Effect of Daily Fluctuations from Flaming Gorge Dam on Ice Processes in the Green River

Total Page:16

File Type:pdf, Size:1020Kb

Effect of Daily Fluctuations from Flaming Gorge Dam on Ice Processes in the Green River Utah State University DigitalCommons@USU U.S. Government Documents (Utah Regional Elusive Documents Depository) 2000 Effect of Daily Fluctuations from Flaming Gorge Dam on Ice Processes in the Green River John W. Hayse Steven F. Daly Andrew Tuthill Richard A. Valdez Bryan Cowdell Gary Burton Follow this and additional works at: https://digitalcommons.usu.edu/elusive_docs Part of the Environmental Sciences Commons Recommended Citation Hayse, John W.; Daly, Steven F.; Tuthill, Andrew; Valdez, Richard A.; Cowdell, Bryan; and Burton, Gary, "Effect of Daily Fluctuations from Flaming Gorge Dam on Ice Processes in the Green River" (2000). Elusive Documents. Paper 67. https://digitalcommons.usu.edu/elusive_docs/67 This Book is brought to you for free and open access by the U.S. Government Documents (Utah Regional Depository) at DigitalCommons@USU. It has been accepted for inclusion in Elusive Documents by an authorized administrator of DigitalCommons@USU. For more information, please contact [email protected]. AAIL IEI/itf ... IOlo£( I JUL 0 7 ZODO 0811 Effect of Daily Fluctuations from Flaming Gorge Dam on Ice Processes in the Green River John W. Hayse Steven F. Daly Andrew Tuthill Richard A. Valdez Bryan Cowdell Gary Burton Upper Colorado River Endangered Fish Recovery Program Project #83 Final Report May 2000 Argonne National Laboratory, with facilities in the states of Illinois and Idaho, is owned by the United States government, and operated by The University of Chicago lUlder the provisions of a contract with the Department of Energy. _------ DISCLAIMER --------. This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor The University of Chicago, nor any of their employees or officers, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof The views and opinions of document authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof, Argonne National Laboratory, or The University of Chicago. Available electronically at http://www.doe.govlhridge Available for a processing fee to U.S. Department of Energy and its contractors, in paper, from: U.S. Department of Energy Office of Scientific and Technical Information P.O. Box 62 Oak Ridge, 1N 37831-0062 phone: (865) 576-8401 fax: (865) 576-5728 e-mail: [email protected] Argonne National Laboratory Report No. ANL/EA/RP-I02041 EFFECT OF DAILY FLUCTUATIONS FROM FLAMING GORGE DAM ON ICE PROCESSES IN THE GREEN RIVER Upper Colorado River Recovery Program Project No. 83 Final Report l John W. Hayse , Steven F. Daly2, Andrew TuthilF, 3 3 Richard A. Valdez ,4, Bryan Cowde11 , and Gary BurtonS 1Argonne National Laboratory Environmental Assessment Division 9700 South Cass Avenue Argonne, Illinois 60439 2U.S. Army Corps of Engineers Research and Development Center Cold Regions Research and Engineering Laboratory 72 Lyme Road Hanover, New Hampshire 03755 3BIO/WEST, Inc. 1063 West 1400 North Logan, Utah 84321 eCurrent address: SWCA, Inc.; 56 West 400 South; Suite 201; Salt Lake City, Utah 84101) 5Western Area Power Administration P.O. Box 3402 Golden, Colorado 80401 May 2000 ACKNOWLEDGMENTS This report was funded, in part~ by the Recovery Implementation Program for the Endangered Fish Species in the Upper Colorado River Basin (Recovery Program). The Recovery Program is a joint effort ofthe U.S. Fish and Wildlife Service, U.S. Bureau of Reclamation, Western Area Power Administration, the states of Colorado, Utah, and Wyoming, Upper Basin water users, environmental organizations, and the Colorado River Energy Distributors Association. This project was completed through a cooperative effort among researchers from Argonne National Laboratory, the U.S. Army Cold Regions Research and Engineering Laboratory, BIO/WEST, and Western Area Power Administration. We thank Steve Petersburg of the National Park Service, Dinosaur National Monument for granting a scientific research permit and Steven Brock and Daniel Schaad of the Ouray National Wildlife Refuge for their cooperation with providing the appropriate permits and access to roads and other areas at the refuge. In addition, the authors thank Tom Ryan of the U.S. Bureau of Reclamation for providing timely output from hydrological modeling that allowed us to coordinate field work at downstream locations with water releases from Flaming Gorge Dam. -11- DISCLAIMER Portions of this document may be illegible in electronic image products. Imagesare produced from the best available original document. TABLE OF CONTENTS ACKNOWLEDGMENTS ................................................ ii LIST OF TABLES ....................................................... v LIST OF FIGURES ..................................................... vi LIST OF KEY WORDS ................................................. ix EXECUTIVE SUMMARY ... .. x 1 INTRODUCTION ..................................................... 1 1.1 RIVER ICE FORMATION ...................................... 2 2 METHODS .......................................................... 6 2.1 THE STUDY REACH .......................................... 6 2.2 HISTORICAL CONDITIONS AND OBSERVATIONS ............... 6 2.2.1 Flow Rates ............................................ 6 2.2.2 Water and Air Temperature Measurements ................... 7 2.2.3 Historical Ice Observations ............................... 7 2.3 19961997 FIELD MEASUREMENTS .............................. 8 2.4 ICE PROCESS MODELING ..................................... 9 2.4.1 Unsteady Flow Sub-Model .................... " ........ 10 2.4.1.1 Channel Geometry Data .......................... 11 2.4.1.2 Calibration ofUNET Unsteady Flow Model ......... 11 2.4.2 Transport Sub-Model ................................... 13 2.4.3 Ice Cover Progression Sub-Model ......................... 13 3 RESULTS .......................................................... 14 3.1 HISTORICAL CONDITIONS AND OBSERVATIONS .............. 14 3.1.1 Winter Flows ......................................... 14 3.1.2 Water and Air Temperatures ............................. 15 3.1.3 Ice Formation on the Green River ......................... 16 3.1.3.1 USGS Observations ............................ 16 3.1.3.2 BIO/WEST Reports ............................ 16 -111- 3.1.3.3 Winter of 1996-97 Field Survey .................. 17 3.2 1996-1997 FIELD MEASUREMENTS ............................ 19 3.3 MODELING RESULTS ........................................ 20 3.4 RIVER HYDRAULIC CONDITIONS: COMPARISON OF STEADY AND UNSTEADY FLOWS .......................... 20 4 DISCUSSION ....................................................... 22 5 RECOMMENDATIONS ............................................... 27 6 REFERENCES ...................................................... 28 TABLES .............................................................. 30 FIGURES ............................................................. 45 APPENDIX ........................................................... 91 -lV- LIST OF TABLES Table 1. Calibration data used in the unsteady flow UNET model ................ 31 Table 2. Maximum accumulated freezing degrees days (AFDD) for water years 1950 to 1997 .................................................... 34 Table 3. Field survey observations of ice conditions on 18-19 December 1996 ...... 36 Table 4. Ice thickness measurements before and after initiation of peaking flows .... 37 Table 5. Results of two-way analysis of variance (ANOVA) to evaluate the effects of cross section location (river mile, RM) and fluctuation regime (steady flow vs. fluctuating flow) on ice cover thickness ................... 38 Table 6. Stage, velocity, depth and Froude number for a steady flow of 2400 cfs ..... 39 Table 7. Stage, velocity, depth, and Froude number at first peak following the steady flow period ................................................ 40 Table 8. Stage, velocity, depth, and Froude number at first trough following initial peak ...................................................... 41 Table 9. Stage, velocity, depth and Froude number at lowest trough ............... 42 Table 10. Stage, velocity, depth and Froude number at highest peak ............... 43 Table 11. Maximum AFDD, mean daily winter flow, maximum reported upstream ice cover extent, and the daily release schedule during ice observations in the study area ....................................... 44 -v- LIST OF FIGURES Figure 1. Map of the Green River basin ..................................... 46 Figure 2. Map of the study area in the Green River ............................ 47 Figure 3. Locations of cross sections for stage change and ice thickness measurements .................................................... 48 Figure 4. Stage-discharge curve for the Jensen, Utah gage ....................... 49 Figure 5. Stage-discharge curve for the Ouray, Utah bridge ...................... 50 Figure 6. Graphical representation of cross section locations and types ............ 51 Figure 7. Measured
