEVATION llO:l - TOP 0 F l!'LOO p CON2 ~OL Z 'NE [E ~ 111 .1] -

1101 - -

1100

E - L E v 1099 I N -

F T 1098 - M s L

1097 -

v Pl!' NUl TIPURJ OSE Z NE [J L log, .8] - I~ '\ 1096 \ ~ ~ - -- f- -- f- -- +- -- r-- r- ~------"' - --- v------~ k 1095 "" AUG SEP OCT NOV DEC JAN l!'EB MAR APR MAY JUN JUL 1993 1994 PAPIO DAM 20 POOL BLEVA'I'ION 1105 'I'OP 01!' FLOOD ON'I'ROL ZONB [ ~L lll3.l] - -

llOO

'I'OP 0 MUL'I'IPURPOSB B [BL 1095.8] ------IL.or \..,----zo ------1\ ---- JJL~ II: 1095 L ,_) II: r- v ~ ~ I N 1090 \ 1!' - \ '1' - "i M '"\t\l\; \ s - r L 1085 !'

- N'

lOBO /

- ' -

1075 . ' ' 1985 1987 1989 1991 1993 1995 PIPESTEM DAM AND LAKE PIPESTEM CREEK, JAMES RIVER BASIN, NORTH DAKOTA 1993-1994 REGULATION

The large rainfall events in July 1993 resulted in record high pool levels, record inflow and record outflow for the fall and winter months. The highest discharge of record was made in October and November when a release of 568 cfs was made. This was required to evacuate the flood control storage by November 15.

A substantial winter snowpack and summer rainfall produced the highest volume of inflow for this report period since the dam was closed in 1974.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 4,374 cfs Jul 15 93 568 cfs Oct 27; Nov 02 93 2nd 3,380 cfs Apr 20 75 310 cfs Oct 22-26, 31; Nov 01 75 3rd 3,000 cfs Apr 18 79 303 cfs Jul 26 94

Pool-Date Highest 1472.64 Aug 14 93 2nd 1468.35 May 10 79 3rd 1466.28 Apr 15 87

Minimums of Record (since initial fill):

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

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 70,589, 272% of normal 104,292, 529% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 1553, Mar 22 568, Oct 29, Nov 02

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1472.64, Aug 14 1442.61, Feb 09

3.40 PIPESTEM DAM POOL ELEVATION 1475 - TOP 0 FLOO p CON'l ~OL ZC NE [E 1496 • 3] - ~~ 1470 ~

- \ 1465

. E L E - ~ v 1460 1\ I ~ - 1/ I N

F T 1455 \ \ M s - \ L

1450 I~

1445 \ - -- 1------1------TOP OF MU TIPU.R OSE Z ~NE [E fr- l4 4.< • 4] 1440

AUG SEP OCT NOV DEC JAN l!".EB MA.R AP.R MAY JUN JUL 1993 1994 PIPESTEM DAM POOL ELEVATION 1480 TOP OJ FLOOD CONTR DL [ EL 149 6. ' ] -

1470

E 1460 L - E v - I - N 1450 F - T

M s L 1440

- - 1430

- 1420 ' ' ' ' ' 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 OLIVE CREEK DAM AND LAKE SALT CREEK BASIN- NO.2, NEBRASKA 1993-1994 REGULATION

The pool level remained in the flood control zone during the beginning of the report period. It receded below the flood control zone in November and stayed until May. Due to precipitation and runoff, the pool level fluctuated above and below the flood control zone in May, June and July. Heavy rainfall in July of 5.95 inches produced inflows of 299% of average.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 764 cfs Jun 12 84 179 cfs Jul 25 93 2nd 749 cfs oct 10 73 176 cfs Oct 1273 3rd 730 cfs Oct 11 86 171 cfs Jun 13 84

Pool-Date Highest 1342.62 Jul 24 93 2nd 1342.6 Oct 11 73 3rd 1342.6 Jun 12 84

Minimums of Record (since initial fill):

Pool-Date Lowest 1326.63 Oct 28 91 2nd 1326.31 Jul 04 92

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 3468, 151% of normal 3506, 212% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 212, Jul 01 82, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1336.87, Jul 01 1334.26, Feb 13

3.43 SALT CR DAM .2 POOL BLBVATION 1337.5 TOP C I! FLOC D CON ROL Z ONII CB lr. 135 1 -

1337.0

1336.5

B L - B - v 1336.0 I N

I! - T 1335.5 M s L - 1\1\ TOP 0 SBDI BNT P ~OL Z NB [B 1335 1335.0 ~ \ ~ f\~ \ \ - \.,. \ fV ~ L.r----,_ f-,._ 1334.5 I"' I\ " ~ - ~ - 1334.0

AUG SBP OCT NOV DBC JAN I!"BB MAR APR !WIY JUN JUL 1993 1994 SAL'l' CR DAM 2 POOL 111LBVA'l'ION 1344

1342 -

1340 -

111 1338 L 111 'l'OP 0 S111DIME 'l' v 1336 -+t------t.-+---+t-----\---jft---1+------D• nT. "'""'"' lr- I N - 1- - f- --- ~----~Ym --- \ _ [111L !3!,5!_ i'fl F 1334 ~ 'l' \ M s L 1332 \ \ 1330 \ II ~I 1328

1326 ' ' ' 1965 1970 1975 1980 1985 1990 1995 BLUESTEM DAM AND LAKE SALT CREEK BASIN- NO.4, NEBRASKA 1993-1994 REGULATION

The pool level stayed in the flood control in the start of the report period. During November the pool level dropped below the flood control zone for a brief time and re-entered it in March and remained throughout the period. Heavy rainfall in June and July (4.31 and 5.85 inches), respectively produced inflows of 137% and 172% of average, respectively.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 1,477 cfs Oct 10 73 342 cfs Oct 12 73 2nd 932 cfs Jul 23 93 198 cfs Jun 13 84 3rd 911 cfs Oct 11 86 195 cfs Jul 26 93

Pool-Date Highest 1316.5 Oct 11 73 2nd 1314.5 Jun 13 84 3rd 1314.23 Jul 25 93

Minimums of Record (since initial fill}:

Pool-Date Lowest 1299.46 May 31 92 2nd 1299.77 Nov 13 91

Report Period: (August 1,1993 through July31, 1994}

Total Inflow (AF) Total Outflow (AF) 6640, 157% of normal 7415, 244% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 191, Jun 05 125, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1311.30, Aug 01 1306.71, Nov 08

3.46 SAL'l' CR DAM 4 POOL .B'LEVA!I'ION 1318 TOP OF FL OD CONTROf. ZONE [EL 1322. 5]

1316

1314

1312 E L E v 1310 - I I. I N 1308 r- ,... - I- ~ - -- 1.,- -- 1- 1- 1- - F - ~- -- -~1 !I' 1'\ 1\ u M 1306 Yl s \ L I\ \ \, v I~ 1304 \ - ~· TOP OF c DNSERVATIO \J 1302 tv' \ ~ ZONE EL 1307.4 \ \A 1300

1298 1963 1968 1973 1978 1983 1988 1993 1998 SALT CR DAM 4 POOL BLBVA!l'ION 1311.5 : TOP 0 )- 1/'LOO p CON2 jRoL z Nl!l {B r. 132< • 5] - - 1311.0 -

