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Survival and Behavior Study of Juvenile Salmonids Passing Ice Harbor Dam

This study conducted by NOAA Fisheries and the U.S. Army Corps of Engineers focuses on the survival and behavior of juvenile Chinook salmon and steelhead passing through Ice Harbor Dam with reduced and BiOp spill treatments from 2006-2007. Results indicate passage distribution and forebay residence were affected by treatment and flow variations. Increasing river flow percentages through the removable spillway gate improved passage rates. The study also suggests that adjusting forebay depth could enhance flow passage efficiency during different flow conditions.

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Survival and Behavior Study of Juvenile Salmonids Passing Ice Harbor Dam

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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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