Recommended publications
  • Operation of Flaming Gorge Dam Final Environmental Impact Statement
    Record of Decision Operation of Flaming Gorge Dam Final Environmental Impact Statement I. Summary of Action and Background The Bureau of Reclamation (Reclamation) has completed a final environmental impact statement (EIS) on the operation of Flaming Gorge Dam. The EIS describes the potential effects of modifying the operation of Flaming Gorge Dam to assist in the recovery of four endangered fish, and their critical habitat, downstream from the dam. The four endangered fish species are Colorado pikeminnow (Ptychocheilus lucius), humpback chub (Gila cypha), razorback sucker (Xyrauchen texanus), and bonytail (Gila elegans). Reclamation would implement the proposed action by modifying the operations of Flaming Gorge Dam, to the extent possible, to achieve the flows and temperatures recommended by participants of the Upper Colorado River Endangered Fish Recovery Program (Recovery Program). Reclamation’s goal is to implement the proposed action and, at the same time, maintain and continue all authorized purposes of the Colorado River Storage Project. The purpose of the proposed action is to operate Flaming Gorge Dam to protect and assist in recovery of the populations and designated critical habitat of the four endangered fishes, while maintaining all authorized purposes of the Flaming Gorge Unit of the Colorado River Storage Project (CRSP), including those related to the development of water resources in accordance with the Colorado River Compact. As the Federal agency responsible for the operation of Flaming Gorge Dam, Reclamation was the lead agency in preparing the EIS. Eight cooperating agencies also participated in preparing this EIS: the Bureau of Indian Affairs (BIA), Bureau of Land Management, National Park Service, State of Utah Department of Natural Resources, U.S.
    [Show full text]
  • Big-River Monitoring on the Colorado Plateau
    I NVENTORY & M ONITORING N ETWORK Big-River Monitoring on the Colorado Plateau Dustin Perkins1, Mike Scott2, Greg Auble2, Mark Wondzell3, Chris Holmquist-Johnson2, Eric Wahlig2, Helen Thomas1, and Aneth Wight1; 1Northern Colorado Plateau Network, P.O. Box 848, Bldg. 11, Arches National Park, Moab, UT 84532 2U.S. Geological Survey, Biological Resources Discipline, FORT Science Center, 2150 Centre Ave., Building C, Fort Collins, CO 80526; 3National Park Service, Water Resources Division, 1201 Oakridge Dr., Ste. 150, Fort Collins, CO 80525 Introduction and Green rivers in Canyonlands National Park. The Yampa River is the longest relatively free-flowing river Water has always been in short supply in the western reach remaining in the Colorado River basin. The U.S., making it a consistent source of conflict. In Green River is highly regulated by Flaming Gorge Dam the Colorado River drainage, an increasing human but is partially restored below its confluence with the population fuels increased demands for water from Yampa River. There have been large-scale changes the river and its tributaries. As a result, streamflow to the Green River since Flaming Gorge Dam was in virtually all of these systems has been altered by completed in 1962. reservoirs and other water-development projects. In most cases, reduced flows have significantly altered Monitoring of these rivers and their riparian peak flows and increased base flows that structure vegetation focuses on processes that affect the river floodplain vegetation, stream-channel morphology, channel, active bars, and riparian floodplains. To get and water quality (e.g., temperature, suspended a complete picture of river conditions, the NCPN sediment, nutrients).
