The Bonneville Lock and Dam Powerhouse Adult Fish Collection System Evaluation: 1976-1978




adult, Bonneville Dam, channel, chinook, Columbia River, entrance, fish ladder, fish passage, hydraulic conditions, laboratory study, Oncorhynchus tshawytscha, salmon, tailrace


The Bonneville Dam first powerhouse adult fish collection and passage system efficiency was evaluated in 1976, 1977, and 1978 with the use of impedance tunnels, radiotagged fish, and onsite laboratory studies. The profiles of fish entry into the collection channel showed a consistent difference between spring and fall runs. The profiles were effected by specific mechanical and hydraulic conditions in the tailrace and at the entrances. Differences in profiles may also be associated with behavioral differences between races of fish. Fish passage within the passage facilities was found to be related to the hydraulic conditions but not directly effected by excess aeration. The movement of radiotagged chinook salmon (Oncorhynchus tshawytscha) in the tailrace and within the collection channel was intensively investigated and analysed using frequency distributions and transition matrices. Elapsed passage times, fallback, holding areas, entry rates, and collection channel movement were revealed for the adult chinook salmon.

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