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Passage behavior and survival of radio-tagged yearling chinook salmon and steelhead at Ice Harbor Dam, 2006
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2007
[PDF-18.04 MB]
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Description:In 2006, we evaluated behavior, passage distributions, and survival of yearling Chinook salmon and steelhead at Ice Harbor Dam to determine effects of the recently installed removable spillway weir (RSW) in relation to two different spill treatments. Fish were collected, PIT tagged, and surgically tagged with a radio transmitter at Lower Monumental Dam. Treatment groups were comprised of 1,438 yearling Chinook salmon and 1,189 juvenile steelhead released 5 km above Lower Monumental Dam and 1,136 yearling Chinook salmon and 967 juvenile steelhead released into the tailrace of Lower Monumental Dam. Reference groups were comprised of 1,545 yearling Chinook salmon and 1,574 juvenile steelhead released into the tailrace of Ice Harbor Dam. Releases occurred during both day and night operations over 29 d, from 3 to 31 May. Project operations at Ice Harbor Dam consisted of 2-d random blocks alternating between BiOp spill (45 kefs during the day and gas cap at night) and a reduced spill treatment of 30- 40%, both with the RSW operating continuously. However, due to high river flows, the treatment schedule was altered.
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Rights Information:CC0 Public Domain
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