Effect of John Day Reservoir on the migration rate of juvenile Chinook salmon in the Columbia River
migration, juvenile, chinook, salmon, John Day Dam, Columbia River, Ice Harbor Dam, Dalles Dam
Journal or Book Title
Transactions of the American Fisheries Society
John Day Dam, completed in April 1968, is about 350 km from the mouth of theColumbia River. Its reservoir, which was filled to normal size at that time, is 122 km long, nearlytwice that of McNary. Raymond (1968) found that movements of yearling Chinook salmon(Oncorhynchus tshawytscha) were slowed significantly in the McNary Reservoir and speculatedthat similar delays might occur after John Day Reservoir was formed. This paper compares themigration rate of juvenile Chinook salmon from Ice Harbor Dam (above John Day Reservoir) tothe Dalles Dam (below John Day Dam) prior to and after the creation of the John Day Reservoir.