Abstract
A habitat-based system was evaluated as a means of classifying small watersheds. Streams from four land-type associations in the Black Hills National Forest were segregated qualitatively by means of physical characteristics determined from transect data and stratified by habitat type. The biomass of brown trout Salmo trutta could be categorized by habitat composition, but the biomass of brook trout Salvelinus fontinalis could not be. Segregating watersheds by both physical and biological characteristics of individual habitat units provides resource managers with a functional classification scheme. However, the usefulness of this approach depends on a consistent response of fish to habitat quality.
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