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<br />-4- <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />All macroinvertebrate samples were taken from similar habitats; cobble, <br />riffle areas. <br />Fishes were sampled at Lodore, Alcove Brook, Echo Park (mouth of <br />Yampa River), Is 1 and Park, and Jens en in the Green River and at Lower <br />Yampa and Lily Park in the Yampa River (Figure 1). A general descrip- <br />tion of each of these sites follows; sketches of the stations are in <br />Appendix I. <br />Lodore (46 MBD) <br />The river at this point is rather slow. Bottom substrate is <br />almost 100% sand. At low flows the river is braided with many <br />sand bar islands; at high flows it is bounded by high banks. <br />Habitats are not very di verse; runs are predomi nant, wi th few <br />eddi es and backwaters. Duri ng hi gh flows, the backwaters are <br />washed out. Considerable daily fluctuation due to Flaming <br />Gorge releases occurs at this station. The station is 1.2 <br />mil es long. <br />Alcove Brook (61 MBD) <br />This station, in the lower portion of Lodore Canyon, exhibits a <br />vari ety of habitat types. The substrate is approximate ly 75% <br />cobb 1 e-rubb 1 e and 25% sand. Poo 1 sand riffl es are common. At <br />low flows, cobble bars become exposed. Banks are often steep <br />rock cliffs. Backwaters are relatively scarce. Considerable <br />daily fluctuations due to Flaming Gorge release occurs at this <br />station. The station is 1.0 miles long. <br />