Above Average Snowpack will Enhance Temporary Increase in Releases from Flaming Gorge Dam to Benefit Endangered Fish
Media Contact: Lisa Iams, 801-524-3673
Heather Patno, 801-524-3883
For Release: May 28, 2014
SALT LAKE CITY - Above average snowpack in the upper Green River Basin will enable Reclamation to increase the overall duration of the planned temporary increase in releases from Flaming Gorge Dam to benefit endangered razorback sucker in the Green River below the dam.
Scientists have detected the presence of larval razorback sucker in critical nursery habitat in the flood plains in the Green River which is the 'trigger' for increasing releases from Flaming Gorge Dam. Beginning Monday, June 2, 2014, flows will increase to powerplant capacity 4,600 cubic-feet-per-second for approximately 14 days or until the flows in the Yampa River decrease to between 12,000-13,000 cfs. Bypass releases from the dam will then be initiated to support a total downstream release of 8,600 cfs for another 14 days to maintain the desired total flow in the river of 18,600 cfs at target locations.
Flows from Flaming Gorge Dam have been temporarily increased during the spring since 2011 as part of a multi-year cooperative experimental program to benefit the endangered razorback sucker. Flaming Gorge Reservoir is expected to receive 135 percent of average inflow volume this year supporting a longer increased release period.
Scientists have been monitoring the critical habitat to detect the first emergence of razorback sucker larvae as a 'trigger' for an experiment being implemented by Reclamation in cooperation with the U.S. Fish and Wildlife and Upper Colorado River Endangered Fish Recovery Program. A major purpose of the experiment is to transport as many larval fish as possible into critical nursery habitat which exists in the floodplains along the Green River downstream of the confluence of the Green and Yampa rivers. This nursery habitat connects to the river at flows at or above 18,600 cfs, which is the targeted flow this year with the above average hydrology. The increased releases from the dam combined with the Yampa River flows will provide the maximum possible flow to transport the larval fish.
Current projections are for the Yampa River to reach at least 16,400 cfs this Friday, May 30, and for flows to remain elevated between 15,000 to 16,000 cfs through June 5. The projected peak at Jensen, Utah, resulting from the combined flows of the Yampa River and Flaming Gorge releases is approximately 20,000 to 22,000 cfs.
The Utah Division of Wildlife Resources has been consulted concerning the impacts of the releases to the rainbow trout fishery below the dam. While releases during this period will make fishing the river more difficult, no adverse impacts to the fishery are expected.
# # #
Reclamation is the largest wholesale water supplier and the second largest producer of hydroelectric power in the United States, with operations and facilities in the 17 Western States. Its facilities also provide substantial flood control, recreation, and fish and wildlife benefits. Visit our website at www.usbr.gov and follow us on Twitter @USBR.