Tag: temperature
  • 23-045 Dworshak Dam releases reducing to minimums by the end of September

    AHSAHKA, Idaho – Dworshak Dam is currently releasing 9,200 cubic feet per second for summer temperature operations. Starting Sept. 1, Dworshak will gradually decrease discharge to 1,600 cfs by the end of the month.
  • 23-036 Dworshak dam increasing releases on Friday to balance full pool

    AHSAHKA, Idaho – Releases from Dworshak Dam will increase to match inflow into the reservoir. This operation is intended to maintain the reservoir at its full pool.
  • 21-034 Dworshak Dam updates their release schedule for flow augmentation

    AHSAHKA, Idaho – Due to an intensifying regional heatwave, Dworshak Dam will be further increasing their releases to support flow augmentation intended to keep the tailwater of Lower Granite at or below 68° F.
  • 21-033 Dworshak Dam to increase releases for flow augmentation

    AHSAHKA, Idaho – Dworshak Dam releases will increase from 1,500 cubic feet per second (cfs) on Tuesday to the maximum powerhouse capacity of 9,400 cfs by Thursday night. The river will rise approximately 0.5 feet during the flow changes Tuesday night. The river level is then expected to remain in the same range through the end of the week. This increase in releases is being made to support flow augmentation intended to keep the tailwater of Lower Granite at or below 68° F.
  • 21-032 Dworshak Dam continues to refill as flow augmentation season approaches

    AHSAHKA, Idaho –Dworshak Dam releases will remain at 1,600 cubic feet per second (cfs) as the reservoir continues to refill throughout the month. This operation is intended to capture as much water as possible before the start of flow augmentation.
  • 16-034 Corps improving fish passage at Lower Granite Dam Two new construction projects expected to increase fish survival as they pass the dam

    POMEROY, Wash. – The Walla Walla District of the U.S. Army Corps of Engineers is improving both adult and juvenile fish passage at Lower Granite Lock and Dam to help endangered salmon and steelhead migrate in the lower Snake River. Two significant new fish passage improvements are in progress: First, to prepare for potential high water temperatures this summer and help upstream-migrating adult salmon and steelhead pass Lower Granite Dam, the Corps completed installing a permanent adult fish ladder water cooling system in February. This new Adult Fish Ladder Temperature Improvement System was built in response to unusually hot weather the past several years throughout the Columbia-Snake river basin. Hot weather raised temperatures in the “tailwater” just below Lower Granite Dam in summer to more 68 degrees Fahrenheit, which is above acceptable limits. Hotter water promoted development of a “thermal barrier” in the adult fish ladder, hindering upstream migration of adult salmon and steelhead to their spawning grounds. Sockeye salmon were most affected in summer 2015, though the Corps used temporary pumps to cool the fish ladder in 2014 and 2015. This permanent system will cool fish ladder water starting this summer.