Northwest Fisheries Science Center

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Document Type: Journal Article
Center: NWFSC
Document ID: 7752
Title: Delayed migrations of yearling Chinook salmon since completion of Lower Monumental and Little Goose Dams on the Snake River
Author: Wallace W. Bentley, Howard L. Raymond
Publication Year: 1976
Journal: Transactions of the American Fisheries Society
Volume: 105
Issue: 3
Pages: 422-424

Travel time for yearling chinook salmon Oncorhynchus tshawytscha to migrate the 370 km downstream from the Salmon River to Ice Harbor Dam was compared during 3 years prior (1966-1968) and 4 years after (1970-1974) impounding of the Snake River behind Lower Monumental and Little Goose Dam.  Prior to impounding, fish averaged 15 d of travel time to Ice Harbor Dam during low flows (1,000-2,000 m3/s) and 9 d during moderate flows (2,300-4,000 m3/s).  After the new impoundments, average travel time was increased to 31 d in low flows and 20 d in moderate flows—a measured delay of 16 and 11 d, respectively.

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