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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 - PowerPoint PPT Presentation
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Behavior and Survival for Juvenile Salmonids Passing Ice Harbor Dam during reduced and BiOp
spill treatments, 2006-07
NOAA Fisheries ServiceNorthwest Fisheries Science Center
Fish Ecology Division
U. S. Army Corps of EngineersNorthwestern Division
Walla Walla District
Gordon Axel, Eric Hockersmith, and Darren Ogden
Results - Ice Harbor Dam Spring Operations
2006 (High Flow)Reduced BiOp
2007 (Low Flow)Reduced BiOp
Total River Flow (kcfs) 120 144 75 79
Mean Training Spill (kcfs) 32 76 15 46
% Spill Training 26% 52% 20% 58%
Mean RSW (kcfs) 8 8 8 8
% RSW Spill 7% 6% 11% 10%
Results - Yearling Chinook Salmon: First Approach20
0720
06
BiOp Spill Reduced Spill
% at non-turbine routes: 88% % at non-turbine routes: 80%
% at non-turbine routes: 87% % at non-turbine routes: 80%
2007
2006
BiOp Spill Reduced Spill
% thru non-turbine routes: 95% % thru non-turbine routes: 93%
% thru non-turbine routes: 92%% thru non-turbine routes: 98%
Results - Yearling Chinook Salmon: Passage Distribution
2007
2006
BiOp Spill Reduced Spill
% at non-turbine routes: 91% % at non-turbine routes: 83%
% at non-turbine routes: 96% % at non-turbine routes: 88%
Results – Juvenile Steelhead: First Approach
BiOp Spill Reduced Spill
2007
2006
% thru non-turbine routes: 99% % thru non-turbine routes: 98%
% thru non-turbine routes: 99%% thru non-turbine routes: 99%
Results – Juvenile Steelhead: Passage Distribution
Survival Results – Yearling Chinook Salmon
2006 (High Flow)Reduced BiOp
2007 (Low Flow)Reduced BiOp
Spill Survival 96% 96% 97% 96%
RSW Survival 95% 96% 95% 95%
Dam Survival 91% 92% 94% 92%
Concrete Survival 96% 96% 95% 96%
Forebay Delay (h) 1.8 1.1 2.0 1.5
Survival Results – Juvenile Steelhead
2006 (High Flow)Reduced BiOp
2007 (Low Flow)Reduced BiOp
Spill Survival 100% 100% 97% 97%
RSW Survival 100% 98% 97% 98%
Dam Survival 90% 94% 94% 93%
Concrete Survival 100% 100% 97% 96%
Forebay Delay (h) 1.9 1.1 1.8 1.7
Results - Ice Harbor Dam Summer Operations
2006 (High Flow)
Total River Flow (kcfs) 56
Mean Training Spill (kcfs) 22
% Spill Training 40%
Mean RSW (kcfs) 8
% RSW Spill 14%
Results - Subyearling Chinook Salmon: First Approach
% at non-turbine routes: 93%
Results - Subyearling Chinook Salmon: Passage Distribution
% thru non-turbine routes: 98%
Survival Results – Subyearling Chinook Salmon
2006 (High Flow)
Spill Survival 99%
RSW Survival 98%
Dam Survival 95%
Concrete Survival 98%
Forebay Delay (h) 2.0
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