Abstract We described redds of 20-40 cm brown trout Salmo trutta in a mountain stream in the Central Rocky Mountains. Average redd length was 147 cm, water depth 16 cm, and water velocity 34 cm/s, but variation was substantial. Brown trout selected water depths of 12-18 cm and velocities of 24-37 cm/s and avoided depths less than 6 cm and velocities less than 12 cm/s. Water depths and velocities measured over redds in 1987 and 1988 were similar to those measured in 1975 despite a 50-100% increase in the minimum flow during the 1987 and 1988 spawning periods.
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