Evaluation of rotating drum screen facilities in the Yakima River basin, south-central Washington state
Fisheries Bioengineering Symposium: American Fisheries Society Symposium 10
Colt J;White RJ;
American Fisheries Society
Field-test data from four rotating drum screen facilities indicate that juvenile salmonids are safely returned from the fish screen facility to the river from which the fish were diverted. This conclusion is based on five observations: (1) release-recapture tests with branded salmonids indicated fish that passed through the screening facility were not killed or injured at different rates from control groups; (2) predators were not concentrated within the screen facility; (3) test groups of fish were not delayed within the screen facility; (4) screens with properly maintained seals prevented fish from passing through the screen structure; and (5) altered operating flow conditions did not adversely affect test conclusions. Tests were conducted with smolts of steelhead Oncorhynchus mykiss and spring chinook salmon Oncorhynchus tshawytscha , and with fall chinook salmon fry. More than 11,000 fish were released during the tests. Conclusions are based on the condition of nearly 8,000 test fish captured. Tests were conducted at the Sunnyside, Richland, Toppenish/Satus, and Wapato Canal Fish Screening Facilities in south-central Washington State.