1310.5 : 1310.0 B L - B v 1309.5 . I N 1309.0 1!' !!' . M 1308.5 s . L 1\ \ 1308.0 \ 1\ 1\ i\ \} 1\ \ - !\ [\_ \r\ 1307.5 \ \ ~ -- 1- -- 1--- 1------; -- ~- 1------r ~ 1307.0 I/" 1 TOP 01!' CCl !Ns:t:RV !!'ION FONB ' \:t:L 131 7.4] I : v- 1306.5 AUG SBP OCT NOV DBC JAN 1/'BB MAR APR MAY JUN JUL 1993 1994 WAGON TRAIN DAM AND LAKE SALT CREEK BASIN - NO. 8, NEBRASKA 1993-1994 REGULATION

During the start of the report period the pool level remained in the flood control zone. In November the pool level receded below the flood control zone and re entered it in December. It stayed in the flood control zone until April then fell below the level and fluctuated below and above throughout the month of May.

Heavy rainfall in June and July induced the pool level back into the flood control zone where it remained through the report period. Precipitation of 4. 72 and 6.99 inches during June and July, respectively produced inflows of 249% and 109% of average, respectively.

Maximums of Records:

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

Pool-Date Highest 1295.4 Oct 11 73 2nd 1294.61 Jul 25 93 3rd 1293.2 Jun 13 84 Oct 11 86

Minimums of Record (since initial fill):

Pool-Date Lowest 1281.72 Nov 01 91 2nd 1282.2 Nov 28 75

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 6915, 156% of normal 711 0, 215% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 337, Oct 08 96, Aug 93

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1290.21, Aug 01 1287.58, Nov 05

3.49 SALT C.R DAM 8 POOL BLBVATION 1290.5 TOP 0 ir FLOO D CON .ROL Z ONB [! L 130 ]

1290.0 -

B 1289.5 L E v

I N 1289.0 F - T

M s - L 1288.5 ~

- - \ {\ \ .A \ 1288.0 \ \ ~ ~ ;-1~ \. - ~ ~------~ -J ~ -- ~ r-\ '- -- --~ - LJ TOP 0 CONS r.RVAT ON ZO E [BL l287. 8] 1287.5

AUG SEP OCT NOV DBC JAN FBB MA.R AP.R MAY JUN JUL 1993 1994 SALT CR DAM 8 POOL BLBVATION 1296 T OP 01!' T!'L OD CONTRO ZONB (BL 1302]

1294

1292

B L 1290 B v - I N llH. 1288 I ..,.. ~- \- - -- 1!' 1/? ~ I rt T - I\ ~·\ [\ ~v M ~ 1286 • s \..1 L "~ TOP 01!' ONSBRVATI N ltj ZONB (1287.8] \ 1284 ~

1282 UJ

1280 I I I ' ' ' . ' ' ' ' ' ' ' ' ' ' 1963 1968 1973 1978 1983 1988 1993 1998 STAGECOACH DAM AND LAKE SALT CREEK BASIN - NO. 9, NEBRASKA 1993-1994 REGULATION

The pool level remained in the flood control zone during the start of the report period. It fell below the flood control zone in November for a brief time and re-entered in December and stayed throughout the report period. Heavy precipitation in June and July produced inflows of 161% and 426% of average, respectively.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 958 cfs Oct 10 73 190 cfs Oct 12 73 2nd 829 cfs Oct 11 86 155 cfs Jul 25 93 3rd 776 cfs Jul 24 93 116 cfs oct 12 86

Pool-Date Highest 1279.0 Oct 11 73 2nd 1278.15 Jul24 93 3rd 1277.4 Oct 11 86

Minimums of Record (since initial fill):

Pool-Date Lowest 1259.60 Oct 31 91 2nd 1260.5 Aug 09 76

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 5173, 182% of normal 5399, 257% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 319, Jul 01 77, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1273.93, Aug 01 1270.52, Nov 08

3.52

------~-~~ ------. SALT CR DAM 9 POOL 1!1L1!1VATION 1274.0 - TOP 0 lr FLOC D CON~ ROL Z NI!I [B L 128~] -

1273.5

- -

1273.0 - 1!1 L - 1!1 - v 1272.5 - I N

F T 1272.0 - M s - L - - I .A 12 71. 5 \ \ ~ \ - V\ \ \ \\ ~\ \ \ '"' ------~ ~ \ ~ ------1271.0 -/-- - TOP pF Sl!IIJ IMI!INT POOL I!ONI!I l!IL 12' 1.1] - 1270.5 v AUG SI!!P OCT NOV DI!!C JAN FI!IB MAR APR MAY JUN JUL 1993 1994 1280 SALT CR DAN 9 .POOL IIL111VATION - !I'O.P OF FLCOD CONTROl ZON111 [111L 1Z85] - -

1275

111 L 111 1270 v v TO.P OF S111DI11111NT ., OOL I ZON111 [IlL 1271,.] N

F T -

11 1265 ~~r------r------~--_,~r-+------~r------+--+---+--r------s L

l( 1260 •

1255 ' ' ' 1 1 1 I I I ' ' ' ' ' 1964 1969 1974 1979 1984 1989 1994 1999 YANKEE HILL DAM AND LAKE SALT CREEK BASIN - NO. 10, NEBRASKA 1993-1994 REGULATION

The pool level remained in the flood control zone up to November. It then fell below this level, until the middle of December. It re-entered the flood control zone and stay throughout the report period. Heavy rainfall in June and July produce inflows of 84% and 39% of average, respectively.

Maximums of Records:

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

Pool-Date Highest 1252.3 Oct 11 73 2nd 1251.21 Jul 24 93 3rd 1250.7 Jun 13 84

Minimums of Record (since initial fill):

Pool-Date Lowest 1238.9 Aug 08 77 2nd 1239.1 Sep 19 81

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 9267, 179% of normal 960 1, 220% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 174, Oct 08 80, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1248.16, Aug 01 1244.55, Nov 15

3.55 SAL~ CR DAM 10 POOL ELEVA~ION 1248.5 - ~OP 0 P' FLOC D CON ROL Z pNE [J L 1:l6. ] - 1248.0 - - - 124 7. 5 - . I - ' ~ _, E i" ,,, L :.C-i>.. ~ 124 7. 0 E v - I k .t~- (,- N 1246.5 i~: ..,..._ f ¥'. F i ':J: ~ : Ll M \ . -t\- 1:l46. 0 \ s 1\ \ L -

- 1:145.5 \ \ ~ h_~ ~ - lJ \ - [l!_· - ~ ' "' I - ( \ 1245. 0 \ h 1\ -- -- 1------t- -- 1------_"\., - v:~ P OF ( ~NSBR 'A~ION ZONE [EL 1. 44.9] 1244.5 l-

