Hydroacoustic Assessment of Downstream Migrating Salmonids at the Dalles Dam in Spring and Summer 1985




chinook, Columbia River, downstream fish passage, hydroacoustics, juvenile, juvenile salmon, regression, Rock Island Dam, salmon, salmonids, Snake River, sockeye salmon, steelhead, Dalles Dam


None supplied. From executive summary: From April 22 to August 15, 1985, BioSonics, Inc conducted a hydroacoustic study of downstream migrating salmon and steelhead at The Dalles Dam. The primary objective of this study was to estimate the effectiveness of the spillway and sluiceway in passing downstream migrants. The secondary goals of this study were to provide information on the horizontal, vertical, and temporal distribution of downstream migrants. The study was separated into two periods. The spring season was from April 22 to June 1, and the summer season was from July 1 to August 15, 1985. Nineteen transducers were deployed to monitor turbine, spillway, and sluiceway locations.

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