Gauley, J RThompson, C S2024-04-262024-04-261963https://hdl.handle.net/20.500.14394/28188The rates of passage of chinook (Oncorhynchus tshawytscha) and sockeye (O. nerka) salmon and steelhead trout (Salmo gairdneri) were studied in 1:16- and 1:8-slope, pool-and-overfall fishways. In general, the passage of salmonids through the 1:8-slope fishway was a 1.0-foot rise between pools was as fast as, or faster than, in the 1:16-slope fishway with a 1.0-foot rise. When the rise between pools was increased to 1.5 feet in the 1:8-slope fishway, chinook and sockeye were slower. The 'Dallas-type' weir crests in a 1:16-slope fishway appeared to accelerate chinook passage. Chinook and sockeye displayed seasonal differences in times within species.Bonneville DamchinookDalles Weir crestfish passageOncorhynchus tshawytschapoolrate of passagesalmonsalmonidsslopesteelheadtroutweirarticle