AUG SEP OC~ NOV DEC JAN FIIIB MAR APR MAY JUN JUL 1993 1994 SAL'l' CR DJ~M 1:_0 PO.O.L ELEVA'l'IO.N 1254 -

1252

1250

1!1 L 1248 111 v

I N 1246 F '1' . -- - 1------~ M 1244 s 1\ L \

1242 i'l'O.P fF CO.llrS111R<1vii'A 'l'IO.N zo.. r• [1!1. 124 • 9] \ 1240 1'1J

1238 ' ' ' ' 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 CONESTOGA DAM AND LAKE SALT CREEK BASIN - NO. 12, NEBRASKA 1993-1994 REGULATION

The pool level remained in the flood control zone up to November. Precipitation and runoff was below normal. Heavy rainfall in June and July caused inflows of 25% and 26% of average, respectively.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 907 cfs Mar 24 87 185 cfs Mar 25 87 2nd 899 cfs Jul 24 93 180 cfs Jul 25 93 3rd 661 cfs Jun 27 83 152 cfs Jun 16 82

Pool-Date Highest 1241.1 Mar 24 87 2nd 1240.63 Jul 24 93 3rd 1239.6 Oct 11 73

Minimums of Record (since initial fill):

Pool-Date Lowest 1228.4 Aug 28 77 2nd 1229.12 Jun 30 92

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 4540, 77% of normal 4724, 93% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 80, Aug 29 102, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1235.12, Aug 01 1232.59, Nov 09

3.58 1242 SAL'l' CR DAM 12 ~OOL BLBVA'l'ION

1240

1238 l!l L E v 1236 I N - F 'l' 1234 I H s -f<' I~ L -r~ 1232 .I 1-.1 ~ V I' 1230 [.~L 12~2. 9] -

1228 I I I ' ' 1968 1970 1972 1974 1976 1978 1980 1982 1984 1986 1988 1990 1992 1994 1996 SAL2' CR DAM 1:1 POOL IfLifVA2'ION 1:135.5 - 2'0P 0 r l!'LOO p CON ROL Z N1f cll ir. 1:15• I - - - 1:135.0

If 1234.5 L Ifv

I N 1:134.0 1!' 2'

M .. s L 1:133.5 - I - 1\ ~ _r ~ ~J f\ A_ i 1:133.0 \ 1\ t"---J \ 1\ M _V_\ " - -- 1- -- r------,_- _\ -~~ p 01!' ' IfDIMif lr:r PO£ L ZON [IlL :13:1.9 f\+\ \) 1:13:1.5

AUG SBP OCT NOV DBC JAN l!'BB MAR APR MAY JUN JUL 1993 1994 TWIN LAKES DAM AND LAKE SALT CREEK BASIN - NO. 13, NEBRASKA 1993-1994 REGULATION

The pool level began the report period in the flood control zone. In November the pool level receded below the flood control zone and re-entered around the middle of the month. It stayed in the flood control zone until June when it declined below the flood control zone and remained throughout the period. Precipitation and runoff was below normal.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 632 cfs Jul 13 93 168 cfs Jun 30 83 2nd 539 cfs Mar 23 87 167 cfs Mar 24 87 3rd 507 cfs Jun 28 83 165 cfs Jul 27 93

Pool-Date Highest 1346.9 Jun 29 83 2nd 1346.0 Mar 23 87 3rd 1345.55 Jul 26 93

Minimums of Record (since initial fill):

Pool-Date Lowest 1332.130ct3191 2nd 1332.2 Aug 18 89

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 6216, 148% of normal 6180, 187% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 281, Aug 28 103, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1342.66, Aug 29 1340.58, Jul 31

3.61 SAL!!' CR DAM 13 POOL BLI!:VA!I'ION 1343.0 !I'OP 0 !' FLOO ~ CON~ ROL Z Nl!: Cll L 135~]

134:l.5

- 1!: L - 1!: v 134:l.O

I N - F !I' -

M 1341.5 s L - 1\v\ - ~ \ lr' ---- hf \_ h(\ 1341.0 n ' - P OF ONSI!:R VA!I'IO ZONI!: [ l!:L 1 ~41] - v!l' - N M 1340.5

AUG Sl!:P OC!I' NOV DBC JAN Fl!:B MAR APR MAY JUN JUL 1993 1994 SALT CR DAM 13 POOL ELEVATION 1348 TOP ( 1!' I!'L OD C NTRO ZOM [I!IL 1355

1346

1344 TOP 01!' co. SIIIRV. TION E L 1342 ZON ir CIIIL 1341 E v IJ -- - 1- ~~- .~ :- -- -- 11- ~~ ~.,- -- r- -- I \{ A N 1340 I \ \ F ~ T 1\ M "' 1338 \'II .,- s L - ~r ~ 1336

1334

'M v 1332 lf ' ' ' . . 1967 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 PAWNEE DAM AND LAKE SALT CREEK BASIN - NO. 14, NEBRASKA 1993-1994 REGULATION

The pool level remained in the flood control zone during the start of the report period. It declined below this level in the months of November and June. During each of those months the pool level later re-entered the flood control zone. Precipitation and runoff during the report period were below normal. Rainfall in June and July produced inflows of 33% and 58% of average, respectively.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Pool-Date Highest 1,381 cfs Mar 24 87 419 cfs Mar 25-26 87 1249.9 Jul 25 93 2nd 1,347 cfs Jul 13 93 420 cfs Jul 25 93 1248.4 Mar 24-25, 27 87 3rd 1,074 cfs Jul 19 85 311 cfs Jun 13 84 1247.1 Jun 12 84

Minimums of Record (since initial fill):

Pool-Date Lowest 1240.2 Oct 14 79 2nd 1241.2 Jan 01 77

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 9416, 114% of normal 8498, 153% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 814, Aug 29 201, Aug 30

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1246.30, Aug 29 1244.13, Nov 17

3.64 SALT CR DAM 14 POOL BLBVATION 1246.5 TOP 0 FLOO p CONl ROL Z NB [B 1:. 1263 • 5 J

1246.0

B L B v 1245.5

I N - F T

M 1245.0 s - L - - - [\ 1244.5 \ \ 1\ \ I~ \ ' '\ - IP~ ~ f--0 rJ~ - - - t- - -1------j- -- ~-\ ~ ~\ --- - TOP 0 SBDI iiBNT OOL Z NB [B ~ 1244 ~--3 - ~ 1244.0

AUG SBP OCT NOV DBC JAN FBB MAR APR MAY JUN JUL 1993 1994 ' 1250 SALT CR DAM 14 POOL ELEVATION TOP OF FLOC p CONTROL Z Nl!: [BL 1263.5] -

1248

1246

B L l.J B - - -- ~~- - v 1244 - ~- It ~} lr -\~Iff -~A - - . lr -~ I \j v "' r~ N It TOP OF Sl!:D MBNT F ) v T V' l PbOL ZONE [1!: 1244.31 v 1242 11 ' M s V' L

1240

1238 JJ ~I

I \r1

123 6 . ' ' ' ' ' ' ' ' ' ' 1966 1971 1976 1981 1986 1991 1996 ANTELOPE CREEK DAM AND HOLMES PARK LAKE SALT CREEK BASIN - NO. 17, NEBRASKA 1993-1994 REGULATION

