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We evaluated the effectiveness of new screening facilities at the Toppenish Creek, Wapato, and Sunnyside canals in southcentral Washington State. Screen integrity tests indicated that fish released in front of the screens were prevented from entering the canal behind the screens. Screen efficiency estimates are 99% ({+-}0.6%) for Toppenish Creek, 99% ({+-}0.3%) for Wapato, and 98% ({+-}0.5%) for Sunnyside. During 1987 at the Wapato Canal, we estimated screen efficiency was 97% ({+-}l%). We conducted descaling tests at the Toppenish Creek Screens. We estimated that 0.2% of steelhead Qncorhynchus mykiss smelts released during tests were descaled. None of the fish released through the fish return pipe were descaled. We measured the time required for fish to move through the screen facilities. The time required for 50% of the test fish to exit the Toppenish Creek Screen forebay was 4 to 9 h for rainbow trout fry and up to 39 h for steelhead smelts. The time for 50% of the test fish to exit the Wapato and Sunnyside screen forebays was less than 8 h. As with past studies, exit times varied with canal flow and species. After 39 h at Toppenish Creek, half the steelhead smelts were still in the forebay when canal flows were 20 cfs. At Sunnyside, half the chinook salmon fry exited the forebay in 1 h or less. Methods used in 1988 were the same as those used at Sunnyside in 1985 and in subsequent years at Richland, Toppenish/Satus, and Wapato. The methods and previous results have been reviewed by the Washington State Department of Fisheries, U.S. Fish and Wildlife Service, National Marine Fisheries Service, Northwest Power Planning Council, and Yakima Indian Nation

A Fisheries Evaluation of the Wapato, Sunnyside and Toppenish Creek Canal Fish Screening Facilities, Spring 1988 : Annual Report.