    [Show full text]
  • The Impact of the Endangered Species Act on Glen Canyon Dam Operations and Stakeholders
    The Bottom Line: The Impact of the Endangered Species Act on Glen Canyon Dam Operations and Stakeholders By Leslie James he Endangered Species Act (ESA) is arguably the most powerful environmental law ever enacted. Since its passage in 1973, it has had far-reaching Timpacts on power production from federally owned multiple-purpose projects, such as the Colorado River Storage Project (CRSP). Operational changes resulting from efforts to address ESA issues impact not only power production but repayment of the federal investment in the project. While differing approaches and programs have been established in an attempt to address ESA issues at Glen Canyon Dam, operations have proved to be significant and costly. Background: Colorado River Storage Project In 1956, Congress passed the Colorado River Storage Glen Canyon Dam. Project Act to provide storage facilities for the Upper Basin states so that they could meet Colorado River Compact needs. Operated by the Bureau of Reclamation, the CRSP of total CRSP generation. Flaming Gorge Dam is on the consists of multipurpose dams that release water to meet Green River, a major tributary of the Colorado River, and Colorado River Compact, municipal and industrial (M&I), has three units producing about 132 MW of generation. and irrigation requirements. As the water is released, electric power and energy are produced to help pay for ESA Impacts on Glen Canyon Dam Operations the projects. The Western Area Power Administration The Glen Canyon Dam power plant generates power (WAPA) markets and transmits that electricity to for municipal, industrial, irrigation pumping, and other preference power entities pursuant to federal law.
    [Show full text]
  • Floating the Green River
    Green River Campsites How to get to the Green River All established campgrounds include a table, fire ring, tent pads and benches. River mileages are given beginning at Flaming Gorge Dam. For availability and reservations go to www.reserveUSA.com. All other From Wyoming campsites are on a first come basis. From I-80 just west of Rock The Green River from Little Hole to the Springs, WY, take US-191 to exit 99, travel south to the Utah/Colorado state line is a quiet stretch of major access points at Clay Basin or Dutch John, UT. 1. Stonefly I & II 10. Big Pine Camp I & II 18. Bridge Port Camp 27. Pipeline Camp river surrounded by beautiful scenery, wildlife (FS) North side (river left) (FS) North side (river left) (State) North side (river left) (BLM) East side (river left) Green River Camping From Salt Lake City Mile 8.2. Mile 10.5. Mile 17.3. Mile 22. Take I-80 to exit 34, follow Camping between Little Hole and Indian Crossing and outstanding opportunities for recreation the signs from Fort Bridger to 11. Pugmire Pocket Camp is restricted to designated float-in or hike-in campsites. Manila, UT, then take UT-44 2. Sand Camp 19. River Bend Camp 28. Little Swallow Camp and adventure. Whether you’re interested in (FS) North side (river left) (BLM) South side (river right) (BLM) South side (river right) (BLM) East side (river left) Campers must pack-in/pack-out all trash and build fires to the intersection with US-191. US-191 leads to Mile 8.3.
    [Show full text]
  • Navajo Reservoir and San Juan River Temperature Study 2006
    NAVAJO RESERVOIR AND SAN JUAN RIVER TEMPERATURE STUDY NAVAJO RESERVOIR BUREAU OF RECLAMATION 125 SOUTH STATE STREET SALT LAKE CITY, UT 84138 Navajo Reservoir and San Juan River Temperature Study Page ii NAVAJO RESERVOIR AND SAN JUAN RIVER TEMPERATURE STUDY PREPARED FOR: SAN JUAN RIVER ENDANGERED FISH RECOVERY PROGRAM BY: Amy Cutler U.S. Department of the Interior Bureau of Reclamation Upper Colorado Regional Office FINAL REPORT SEPTEMBER 1, 2006 ii Navajo Reservoir and San Juan River Temperature Study Page iii TABLE OF CONTENTS EXECUTIVE SUMMARY ...............................................................................................1 1. INTRODUCTION......................................................................................................3 2. OBJECTIVES ............................................................................................................5 3. MODELING OVERVIEW .......................................................................................6 4. RESERVOIR TEMPERATURE MODELING ......................................................7 5. RIVER TEMPERATURE MODELING...............................................................14 6. UNSTEADY RIVER TEMPERATURE MODELING........................................18 7. ADDRESSING RESERVOIR SCENARIOS USING CE-QUAL-W2................23 7.1 Base Case Scenario............................................................................................23 7.2 TCD Scenarios...................................................................................................23