The pool level stayed in the flood control zone during the beginning of the report period. In November, the pool level receded below the flood control zone. Minor fluctuations occurred in the pool level above and below the flood control zone up to April when the pool level re-entered the flood control zone and remained throughout the report period. Precipitation and runoff was below normal during the report period. Rainfall during June and July produced inflow of 422% and 217% of average, respectively.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 604 cfs Jul 24 93 187 cfs Jun 29 83 2nd 567 cfs Sep 08 89 174 cfs Jul 25 93 3rd 401 cfs Jun 27 83 140 cfs Sep 09 89

Pool-Date Highest 1249.97 Jul 24 93 2nd 1249.1 Sep 08 89 3rd 1248.1 Jun 27 83

Minimums of Record (since initial fill):

Pool-Date Lowest 1232.9 Aug 03 77 2nd 1236.8 Feb 26 76

Report Period: (August 1, 1993 through July 31, 1994) • Total Inflow (AF) Total Outflow (AF) 5188, 197% of normal 5020, 240% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 210, Jun 05 77, Jun 06

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1244.87, Jun 05 1241.86, Dec 07

3.67 1245.0 SAL~ CR DAN 17 POOL BLBVA~ION ~OP 0!1' FLOCD CON ROL .zpmr [B~ 126~]

1244.5 -

1244.0

B L B v 1243.5 I N

- 1243.0 - H s L \ :~ 1\\ 1242.5 --t---t------lJ "'- ---\N ~f-- -\ r - ( OF CONlbL ON .ZOt'JB [BJ 1242 4] 1242.0 v ~OP

- - 1241.5 -i-----f-----t-----t-----r-----r-----t-----+-----+-----+-----+-----+---~

AUG SBP OC~ NOV DBC JAN FJrB HAR APR HAY JUN JUL 1993 1994 SALT CR DAM 17 POOL ELEVATION 1252 TOP OF FLO D CONTROL ZONE (EL 126 ]

1250

1248

CON~ ERVATI ~E [EL 124 2. 41 1246 TOP OF 'N ZO E L E v 1244

I -- f- - -)'1\;jf ,.. - - - - lr- - \i ' . J"f'1 -- -- N 1242 - - ~ ~ '\ F - ~ \II I T hi I;( 1240 \ M s \ \ \ 1\ L \ 1238 f1 I~ - v J 1236

1234 \ ~ 1232 ' I I I I I I I I I I I I I ' 1966 1971 1976 1981 1986 1991 1996 BRANCHED OAK DAM AND LAKE SALT CREEK BASIN- NO. 18, NEBRASKA 1993-1994 REGULATION

The pool level remained in the flood control zone throughout the report period. Runoff and precipitation kept the pool level in the flood control zone during the report period. Heavy rainfall in June and July (5.93 and 6.10 inches) respectively, at the dam site produced inflows of 206% and 155% of average, respectively.

Maximums of Records:

Daily Inflow-Date Dally Outflow-Date Highest 3, 700 cfs Aug 25 87 774 cfs Jul 25 93 2nd 2,435 cfs Mar 23 87 730 cfs Aug 26 87 3rd 1,820 cfs Jul 23 93 670 cfs Jun 19 83

Pool-Date Highest 1287.9 Aug 26 87 2nd 1287.79 Jul 24 93 3rd 1287.7 Jun 18 83 Mar 23 87

Minimums of Record (since initial fill):

Pool-Date Lowest 1280.9 Jan 01 77 2nd 1281.5 Nov 25 89

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 47,731, 161% of normal 46,424, 202% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 1256, Jun 23 315, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1286.27, Jun 24 1284.15, Nov 15

3.70 SALT CR DAM 18 POOL ELEVATION 1290 !l'OP Cl!' FLO flD CO !n'ROL ZONB [BL 1 11] -

1288

1286

E w ·~ 1.1.11 L 1284 J IJI/ ~A,Lt~ l~ };, u E J \ v ~ H 1"' lfol !lJ !I' OJ 01!' CpNSBR A!l'IOl ZONB I v \/1 [BL N 1282 ~ 2841 A 1!' v !I' - I( ~ M s 1280 L

li 1278 f}v

1276

1:174 ' ' ' ' ' 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1:286.5 SALT CR DAM 18 POOL BLBVATION - TOP 0 po FLOO D CON~ ROL .Z( Nlf {II 131, I - - - 1:286.0 - - -

•L - •v 1:285.5 - I N - ,. - T -

M 1:285.0 s L -

- - (\ ~ \ 1:284.5 \ - ~ 1"0 \~ - ~. ~ - 0 - ~ 1:284.0 _!HU>_ _o ~ (.'0)11'< I.. RV.AT' tnor J:OJ r~ T II!L 12R

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. 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 1847.5 ft MSL would cover 19,095 acres and contains 346,419 AF of water.

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, if 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 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.

Maximums of Record: Minim urns of Records:

Pool Date Pool Date Highest 1848.61 Apr 26 76 Lowest 1843.39 Mar 13 85 2nd 1848.57 May 21 79 2nd 1843.50 Jan 27 92 3rd 1847.38 Jun 29 93

Report Period: (August 1, 1993 through July 31, 1994)

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1847.34, May 25 1844.44, Nov 23

3.73 LAKE AUDUBON POOL ELEVATION 1851 -

MAXIM M NOR !rAL OP!BRAT I• G POO [EL 850} 1850 - -

1849

E L - B TAR ET PC OL FO• FISH AND Ill LDLII v 1848 \E [PRE~ ENTLY BL 18 7.2} I N - - F j'\_- - t- -- t------+------T 1847 --- ~ --- '"'\._ M s ~ L 1846 1\ \ - 1845 ""' \ - '-_ - 1844

AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL 1993 1994 LAKB AUDUBON POOL BLBVA!I'ION 1851 -

MAXIMUM NORMAL OPERA Til tG POOL 'EL 185~ 1850

1849 - E L 1848 R E v TARGET POOL FO• FISH A ~D WILDL ~FE ~ \ [PRE~ BN!I'LY E I -1~-~ -tlii~~Wi- -~-- -1(1- - - LiAr\ - - N 184 7 ~ rt. [I, PI) ~ F \ !I' \ M lr 11 \ \ s 1846 '\ \ L \ - \, 1\ 1845 - rv \ I l.r fJ 1844 ~ ~ ~

1843

1986 1987 1988 1989 1990 1991 199:1 1993 1994 SPRING CREEK DAM AND LAKE POCASSE (LAKE OAHE SUBIMPOUNDMENT) MISSOURI RIVER BASIN, SOUTH DAKOTA 1993-1994 REGULATION

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 zone 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 by the Section to lower the pool to accommodate the appropriate runoff volumes.

