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Post-construction evaluation of the new juvenile bypass system and guidance screen modifications at John Day Dam, 1998
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2000
[PDF-11.34 MB]
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Description:Modifications to the John Day Dam juvenile salmonid sampling facility and bypass system were completed and the system was ready for operation in April 1998, at the beginning of the spring outmigration. This bypass system is similar to others on the Snake and Columbia Rivers which have been constructed during the 1990s at Little Goose, Lower Monumental, Ice Harbor, and McNary Dams. The John Day facility does not have raceways to hold fish for transportation, but does include a hydraulic jump and a wetted separator which are unique to this project. We examined juvenile salmonids for descaling and gross external injuries, analyzed blood samples for evidence ofstress build-up, and evaluated the efficiency ofthe sampling system.
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Rights Information:CC0 Public Domain
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