Passage Behavior and Survival for Radio-tagged Subyearling Chinook Salmon at Ice Harbor Dam, 2006 Fish Ecology Division Northwest Fisheries Science Center.

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Presentation transcript:

Passage Behavior and Survival for Radio-tagged Subyearling Chinook Salmon at Ice Harbor Dam, 2006 Fish Ecology Division Northwest Fisheries Science Center NOAA Fisheries Service and U. S. Army Corps of Engineers Northwestern Region Walla Walla District Darren A. Ogden

2006 Results: Passage distribution Spillway JBS T1 T2 T3 T4 T5 T6 S1 rsw S3 S4 S5 S6 S7 S8 S9 S10 Powerhouse Flow

2006 Results: Passage metrics 94.0% (91.77 – 96.23%)Spill Efficiency 70.4% (52.83 – 87.97%)Fish Guidance Efficiency 0.82 (0.78 – 0.86)Training Spill Effectiveness 4.56 (4.50 – 4.62)RSW Effectiveness 2.01 (1.98 – 2.04)Spill Effectiveness 98.2% (96.95 – 99.45%)Fish Passage Efficiency

2006 Results: Relative survival 95% C.I.S.E. Relative Survival – Dam ( forebay BRZ to tailrace) – Concrete (all fish passing the dam) – Spillway (fish passing through the spillway) RSW (fish passing only through the RSW) –

2006 Results Summary 75% of the fish approached the RSW area first (spill bays 1-3). 94% of the fish passed through the spillway. 68% through the RSW. Forebay residence time was shorter than previous years (2 hours). Passage metrics: all high RSW efficiency: increased % spill, decreased % efficiency. Tailrace egress time was less than 11 minutes. All relative survival estimates for actively migrating subyearling Chinook salmon were high.