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NOAA Fisheries Service Northwest Fisheries Science Center Fish Ecology Division

Behavior and Survival for Juvenile Salmonids Passing Ice Harbor Dam during reduced and BiOp spill treatments, 2006-07. Gordon Axel, Eric Hockersmith, and Darren Ogden. NOAA Fisheries Service Northwest Fisheries Science Center Fish Ecology Division U. S. Army Corps of Engineers

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NOAA Fisheries Service Northwest Fisheries Science Center Fish Ecology Division

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  1. Behavior and Survival for Juvenile Salmonids Passing Ice Harbor Dam during reduced and BiOp spill treatments, 2006-07 Gordon Axel, Eric Hockersmith, and Darren Ogden NOAA Fisheries Service Northwest Fisheries Science Center Fish Ecology Division U. S. Army Corps of Engineers Northwestern Division Walla Walla District

  2. Results - Ice Harbor DamSpringOperations

  3. Results - Yearling Chinook Salmon: First Approach BiOp Spill Reduced Spill % at non-turbine routes: 88% % at non-turbine routes: 80% 2006 % at non-turbine routes: 87% % at non-turbine routes: 80% 2007

  4. Results - Yearling Chinook Salmon: Passage Distribution BiOp Spill Reduced Spill % thru non-turbine routes: 95% % thru non-turbine routes: 93% 2006 % thru non-turbine routes: 98% % thru non-turbine routes: 92% 2007

  5. Results – Juvenile Steelhead: First Approach BiOp Spill Reduced Spill % at non-turbine routes: 91% % at non-turbine routes: 83% 2006 % at non-turbine routes: 96% % at non-turbine routes: 88% 2007

  6. Results – Juvenile Steelhead: Passage Distribution BiOp Spill Reduced Spill % thru non-turbine routes: 99% % thru non-turbine routes: 98% 2006 % thru non-turbine routes: 99% % thru non-turbine routes: 99% 2007

  7. Survival Results – Yearling Chinook Salmon Forebay Delay (h) 1.8 1.1 2.0 1.5

  8. Survival Results – Juvenile Steelhead Forebay Delay (h) 1.9 1.1 1.8 1.7

  9. Results - Ice Harbor DamSummerOperations

  10. Results - Subyearling Chinook Salmon: First Approach % at non-turbine routes: 93%

  11. Results - Subyearling Chinook Salmon: Passage Distribution % thru non-turbine routes: 98%

  12. Survival Results – Subyearling Chinook Salmon Forebay Delay (h) 2.0

  13. Conclusions • No difference in survival by species, treatment, or flow years • BiOp spill slightly reduces forebay residence; though does not significantly alter forebay loss • Increasing percentage of river flow through RSW by 4% increased passage through RSW by 8% for yearling Chinook and 36% for steelhead • Increasing the forebay depth by one foot at Ice Harbor could increase percentage of flow through the RSW by 2% during a high flow year and 3% during a low flow year

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