|Document Type:||Journal Article|
|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|
|Journal:||Transactions of the American Fisheries Society|
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.