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6 <br />point of entry (river mile 201) with the river constricted between <br />narrow walls. This large river gradually slowed and widened near <br />Gypsum and Palmer Canyons (river mile 196). Large side eddies were <br />common in the mixing zone near Gypsum Canyon during 1980. Water was <br />9-11 m deep in the main channel, but was more shallow near the recently <br />innundated talus slope shoreline. The reservoir reached maximum <br />elevation (1,128 m) for the first time during 1980. <br />Reservoir level was approximately 1,122 m and river flow averaged <br />less than 311 m3/sec (11,000 cfs) during the 1981 sampling period. <br />As a result of lower reservoir elevation and lower river flow the <br />mixing zone was greatly altered. Mud and silt bars formed during 1980 <br />were exposed in 1981, the channel was narrower and shallower (3-5 m), <br />current velocity was greatly reduced, and there were fewer and smaller <br />side eddies during 1981 than 1980 (Figure 3).