Maximums of Record:

Pool-Date Highest 1625.00 Mar 23 87 2nd 1621.96 Jul 29 93 3rd 1621.20 Mar 19 78

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

Report Period: (August 1, 1993 through July 31, 1994)

Peak Pool Elevation (Ft- MSL) Minimum Pool Elevation (Ft. MSL) 1621.00, Aug 01 1613.43, Mar 14

3.76 LAKE POCASSE POOL ELEVATION 1621

T p 01!' DAM {! L 162 1

1620

1619 \ \ -V" ~ ~ I~ E L 1618 M E v I SPILLWJI Y CREI T. {JilL 16171 N 1617 1!' T -

M s 1616 L

1615 -

1614

1613 . AUQ SEP OCT NOV DEC JAN l!'EB MAR APR HAY JUN JUL 1993 1994 ! }

I LAKE POCASSE POOL ELEVATION '· 16:l5 TOP OF D< M [EL 16:l 1

SPILLWAY C REST [EL 161 7] I 16:l0 - I - I~ ------E r lj-~ ~ '+' ---- - 'v) j L tk tv K-- \1\ ~~ E 1.-1 " v 1615 ... - \ I ~ N

I' \ T

M 1610 s L -

1605 /1

·I - -

1600 ' ' ' ' ' ' ' ' 1964 1969 1974 1979 1984 1989 1994 1999 NON -CORPS PROJECTS

Regulated for flood control according to regalatioas Ia the Federal Register and supplemental agreements (Between the Bareau of Reclamation aad Corps of Engineers) Ia compliance with the 1944 Flood Control Act.

BOYSEN DAM CANYON FERRY DAM CLARK CANYON DAM GLENDO.DAM HEART BUTTE DAM JAMESTOWN DAM KEYHOLE DAM PACTOLA DAM SHADEHILL DAM TIBER DAM YELLOWTAIL DAM BOYSEN DAM AND LAKE BIGHORN RIVER BASIN, WYOMING 1993-1994 REGULATION

Boysen Reservoir is regulated by the Bureau of Reclamation (Regional Director) except when the pool level rises into the exclusive flood control zone as per the Field Working Agreement dated May 5, 1967. When this occurs release determination is the responsibility of the Corps of Engineers (District Engineer).

Below average snowfall and below average spring rainfall resulted in the pool level at Boysen making a steady decline throughout the report period.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 19,253 cfs Jun 23 67 14,204 cfs Jul 07 67 2nd 17,975 cfs Jun 17 63 10,688 cfs Jun 16 91 3rd 16,516 cfs Jun 15 91 8,518 cfs Jun 24 63

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

Minimums of Record (since initial fill):

Pool-Date Lowest 4684.18 Mar 18-19 56 2nd 4686.42 Sep 21 60

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 671 ,496, 66% of normal 825,734, 81 % of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 3734, May 14 5354, Mar 29

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 4723.81, Aug 15-16 4711.59, Jul 31

3.79 1.735

!l'OP I 1!' FLO D CON io.ROL !II PNB {J jr. 4 73 • :JO] -- 1- -- 1------r------4730

If L - !l'OP I 1!' JOI !1' USB !IIONB CBL 4~ 251 If v 4 7:J5 I - N """' 1!' ~ !1' -

II 47:JO ~ s ~ . L !l'OP 01!' CO! ~B.RVA~ ION !II ~ 4717 ------1------I~ " "~ 4715 f- / lr-~ - ~ 4710

AUQ SBP OC!l' NOV DBC JAN l!'BB IIA.R AP.R MAY JUN JUL 1993 1991. BOYSEN DAM POOL ELEVATION 4 740

TOP Ol' FLOOD CO N!I'ROL ~ONE [El 47~2.2 I ------1- - 4730 - TOP OF J'OIN!I' USE ZONE j!"L 4 725 - . ~ -~- r --,... ------

E 4 720 L - E ------...,- r- - - - v - I 1/f\ f N 4HO ~ F !I'

M s 1~11 L 4700

OP OF CONSERVA ION ZON~ [EL 4' 17] -

4690

- - -

4680 I I I I I I I I I I I I I I I I I I I I 1953 1958 1963 1968 1973 1978 1983 1988 1993 1998 CANYON FERRY DAM AND RESERVOIR MISSOURI RIVER BASIN, MONTANA 1993-1994 REGULATION

Canyon Ferry Reservoir is regulated by the Bureau (Regional Director) 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 May 23, 1977. When this occurs, release determination is the responsibility of the Corps (District Engineer).

Dry conditions resulted in no encroachment into the flood control zone.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 29,050 cfs May 24 81 25,720 cfs Jun 13 81 2nd 27,570 cfs Jun 19 74 24,370 cfs Jun 19 64 3rd 27,110 cfs May 30 56 24,030 cfs May 31 56

Pool-Date ·Highest 3800.00 55, 56, 62 2nd 3799.93 Jul 07-12 75 3rd 3799.66 Jun 04-5 62

Minimums of Record (since initial fill):

Pool-Date Lowest 3764.70 Apr 11 67 2nd 3772.75 Mar 25 62

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 3,250,721, 93% of normal 3,495,479, 99% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 9426, Apr 26 10,050, Aug 03

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 3797.52, Aug 01 3781.82, Apr 03

3.82 .

TOP 4 If' lf'LO D CONtr'.ROL l ONB [. L 380 ]

- TOP pr JOlJNT USJ ZONB [ BL 3 9 7] --1---1------1f -1~- +---!------L - 1f ~ v 3795 -1-----+--~~----4-----+-----~---4----4-----+-----+---~-----+----- ~__,...... -+--\ r N . [\ /~ "s L

- 3785 1\ - BASlf Olf' .RJPLAClf lfN'l' . --1---1-----

3780

AUQ SBP OCT NOV DlfC JAN IrlfB MA.R AP.R MAY JUN JUL 1993 1994 CANYON FERRY DAM POOL ELEVATION 3805 - TOP or ~LOOD CG NTROL Ill NIII (JilL 13 80 0} TOI or J OI T USE Ill Nlf (JilL 3797} 3800 - -~ -- r ------3795

- ' 3790 - Ill - L ~. II Illv 3785 = - r- f- - - - - 1- ~ - -- - ~ - - I - N 3780 ~w ,. - T

M 3775 s - L BASB OF RlfPLACBftBN!I' ZOzpr (BL 3 83} 3770 - - 3765 - - 3760 - - - - 3755 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' 1954 1959 1964 1969 1974 1979 1984 1989 1994 1999 CLARK CANYON DAM AND RESERVOIR BEAVERHEAD RIVER BASIN, MONTANA 1993-1994 REGULATION

Clark Canyon Reservoir (Hap Hawkins Lake) is regulated by the Bureau (Regional Director) 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 (District Engineer).