    [Show full text]
  • Flaming Gorge Operation Plan - May 2021 Through April 2022
    Flaming Gorge Operation Plan - May 2021 through April 2022 Concurrence by Kathleen Callister, Resources Management Division Manager Kent Kofford, Provo Area Office Manager Nicholas Williams, Upper Colorado Basin Power Manager Approved by Wayne Pullan, Upper Colorado Basin Regional Director U.S. Department of the Interior Bureau of Reclamation • Interior Region 7 Upper Colorado Basin • Power Office Salt Lake City, Utah May 2021 Purpose This Flaming Gorge Operation Plan (FG-Ops) fulfills the 2006 Flaming Gorge Record of Decision (ROD) requirement for May 2021 through April 2022. The FG-Ops also completes the 4-step process outlined in the Flaming Gorge Standard Operation Procedures. The Upper Colorado Basin Power Office (UCPO) operators will fulfil the operation plan and may alter from FG-Ops due to day to day conditions, although we will attempt to stay within the boundaries of the operations defined below. Listed below are proposed operation plans for four different scenarios: moderately dry, average (above median), average (below median), and moderately wet. As of the publishing of this document, the most likely scenario is the moderately dry, however actual operations will vary with hydrologic conditions. The Upper Colorado River Endangered Fish Recovery Program (Recovery Program), the Flaming Gorge Technical Working Group (FGTWG), Flaming Gorge Working Group (FG WG), United States Fish and Wildlife Service (FWS) and Western Area Power Administration (WAPA) provided input that was considered in the development of this report. The FG-Ops describes the current hydrologic classification of the Green River Basin and the hydrologic conditions in the Yampa River Basin. The FG-Ops identifies the most likely Reach 2 peak flow magnitude and duration that is to be targeted for the upcoming spring flows.
    [Show full text]
  • Ashley National Forest Visitor's Guide
    shley National Forest VISITOR GUIDE A Includes the Flaming Gorge National Recreation Area Big Fish, Ancient Rocks Sheep Creek Overlook, Flaming Gorge Painter Basin, High Uinta Wilderness he natural forces that formed the Uinta Mountains are evident in the panorama of geologic history found along waterways, roads, and trails of T the Ashley National Forest. The Uinta Mountains, punctuated by the red rocks of Flaming Gorge on the east, offer access to waterways, vast tracts of backcountry, and rugged wilderness. The forest provides healthy habitat for deer, elk, What’s Inside mountain goats, bighorn sheep, and trophy-sized History .......................................... 2 trout. Flaming Gorge National Recreation Area, the High Uintas Wilderness........ 3 Scenic Byways & Backways.. 4 Green River, High Uintas Wilderness, and Sheep Creek Winter Recreation.................... 5 National Geological Area are just some of the popular Flaming Gorge NRA................ 6 Forest Map .................................. 8 attractions. Campgrounds ........................ 10 Cabin/Yurt Rental ............... 11 Activities..................................... 12 Fast Forest Facts Know Before You Go .......... 15 Contact Information ............ 16 Elevation Range: 6,000’-13,528’ Unique Feature: The Uinta Mountains are one of the few major ranges in the contiguous United States with an east-west orientation Fish the lakes and rivers; explore the deep canyons, Annual Precipitation: 15-60” in the mountains; 3-8” in the Uinta Basin high peaks; and marvel at the ancient geology of the Lakes in the Uinta Mountains: Over 800 Ashley National Forest! Acres: 1,382,347 Get to Know Us History The Uinta Mountains were named for early relatives of the Ute Indians. or at least 8,000 years, native peoples have Sapphix and son, Ute, 1869 huntedF animals, gathered plants for food and fiber, photo courtesy of First People and used stone tools, and other resources to make a living.
