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• Table 4 Descriptions of eight major habitat types Habitat Description _ Main channel Primary river course that carries the mayor water flow throughout most of the year. Backwater A body of water off the main channel with no measur- able velocity; often created by an eddy or drop in water level which partially isolates a former side channel or low-lying area. Side channel A side channel which carries appreciable flow during high water and provides a low velocity habitat during low flow. Eddy A portion of the stream deeper than the adjacent channel with a distinct whirlpool effect. Pool A portion of the stream that is deep and quiet relative to the main current. Riffle A shallow, fast-flowing area where the water surface is broken into waves by obstructions wholly or partly submerged. Run A stretch of relatively deep, fast, laminar flow with the surface essentially nonturbulent. Shoreline The shallow, low-to-negligible velocity waters next to shore. An effort was made to collect fish from every habitat present in a sample station. The habitat where each fish was collected was described from a series of depth, velocity, and substrate measurements. • Bottom substrates were classified according to the following scheme: Silt Fine gritty material Sand Less than 3 millimeters (mm) diameter Gravel 3 mm to 76 mm Rubble 76 mm to 305 mm Boulder 305 mm and larger Bedrock Rock outcropping The 4.5-mile (7.2-kilometer) reach between stations was sampled in a more general manner, primarily by electrofishing, in order to provide a survey of adult fishes. Physical data were collected only at sites of rare fish captures. Each habitat present in the standardized sampling station was sampled with every effective gear type. Rare fish captures were located on river maps to the nearest 0.1-mile (1.6-kilometer) and water depth, velocity measurements, and the predominant substrate type recorded. All fish collections were accompanied with detailed information regarding location, date, time of day, measure of effort, habitat type, substrate type, and a series of depth and velocity measurements. Fish larger than 100 measured individually. I • 10 millimeter groups and fish that succumbed and examinations. All rare millimeters total length (TL) were weighed and ,arge samples of smaller fish were sorted into counted. Stomachs were removed from the rare the rest of the carcass preserved for later fishes greater than 200 millimeters TL were 11