Clark Canyon briefly entered the flood control zone from April 21 to May 12. But since the irrigation season was imminent, no flood control releases were prescribed.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 3,416 cfs Jun 22 84 2,561 cfs Jun 25 84 2nd 2,800 cfs Jun 20 75 1,289 cfs Jul 31 75 3rd 2,208 cfs Mar 31 69 1,275 cfs Aug 12-24 75

Pool-Date Highest 5564.70 Jun 25 84 2nd 5556.88 Jul 22 75 3rd 5554.54 Jun 25 76

Minimums of Record (since initial fill):

Pool-Date Lowest 5508.67 Aug 23-25 89 2nd 5509.83 Sep 24 92

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 207,184, 77% of normal 207,190, 79% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 704, Aug 22 961, Jul 23

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 5546.66, May 02 5523.11, Sep 26

3.85 5565 CLARK CANYON DAM POOL ELEVATION - - - TOP PF 1!'LOPD CO! TROL ONE c L 556 ll.4J 5560 - 1- -- 1------f------., - - 5555

- E - L 5550 E v - TOP ( 1!' JOI T USE ZONE [EL 5! 46.1] I -- t- -- 1------N 5545 --- 1-?""' ~- - --- 1!' - \ T v v M J_---- s 5540 1\ L - v TOP 1 1!' CON 5-ERVAT NE [E, 5535 7] \ 5535 1- -- 1- -- ~ ------~ ------I" - - - v h 5530 v "-../ \ \

5525

AUG SEP OCT NOV DEC JAN 1!'EB MAR APR MAY JUN JUL 1993 1994 CLARK CANYON DAM POOL ELEVATION 5570

TOP OF FLO OD CONTROL ONE {EL 556 0.4] 5560 ------TOP OF JOIN USE ZONE 5550 - {EL ~ 5 4 6. 1] E ------~ - --- - L - -~ -II;- E h/ lr' v 5540 v r11\~ ~j \ II' l.r-J\'V { II I ll ' J_ N - ~ ------1------r- -·- F - !I' 5530 m"D ""' ~" I~D,RmT"" M ZONE {EL 5535. 7] IY s - L

55:JO

5510

5500 ' ' ' ' ' ' ' ' ' ' 1965 1970 1975 1980 1985 1990 1995 GLENDO DAM AND RESERVOIR NORTH PLATIE RIVER BASIN, WYOMING 1993-1994 REGULATION

Glendo Reservoir is regulated by the Bureau of Reclamation (Regional Director) except when the pool level rises into the exclusive flood control zone. When this occurs, release determination is the responsibility of the Corps (District Engineer) as per the Field Working Agreement dated May 12, 1977. The Bureau imposed an elevation restriction of 4650 ft. MSL in December of 1983 due to increased dike seepage. The final inspection was conducted on October 17, 1989. On February 16, 1990, the Bureau of Reclamation's Regional Office in Billings, Montana, officially rescinded Glendo Reservoir's operating restriction. The top of flood control pool is again at elevation 4653.

Glendo Reservoir pool did not enter the exclusive flood control zone during the report period.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 18,840 cfs May 15 65 10,292 cfs Jun 30 84 2nd 17,560 cfs Jun 13 70 10, 266 cfs Jul 01 84 3rd 14,661 cfs May 21 73 10,060 cfs Aug 26 83

Pool-Date Highest 4650.90 May 27 73 2nd 4650.27 Jun 14 83 3rd 4648.45 May 31 71

Minimums of Record (since initial fill):

Pool-Date Lowest 4548. 10 Sep 28 66 2nd 4560.42 Sep 26 72

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 939,252, 79% of normal 598,458, 52% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 4488, Jul 26 7540, Jul 26

3.88

~--~--~-~- -~~~------.-.------Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 4646.54, Apr 30 4583.66, Sep 23, 24

3.89 GLENDO DAM POOL ELEVATION 4660

TOP pF l!'LC OD CO• TROL ONE [.L 465 ~] -- t- -- t------4650

4640

TOP ~1!' CC?! SERVA ION z NJ: [E f'_ 4 635 1 -- t- -- r------1- -- -- 1------E L 4630 E v I N / v /\ 4620 ~ 1!' v \ T v M / s 4610 1\ I\ L v / 4600 \ L_ \ - v 4590 1\ / - ~ / 4580

AUG SEP OCT NOV DEC JAN l!'EB MAR APR MAY JUN JUL 1993 1994 GLENDO DAM POOL ELEVATION 4660 :!OJ' _9F_ir_f.0_9D_ qgJfTR_9L_ Z_9J'!lf J E_J. .J 6J 3J _ - -1-- - -· ----- 'l!OP OF CONSER VA ION ZONE [EL 635] 4 640 _,__ - - -· - -!-- - t------

E 4620 L E v -

I N 4 600 F '1!

M s L 4580

4560

4540 ' ' ' ' T I ' ' 1958 1963 1968 1973 1978 1983 1988 1993 1998 HEART BUTTE DAM AND RESERVOIR (LAKE TSCHIDA) HEART RIVER BASIN, NORTH DAKOTA 1993-1994 REGULATION

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

The pool remained slightly in the flood control zone from mid-March to July. Regulation was accomplished by the uncontrolled outlet works.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 22,450 cfs May 09 70 4,050 cfs Apr 09 52 2nd 22,000 cfs Apr 17 50 3,931 cfs May 31 78 3rd 12,960 cfs Apr 06 52 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

Minimums of Record (since initial fill):

Pool-Date Lowest 2049.00 Oct 28 91 2nd 2051.44 Nov 07 90 3rd 2052.80 Dec 31 61

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 53,399, 62% of normal 44,916, 54% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 1511, Jun 14 740, Jun 15

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 2066.61, Jun 15 2063.28, Mar 05

3.92 HEART BUTTB DAM POOL BLBVATION 2095 - - - t- ~ 1- TOP OF P'L OD co ~TROL ZONB [ !B'L 20, 4. 5] -

2090

- 2085

B L B - v 2080 I N - - F T 2075 M s L

2070

_C_ r- 2065 1--- L ------t- - - ~--- =----::::. - p TOP OF co ~SBRVJ TION ONB [ L 206 • 5]

2060

AUG SBP OCT NOV DBC JAN FBB MAR APR MAY JUN JUL 1993 1994 HKAR!I' BU!I'!I'E DAM POOL ELEVATION 2095 ------!I'OP OF P'LOOD CCN!I'ROL Z NE [EL ~094. 5] 2090 .

2085 .

2080 E L E 2075 v . TOP OF CONSERiVATION ONE] I N 2070 I' : !I' - 2065 a M - t- - - t- - t- - s - 1'1'1 L - v 2060 l \1 IAf I J - ~ I\ y !,1 - - "' .. 2055 .J\1 : \1 '., - 2050 11 - v

2045 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' 1951 1956 1961 1966 1971 1976 1981 1986 1991 1996 JAMESTOWN DAM AND RESERVOIR JAMES RIVER BASIN, NORTH DAKOTA 1993-1994 REGULATION

Jamestown Reservoir is regulated by the Bureau of Reclamation (Regional Director) 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, as per the Field Working Agreement dated July 15, 1975. When this occurs, release determination is the responsibility of the Corps of Engineers (District Engineer).

As a result of the heavy rainfall in July 1993, record high pool levels, record inflow volume and record outflow volume were set for the months from August 1993 to February 1994. Inflow for this period was the highest since 1954 and was 30 times the normal.

