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273 <br />7. Stream order. <br />8. Fish species, fish numbers, and fish lengths. <br />• Channel Materials <br />A given transect crossing the stream channel was divided into 1-foot <br />intervals, and the dominant streambed surface material determined the <br />classification of each 1-foot division (Table 2). <br />Table 2. Size Classification of Channel Materials <br />Particle Diameter Classification <br />12 inches or over (304.8 mm or over) Boulder <br />3 to 11.9 inches (76.1 to 304.7 mm) Rubble <br />0'.19 to 2.9 inches (4.7 to 76.0 mm) Gravel <br />0.18 inch and less (less than 4.7 mm) Fines (Sand) <br />Evaluations of Pools and Riffles <br />Stream areas were stratified as either pool or riffle. The pools were <br />then classified as to their suitability as a fish environment (Table 3). <br />ef__-mti__l.- <br />The conditions and type of each streambank were rated using the total <br />streamside area between each transect in accordance with Table 4. Streamside <br />types refer to habitat types at the intersection of each transect with the <br />banks. <br />Elevation of Streambed <br />Station and transect elevations were read from a hand-held "Thommen" <br />altimeter that was set each morning at an official USGS elevation marker. <br />Transects in areas mapped to 40-foot contours were checked against the <br />altimeter readings for any needed adjustment. The estimated elevation error <br />per station is within +40 feet. <br />Gradient <br />Channel gradients were recorded at each station with a hand-held clinom- <br />eter and equaled the average gradients over each entire 200-foot channel <br />section.