    [Show full text]
  • Flaming Gorge Operation Plan - May 2020 Through April 2021
    Flaming Gorge Operation Plan - May 2020 through April 2021 Concurrence by Date Kathleen Callister, Resource Management Division Chief Date ___________, Provo Area Office Manager Date ___________, Upper Colorado Power Manager Approved by Date Brent Esplin, Upper Colorado Regional Director Purpose Blue for changes that will happen This Flaming Gorge Operation Plan (FG-Ops) fulfills the 2006 Flaming Gorge Record of Decision (ROD) requirement for May 2020 through April 2021. The FG-Ops also completes the 4-step process outlined in the Flaming Gorge Standard Operation Procedures. The Upper Colorado Basin Power Office (UCPO) operators will fulfil the operation plan and may alter from FG-Ops due to day to day conditions, although we will attempt to stay within the boundaries of the operations defined below. Listed below are proposed operation plans for 3 different scenarios: moderately dry, average (above / below median), and moderately wet. As of the publishing of this document, the most likely scenario is the average (below median), however actual operations will vary with hydrologic conditions. This operation plan covers Flaming Gorge operation from May 2020 through April 2021 per the Flaming Gorge Final Environmental Impact (EIS). Both the Upper Colorado River Endangered Fish Recovery Program (Recovery Program) and the Flaming Gorge Technical Working Group (FGTWG) along with input from the Flaming Gorge Working Group, United States Fish and Wildlife Service (FWS) and Western Area Power Administration (WAPA) provided input that is incorporated into the Final FG-Ops. The 2005 Final EIS specifically addresses and outlines the content of the FGTWG proposal. This outline is used for the basis of the FG-Ops.
    [Show full text]
  • Dam Failure Study at Glen Canyon
    34 hours for the maximum stage of the flood wave to ar- Dam Failure Study rive at the upper reaches of Lake Powell. Routing the esti- mated flood inflow hydrograph indicated that Glen Can- At Glen Canyon Dam yon Dam would be overtopped for a duration of about 40 hours, with a peak depth of 2.9 feet over the parapet wall. By Stephen E. Latham, While it is unlikely this overtopping flow would cause the Bureau of Reclamation, July 1998 dam to fail, for the purposes of evaluating this scenario, Note: This document is abridged failure was assumed. Outflow assumptions prior to the Overtopping Failure Purpose of Study were as follows. Measures would likely have been taken The purpose of this study is to estimate the magnitude at Glen Canyon Dam to lower Lake Powell, probably by of flooding that would result along the Colorado River from opening the spillways 2 to 3 hours after notification of the Lake Powell to Hoover Dam due to the failure of Glen Can- Flaming Gorge Dam failure. Upon arrival of the flood wave yon Dam. This study was requested, pursuant to policy, by at Lake Powell, it was assumed that the spillway gates the Bureau of Reclamation. This information can be used would be opened uniformly to the normal maximum dis- in Reclamation’s emergency action plan for Glen Canyon charge of 238,000 cfs. Dam, and as a reference in preparing inundation maps for areas downstream of the dam. It can also be used to help Study Results local authorities develop warning and evacuation plans.
    [Show full text]
  • UPPER COLORADO RIVER COMMISSION 355 South Fourth East Street Salt Lake City 11, Utah October 30, 1962 MEMORANDUM TO
    UPPER COLORADO RIVER COMMISSION 355 South Fourth East Street Salt Lake City 11, Utah October 30, 1962 MEMORANDUM TO: Upper Colorado River Commissioners and Advisers FROM: Ival V. Goslin, Executive Director SUBJECT: Construction and Advance Planning Program of the Bureau of Reclamation for the Colorado River Storage Project and participating projects, et al 1 for fiscal year 1963. Note: this tabulation represents the distribution of all funds available including newly appropriated money 1 carry-overs, savings and slippage, etc. According to an announcement from the office of the Secretary of the Interior the details of the Bureau of Reclamation • s program of construction and advance planning for Fiscal Year 1963 include the items on the following pages of particular interest to the Upper Colorado River Basin. The Bureau of Reclamation• s Advance Planning program in the Upper Basin States includes two major projects--the Fryingpan-Arkansas Project in Colorado estimated to cost $170 million and the San Juan-Chama Project in New Mexico estimated to cost $8 6 million. The three "new start" construction reclamation projects for which Congress appropriated funds for fiscall963 are: 1. Glen Elder Unit, Missouri River Basin Project, Kansas 2. Oake Unit, James Section, Missouri River Basin Project, South Dakota 3. Morrow Point facilities I Curecanti Unit, CRSP, Colorado STORAGE UNITS: Glen Canyon Storage Unit $4514021191 --to continue placement of concrete in Glen Canyon Dam and to continue construction of the powerplant and switch­ yard; to continue progress payments on the turbines 1 generators I governors I and other materials and equipment furnished .by the government.
