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Effects Of Spill In Fall On Passage Of Adult Steelhead At John Day Dam, 1997 Item Info
- Title:
- Effects Of Spill In Fall On Passage Of Adult Steelhead At John Day Dam, 1997
- Report Type:
- Technical Report
- Date:
- 1999
- Authors:
- Bjornn, T.C.; Peery, C.A.; Tolotti, K.R.; Stuehrenberg, L.C.
- Affiliations:
- Idaho Cooperative Fish and Wildlife Research Unit; National Marine Fisheries Service, National Oceanic and Atmospheric Administration
- Report Number:
- 99-5
- Publisher:
- University of Idaho
- Funder:
- U.S. Army Corps of Engineers, Portland District; Bonneville Power Administration
- Abstract:
- A study was conducted in 1997 to determine the effects of low levels of daytime spill during the early fall on use of the north-shore fishway by steelhead at John Day Dam. Passage of steelhead with transmitters were monitored at the dam during alternating periods with and without daytime spill at the north end of the spillway. We found no significant difference in the proportion of steelhead that first approached and first entered the north-shore entrance (NSE), or eventually passed the dam using the north-shore fishway on days with and without spill. Likewise, median passage times for steelhead to first approach, first enter, and pass the dam using the north-shore fishway were not significantly different with and without spill. Spill levels used during the study averaged 1.7 kcfs, or about 1% of river flow on days with spill, and were insufficient to counter the outflow from the powerhouse near the south shore.
- Species:
- Steelhead, Oncorhynchus mykiss
- Location:
- Columbia River; John Day Dam
- Subjects:
- salmonids Federal Columbia River Power System FCPRS radiotelemetry migration fishways passage behavior spill levels experimental design vertical-slot weirs
- Source:
- University of Idaho, Fish Ecology Research Lab
- Original Filename:
- 1999-05-John-Day-spill-effects-on-SH-passage-1997.pdf
- Format:
- application/pdf
Source
- Preferred Citation:
- "Effects Of Spill In Fall On Passage Of Adult Steelhead At John Day Dam, 1997", Adult Salmon and Steelhead Migration Studies: 1996-2014, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/ferl/items/ferl-tr-99-5.html
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