Evaluation of Fish Passage Evaluation of Fish Passage Distribution at the Ice Distribution at the Ice Harbor Removable Spillway Harbor Removable Spillway Weir, 2006 Weir, 2006 Kenneth Ham Kenneth Ham Shawn Reese Shawn Reese Scott Titzler Scott Titzler Russ Moursund
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Evaluation of Fish Passage Distribution at the Ice Harbor Removable Spillway Weir, 2006 Kenneth Ham Shawn Reese Scott Titzler Russ Moursund.
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Evaluation of Fish Passage Evaluation of Fish Passage Distribution at the Ice Harbor Distribution at the Ice Harbor
Evaluate the distribution of fish approaching and passing the Ice Harbor Removable Spillway Weir (RSW) relative to balloon tag and sensor fish device release elevations
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Methods:Methods:2006 RSW Sampling Included Frame Mount 2006 RSW Sampling Included Frame Mount
and New Magnet-Mount Deploymentsand New Magnet-Mount Deployments
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Results:Results:Fish Pass Near the Surface in SpringFish Pass Near the Surface in Spring
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Fish Passage is Deeper in SummerFish Passage is Deeper in Summer
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Vertical Distribution At Release Pipe Vertical Distribution At Release Pipe Similar Across DeploymentsSimilar Across Deployments
Release elevation
(ft above crest)
Upstream Deployment
Downstream Deployment
Spring1.5 11% 9%
6.5 69% 88%
Summer1.5 27% 24%
6.5 80% 89%
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ConclusionsConclusions
Fish pass near the RSW crest 11% and 27% at or below the 1.5ft release point in the
spring and summer, respectively Similar results regardless of deployment
Late Summer conditions increase the proportion passing near the crest Higher RSW Proportion of flow (less tainter spill) would
likely result in a higher proportion of passage Migrants distributed nearer RSW crest than other