    [Show full text]
  • April 24-Month Study Date: April 15, 2021 From
    April 24-Month Study Date: April 15, 2021 From: Water Resources Group, Salt Lake City To: All Colorado River Annual Operating Plan (AOP) Recipients Current Reservoir Status March Percent April 14, April 14, Reservoir Inflow of Average Midnight Midnight (unregulated) (%) Elevation Reservoir (acre-feet) (feet) Storage (acre-feet) Fontenelle 40,460 77 6,473.21 126,000 Flaming Gorge 67,600 66 6,025.37 3,173,900 Blue Mesa 28,600 79 7,464.12 392,900 Navajo 24,500 27 6,034.00 1,049,400 Powell 296,700 45 3,564.74 8,688,600 _______________________________________________________________________ Expected Operations The operation of Lake Powell and Lake Mead in this April 2021 24-Month Study is pursuant to the December 2007 Record of Decision on Colorado River Interim Guidelines for Lower Basin Shortages and the Coordinated Operations of Lake Powell and Lake Mead (Interim Guidelines), and reflects the 2021 Annual Operating Plan (AOP). Pursuant to the Interim Guidelines, the August 2020 24-Month Study projections of the January 1, 2021, system storage and reservoir water surface elevations set the operational tier for the coordinated operation of Lake Powell and Lake Mead during 2021. The August 2020 24-Month Study projected the January 1, 2021, Lake Powell elevation to be below the 2021 Equalization Elevation of 3,659 feet and above elevation 3,575 feet. Consistent with Section 6.B of the Interim Guidelines, Lake Powell is operating under the Upper Elevation Balancing Tier for water year 2021. With an 8.23 million acre-foot (maf) release from Lake Powell in water year 2021, the April 2021 24-Month Study projects the end of water year elevation at Lake Powell to be below 3,575 feet.
    [Show full text]
  • Utah Scenic Byways Guide
    Utah is the place where prehistory intersects with the enduring spirit of the Old West. Wild, adventure-rich places cradle vibrant urban centers. With interstates and airplanes, the world can feel pretty small. On Utah’s designated scenic byways, the world feels grand; its horizons seem infinite. As you drive through Utah, you’ll inevitably encounter many of the state’s scenic byways. In total, Utah’s distinct topography provides the surface for 27 scenic byways, which add up to hundreds of miles of vivid travel experiences wherein the road trip is as memorable as the destination. Utah’s All-American Road: Scenic Byway 12 headlines the network of top roads thanks to landscapes and heritage unlike anywhere else in the nation. All of Utah’s scenic byways are explorative journeys filled with trailheads, scenic overlooks, museums, local flavors and vibrant communities where you can stop for the night or hook up your RV. Not sure where to start? In the following pages, you’ll discover monumental upheavals of exposed rock strata among multiple national and state parks along the All-American Road (pg. 4); dense concentrations of fossils along Dinosaur Diamond (pg. 8); and the blazing red cliffs and deep blue waters of Flaming Gorge–Uintas (pg. 12) — and that’s just in the first three highlighted byways. Your journey continues down two dozen additional byways, arranged north to south. Best of all, these byways access an outdoor adventureland you can hike, fish, bike, raft, climb and explore from sunup to sundown — then stay up to welcome the return of the Milky Way.
    [Show full text]