WWRC 87-26
Winter Stream Conditions and Use of Habitat
by Brook Trout in High-Elevation Wyoming Streams
Abstract
Winter stream conditions at elevations between 2,280 and 3,205 m above mean sea
level and the use of winter habitat by adult brook trout Salvelinus fontinalis above 2,990 m were
evaluated in 1983-1984 and 1984-1985. Little surface ice was observed at elevations above 2,900
m, which was associated with high snow accumulation; moderate surface ice and anchor ice
formation were observed at elevations from 2,550 to 2,900 m; extensive surface ice formation
occurred at 2,550 m. Little snow accumulated at 2,550 m and surface ice physically excluded
substantial brook trout habitat. In late fall, brook trout at elevations above 2,990 m tended to
move into loow-gradient area where they remained active throughout the winter. During winter,
brook trout appeared to select for areas with maximum velocities of 15 cm/s or less, measured
during summer low flow, and for deeper water, but not for substrate type.
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