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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Presentation transcript:

Evaluation of Fish Passage Distribution at the Ice Harbor Removable Spillway Weir, 2006 Kenneth Ham Shawn Reese Scott Titzler Russ Moursund

2 ObjectiveObjective 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

3 Methods: 2006 RSW Sampling Included Frame Mount and New Magnet-Mount Deployments

4 Results: Fish Pass Near the Surface in Spring

5 Fish Passage is Deeper in Summer

6 Vertical Distribution At Release Pipe Similar Across Deployments Release elevation (ft above crest) Upstream Deployment Downstream Deployment Spring 1.511%9% 6.569%88% Summer 1.527%24% 6.580%89%

7 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 periods