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STUDY AREA The Little Snake River is an unregulated tributary of the Yampa River in the Green River drainage. It drains the Southern Rocky Mountains and the Wyoming Basin of Colorado and Wyoming (Figure 1). The river flows past two small communities: Dixon, population 82; and Baggs, population 433 (Bureau of Census 1992). Lower elevation tributaries upstream of Baggs, Wyoming (elevation 1903 m) include Battle, Slater, Savery, Willow, and Muddy creeks. Downstream of Baggs, intermittent tributaries Red Wash, Sand Creek, Sand Wash, and Powder Wash drain the Washakie Basin to the north in Wyoming and Sand Wash Basin to the south, in Colorado. After meandering between the two states, the river enters Colorado and flows approximately 160 km southwest to its confluence with the Yampa River. The specific area of interest was the lower 180 km of the Little Snake River, downstream of Baggs, Wyoming. This area represents the warmer-water reaches of the river that contain potential habitat for endangered fishes. We partitioned this area into five reaches based on geomorphology and longitudinal location. Geomorphology influences riverine characteristics such as channel morphology, water velocity, water depth, suspended sediment, and substrate and these characteristics influence distribution and abundance of aquatic invertebrates and fishes. The reaches provided a convenient method of classifying areas that may be important to the endangered fishes. Reach V: The uppermost reach extends downstream from Baggs, Wyoming at river kilometer (RK) 180 to about RK 80. Elevation changes 1 m/km from 1902 to 1798 m through the reach. The confined channel contains gravel and cobble substrates that form a riffle-pool habitat sequence. The reach contains diverse habitats year round that are apparently suitable for all life stages of fish. Riffles 5