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Evaluation Of Fishway Modifications To Improve Passage Of Adult Chinook Salmon And Steelhead Through The Transition Pool At Lower Granite Dam, 2006 Item Info
- Title:
- Evaluation Of Fishway Modifications To Improve Passage Of Adult Chinook Salmon And Steelhead Through The Transition Pool At Lower Granite Dam, 2006
- Report Type:
- Technical Report
- Date:
- 2007
- Authors:
- Clabough, T.S.; Naughton, G.P; Jepson, M.A.; Caudill, C.C.; Peery, C.A.; Burke, B.J.
- Affiliations:
- Fish and Wildlife Sciences, University of Idaho; National Marine Fisheries Service, National Oceanic and Atmospheric Administration
- Report Number:
- 2007-1
- Publisher:
- University of Idaho
- Funder:
- U.S. Army Corps of Engineers, Portland District; U.S. Army Corps of Engineers, Walla Walla District
- Abstract:
- Previous studies of Pacific salmonid passage over Snake River dams indicated slowed passage at transition pools in adult fishways. In 2001 and 2002, we conducted an experiment to determine if modified weirs affected adult salmon and steelhead passage times and route selection through the Lower Granite Dam transition pool. Attraction flows through weir orifices were experimentally manipulated using removable aluminum panels. Results from these studies indicated a greater proportion of radio-tagged spring– summer Chinook salmon passed straight through the transition pool when the panels were deployed, and mean transition pool passage times were significantly lower. Based on these results, the U.S. Army Corps of Engineers modified the fish ladder at Lower Granite Dam in 2006. Modifications included narrowing the junction pool walls and increasing the weir crest height of the lower eleven weirs. To evaluate the effectiveness of the modifications, we radio-tagged and monitored adult spring–summer and fall Chinook salmon and steelhead as they passed Little Goose and Lower Granite dams and compared their performance to that measured during previous years without modifications in place. Transition pool passage times at Lower Granite Dam for spring– summer Chinook were significantly faster in 2006 than in 2003 and 2004 (non-modified years) and the other runs exhibited similar, though not statistically different responses. The frequency of downstream exits out of the transition pool back to the collection channel or tailrace for spring-summer Chinook salmon at Lower Granite Dam in 2006 were lower than in 2003 and 2004. We also compared the relative passage times by individual fish at Little Goose and Lower Granite dams in an effort to statistically control for interannual variation river environment. For all runs, we found that passage time was relatively faster at Lower Granite Dam compared to Little Goose Dam in 2006 versus 2003 and 2004. While the results generally support the hypothesis that the weir modifications improved passage and provide no evidence that the modifications worsened passage conditions, we caution that rigorous conclusions can not be made because behaviors were made for only one year post-modification and inter-annual variability in pool passage times can be high.
- Species:
- Steelhead, Oncorhynchus mykiss Chinook salmon, Oncorhynchus tshawytscha
- Location:
- Lower Granite Dam; Columbia River
- Subjects:
- salmonids Federal Columbia River Power System FCPRS radiotelemetry migration passage behavior fishways modifications
- Source:
- University of Idaho, Fish Ecology Research Lab
- Original Filename:
- 2007-01-CK-SH-transition-pool-passage-in-relation-to-fishway-modifications-Lower-Granite-2006.pdf
- Format:
- application/pdf
Source
- Preferred Citation:
- "Evaluation Of Fishway Modifications To Improve Passage Of Adult Chinook Salmon And Steelhead Through The Transition Pool At Lower Granite Dam, 2006", Adult Salmon and Steelhead Migration Studies: 1996-2014, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/ferl/items/ferl-tr-2007-1.html
Rights
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