Spring runoff resulted in the pool climbing into the flood control zone and eventually exceeding 1440.0 ft, MSL. This required a release of 700 cfs for a short duration until the pool dropped below this level.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 7,220 cfs Apr 18 69 718 cfs Aug 23 93 2nd 3,719 cfs Aug 03 93 712 cfs Apr 13-15 94 3rd 3,300 cfs Apr 04 87 489 cfs Apr 16 83

Pool-Date Highest 1444. 10 Apr 27 69 2nd 1442.83 Aug 15 93 3rd 1442.04 Apr 16 87

Minimums of Record (since initial fill):

Pool-Date Lowest 1420.91 Feb 27 93 2nd 1421.85 Jul 31 92 3rd 1423.53 Jul 31 91 4th 1425.58 Jul 31 90

3.95 Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 177,421, 600% of normal 183,060, 860% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 3719, Aug 03 718, Aug 23

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 1442.83, Aug 15 1429.75, Nov 15

3.96 JAMES2'0WN DAM POOL ELEVA2'ION 1455 1- -- 1------r------. ------2'0P PF FLC OD COl 2'.ROL ONE [~L 145 1

1450 -

E 1445 L E v

I 0- N 1440 ~ r--.. .,. - I 2' - \ " M - s 2'0P 0 F JOIN ~ USE L 1435 1\ \ ZONE [EL 1< 32. 71 I~ -- t------~ - t---\ -/

\ /' ~ 1430 ------2'0P 'I' COli SE.RVA ION Z NE [E ~ 1429 ~ •• 81

1425

AUG SEP OC2' NOV DEC JAN FEB MAR AP.R MAY JUN JUL 1993 1994 1, I 'j I JAIIliS!I'OWN DAN POOL liLliVA!I'ION 1455 - . I· ------... ------r------!I'OP or II' LOOD CON!l ROL ZONll [IlL 1454] - 1450 - - - i 1445 - II - 1440 ll !I'OP or J IN!I' USll L ll ZONll [IlL 1432.7] v 1435 : ------,• - - - -- I - ~ -~- N rill \ (\ 1\ 1430 ... ~An '~ ~y F 1.. "<;: - !I' 011' ~ONSliRVA2 14 29 8] '-'\ \ !I'OP ION ZONll [IlL 1\ II 1425 ~ s \ L ~ 1420 N

- 1415 \/

1410

- 1405 I I I I I I I I I I I I I I I I I I I ' ' 1955 1960 1965 1970 1975 1980 1985 1990 1995 KEYHOLE DAM AND RESERVOIR BELLE FOURCHE RIVER BASIN, WYOMING 1993-1994 REGULATION

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

Despite high inflow (289% of normal), the pool did not reach the flood control zone during the report period.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 10,720 cfs May 19 78 1,34 7 cfs May 24 78 2nd 4, 780 cfs Feb 29 72 820 cfs May 23-24 62 3rd 3,530 cfs Jun 18 62 801 cfsMar11-1572

Pool-Date Highest 4100.38 May 07 78 2nd 4098.78 Mar 07 72 3rd 4096.41 May 06 73

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 4th 4070.73 Sep 18 89

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 50,754, 289% of normal 13,109, 87% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 1779, Mar 04 109, Jul 01-05

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 4087.60, May 16 4079.50, Nov 24

3.99 KEYHOLE DAN POOL ELEVA:l'ION 4115

- :l'OP pF FLC OD CO• :l'ROL irONE fjrL 411 1.5] -- 1- -- 1------r- -- 1------4110 - - - - 4105 -

1!1 :l'OP F COli ~ERVA~ IOON ONE [ 099.3 L 4100 1!1 -- t- - r------r------v - I N 4095 - F :r

M s 4090 L - - 4085 / r---- ~ 4080 r - -

4075

AUG SEP OC:l' NOV DEC JAN FEB MAR APR MAY JUN JUL 1993 1994 KEYHOLB DAM POOL BLEVATION 4l20

--- :o.! ~F- LOOD CO ~_:R~L- Z~ NE [EL lll.S] 4ll0 ------

TOP ar ll"f'••~·D" l'I"Inl\7 zc .1 I 4l00 --- - INB [409: ------B J L fv..A rl A ~ 4 090 IV ~ B <.J \Jvu l v - '-1 fl I I~ A~ N 4080 ~ F ~ru v\r' T vv M s 4070 L '"''--1

4 060 - l.j ~ 4050 \ ~~ \ -

4040 ' ' ' ' ' ' ' ' ' l953 l958 l963 l968 l973 l978 l983 l988 l993 l998 PACTOLA DAM AND RESERVOIR RAPID CREEK BASIN, SOUTH DAKOTA 1993-1994 REGULATION

The pool rose to the base of the flood control zone twice during the report period. Releases were made as high as 180 cfs to prevent encroachment.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 1, 11 0 cfs May 16 65 500 cfs May 20 65 2nd 541 cfs Jun 08 93 350 cfs May 22 78 3rd 485 cfs Jun 07 91 325 cfs Jun 24 93

Pool-Date Highest 4585.87 May 19 65 2nd 4585.44 May 21 78 3rd 4585.06 Jan 22 72

Minimums of Record (since initial fill):

Pool-Date Lowest 4531.53 Jan 24 91 2nd 4533.12 Feb 21 90

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 39,806, 132% of normal 40,866, 142% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 203, May 06 180, Apr 27

Peak Pool Elevation (Ft MSL) Minimum Pool Elevation (Ft. MSL) 4580.20, Jun 06 4575.99, Jul 31

3.102 PACTOLA DAM POOL ELEVATION 4625 = 'l'OP 01!' 1!'L OD co 'l'ROL ZONE Cia'L 46• 1. 51 - -- -- 1------~ - - f- -- 1------4 620 -

4615 - - 4610 - E - L E v 4605 I N 4600 1!' T M 4595 s L = 4590 = 4585

= TOP 01!' C< NSERV• 'I' ION ZONE [~L 456 0.2] - 4580 - -- -1~ ------/ - ~ 4575 AUG SEP OCT NOV DEC JAN FEB MAR APR MAY JUN JUL 1993 1994 PACTOLA DAM POOL 111L111VATION 4640

TOP OF LOOD CON m-ROL ZON {111L 462 • 5] 4620 ------

4600 - TOP OF CjoNS111rVA ~ ON ZON111~ lr 111L 4580. 2] 4580 ·y 111 .. '>r-'\JV\r'\ -lr' "'' . "''ll L fV r;f\ vyv\ 1"'\ 111 - v \,._ \) M 4560 I \,) N -

.,. ~ T 4540 ll\_ M s .,i L 4520 J \.-' I - I 4500 .! 4480 v -

4460 ' ' ' ' ' ' ' ' ' ' ' 1958 1963 1968 1973 1978 1983 1988 1993 1998 SHADEHILL DAM AND RESERVOIR GRAND RIVER BASIN, SOUTH DAKOTA 1993-1994 REGULATION

Shadehill Reservoir is regulated by the Bureau of Reclamation (Regional Director) except when the pool level rises into the exclusive flood control zone as per the Field Working Agreement dated May 15, 1972. When this occurs, release determination is the responsibility of the Corps of Engineers (District Engineer).

