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There was a 304.8-m change in elevation, an average gradient of about 2%, <br />within the sampling area. Sampling at Site Y1 was discontinued at the end of <br />October 1975 because the site was being channelized. Site Y5 was added in <br />November 1975 as an additional downstream site. <br />One site (WF1) was established on the Williams Fork River, a major <br />tributary of the Yampa River. Site WF1 was situated immediately below a coal <br />mine to determine community types in a heavily-silted area. Sampling was <br />discontinued at WF1 in July 1976 because of extensive bulldozing in the area. <br />An 88.5-km reach of the White River from Meeker to Rangely was <br />sampled at four sites, W1A and W1-W3 (Figure 4, Table 8). At all sites below <br />Meeker, the substrate contained considerable silt, and the water was never <br />completely clear at any time of the year. All sites on the Yampa River <br />experienced periods of clear water during low flow. <br />Generally, riparian vegetation at the upper stations on the 4~Jhite <br />and Yampa Rivers consisted of willows and cottonwoods; the lower sites were <br />bordered by sagebrush, saltbrush, rabbitbrush and some willows. There was a <br />greater percentage of rubble and pebble substrates at higher elevations and <br />a greater percentage of silt and sand at sites at lower elevations. <br />Habitat assessment <br />Detailed dimensional measurements were made with surveying and <br />stream-flow-determination e~ <br />River bridge on county road <br />fish-sampling Station Y-3); <br />Y-4); 3) above the Piceance <br />ing to Station W-A); and 4) <br />10 km below Station W-A). <br />auipment 1} directly above and below the Yampa <br />25 north of Maybell, Colorado (corresponding to <br />2) near Lily, Colorado (corresponding to Station <br />Creek confluence with the White River (correspond- <br />near the Rio Blanco County road 65 bridge (about <br />32 <br />