The pool remained in the flood control zone from mid-March until the end of July. The uncontrolled outlet works regulated the pool level during this period.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 32, 152 cfs Apr 08 52 5,078 cfs Apr 10 52 2nd 9,900 cfs Mar 29 78 4,190 cfs Apr 01 78 3rd 6, 730 cfs Mar 13 72 3,020 cfs Mar 16 72

Pool-Date Highest 2297.90 Apr 10 52 2nd 2282.42 Apr 01 78

Minimums of Record (since initial fill):

Pool-Date Lowest 2258.62 Nov 17 81 2nd 2259.11 Feb 28 62

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 139,141, 250% of normal 139,962, 245% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 1800, Mar 08 1475, Aug 01

Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 227 4.35, Aug 01 2268.23, Mar 01-03

3.105 :1305 - - TOP 01!' ,, OOD c NTROL ZONB [BL ~ ~0:1] -- t--- t------t------:1300 - -

2:195

11 L :l :19 0 11 v I N 2:185 1!' T - . M s :1:180 L

:1:175 TOP 0• CONS RVATI pN zo~ 11 [BL :1271. T:~~ r------9r - ~ V=-= :1:170 - - I - - :1:165

AUG SliP OCT NOV DBC JAN l!'BB MAR APR MAY JUN JUL 1993 1994 SHADEHILL DAM POOL ELEVATION 2305 - -- - - 2300 -

- 2295

= 2290

I& - L I& v 2285

I N 2280 = F - T TOP OF CONSE'RVillTIDN ZtN!< {JL 271 91 M s L - f- - - -~- 2270 !\ \

2265 - - 2260 \i

2255 ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' ' 1953 1958 1963 1968 1973 1978 1983 1988 1993 1998 TIBER DAM AND RESERVOIR (LAKE ELWELL) MARIAS RIVER BASIN, MONTANA 1993-1994 REGULATION

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 (District Engineer). when replacement storage is required for the downstream Fort Peck Reservoir, releases from Tiber Dam will be adjusted beginning March 1, based on anticipated inflow, to fill the reservoir to elevation 3008.1 ft. MSL prior to mid-July. Minimum releases to achieve this fill are 300 cfs.

No water was stored fro the purpose of flood control during the report period.

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 102,888 cfs Jun 10 64 10,300 cfs Jun 13-14 64 2nd 53,053 cfs Jun 21 75 5, 777 cfs Jun 25 75 Jul 11 75 3rd 25,200 cfs Feb 26 86 5,308 cfs Jun 22-24 67

Pool-Date Highest 3005.59 Jul 12 65 2nd 3001.91 Jun 13 64 3rd 2995.53 Jul 03 91

Minimums of Record (since initial fill):

Pool-Date Lowest 2953.81 Mar 28 68 2nd 2955.31 Apr 27 67

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 661,595, 106% of normal 641,908, 107% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 5402, Mar 04 2425, May 31

3.108 Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 2991.84, Jun 01 2979.71, Mar 01

3.109 3020 : 3015 : !I'OY 'J'""'J'.C"' 7D""t:'C1N II'XOL"'l omrn r:;" 31) r: :-sr -- r-- r------3010

3005 - : 3000 : - 2995 1!1 ------r------L 2990 E v - ~ 2985 v I ------/ N - !' 2980 F 1- -- !I' 2975 -- r------r------: !1'01' F JOI J!l' USB ZONI!I {l!IL 29 93] M s 2970 L 2965 - 2960 - 2955

2950

2945 ~·vy .

AUQ Sl!IP OC!I' NOV Dl!IC JAN Fl!IB MAR APR MAY JUN JUL 1993 1994 TIBER DAM POOL ELEVATION 3020

3015 ------':::"-"':::"~ :_"'':. ~ v~ :_" ~ ------" ------3010

3005

3000 ~=r------r-----r~------4------r------+------r------+------~: 2995 TOP OF J INT USB ZONB [BL 9931 B : ------· ----r------L 2990 E v 2985 ,, I - 'I N 2980 II F 1\_'IJ. - T 2975 " ------f- -~I~- II M M TOP OJ CONSBRV TION s 2970 -=~-r---+-+------~-H--+rBr~+;-*-HH+--~~~r+-----4~~~--4-~~---4 L Z NB [BL 2976] 2965 - v 2960 \ = ~ 2955 ~-f+------+------r-~~---r------4~------4------+------+------4

2950

2945 ---H------r+------r------r------~~------4------+------+------~

2940 ' ' ' ' ' ' ' ' ' 1956 1961 1966 1971 1976 l98l 1986 1991 l996 YELLOWTAIL DAM AND LAKE (BIG HORN LAKE) BIG HORN RIVER BASIN, MONTANA 1993-1994 REGULATION

Yellowtail Reservoir is regulated by the Bureau of Reclamation (Regional Director) except when the pool level rises into the exclusive flood control zone (3640 ft. above MSL) or that portion of the joint use zone required for flood control as per Field Working Agreement Dated March 5, 1971. When this occurs, release determination is the responsibility of the Corps of Engineers (District Engineer).

Below average snowfall and below average spring rainfall resulted in the pool level at Bighorn Lake making a steady decline throughout the report period.

The pool encroached into the flood control pool for 1 day in October (3640.07 ft above MSL).

Maximums of Records:

Daily Inflow-Date Daily Outflow-Date Highest 29,775 cfs Jul 01 67 24,721 cfs Jul 08 67 2nd 19,005 cfs Jun 10 81 14,947 cfs Jul 03 70 3rd 18,607 cfs Jun 26 69 12,638 cfs Jun 12 91

Pool-Date Highest 3656.36 Jul 06 67 2nd 3648.55 Jul 13 78 3rd 3647.11 Jun 26 91

Minimums of Record (since initial fill):

Pool-Date Lowest 3583.30 Apr 14 89 2nd 3584.45 Mar 11 70

Report Period: (August 1, 1993 through July 31, 1994)

Total Inflow (AF) Total Outflow (AF) 1,823,590, 74% of normal 2,062,511, 86% of normal

Peak Daily Inflow (CFS) Peak Daily Outflow (CFS) 8,256, Oct 08 5,455, Nov 02

3.112 Peak Pool Elevation (Ft. MSL) Minimum Pool Elevation (Ft. MSL) 3640.07, Oct 12 3606.93, Mar 28

3.113 ' ! YBLLOWTAIL DAM POOL BLEVATION 3660 ------r------r------TOP 01!' I!'LC OD CO TJ!OL ~ONB {IIIL 36~ 7]

3650 - - TOP 01!' JO NT US ZONE {BL 3 640]

. E 3640 -T L -1~ ../"f-J'\ E - r' ' v ,_..' - ., I - ' N 3630 I~ ~if" \ 1!' T . Ll M - ~' s ~ L ~' 3620 L' TOP PI!' COl SBJ!VA ION Z N1!l ;~;- - '~-' ""' ,,.,., - {BL ' 614] >..;. ~ lf_ I~ -~-:-- -- 1- -- r------~ -[i- --- - ' j_ ~- 3610 " ' ~ - ~ - - 3600

AUG SBP OCT NOV DEC JAN I!'BB MAR APR MAY JUN JUL 1993 1994 YELLOWTAIL DAM POOL ELEVATION 3670

3660 ~0~ Q!' J' f_og_p _CQ_N~RQ!. _ZQ...Nl!.. LE~ :t. FL ------

3650 TOP OF oJ)INr USE ZONE EL 640]

3640 -- --·· ---r-- --1------~--·· E L E v 3630

I N 3620 F T - 1------1- - r - - r 1------M 3610 s L 3600

- TOP OF CONSERVAT ON ZONE 361~ I 3590 [EL

3580

3570 ' ' ' ' ' ' 1965 1970 1975 1980 1985 1990 1995