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700 <br />600 ------------------------- <br />500 ------------------------- <br />c <br />a) <br />F°- 400 <br />300 <br />7 6 5 <br />Q <br />15-mile reach Down <br />Figure 4. Mean size, by river strata, of Colorado sc <br />electrofishing and trammel netting. Error bars repri <br />Canyon, was not sampled. The lower end of Strata <br />However, considering that prime adult habitat is rest <br />best habitat and greatest concentrations of adults loc <br />true importance of the 15-mile reach begins to come <br />Recognizing the importance of the 15-mile reach, the <br />position that the quality and quantity of habitat there i <br />populations of these imperiled fish are to be maintain( <br />this particular reach of river has been subjected to ma <br />of the century. In addition to losses arising from loca <br />as well as reaches downstream, have diminished becai <br />headwaters on the western slope to the metropolitan, permanent net loss of water from the Colorado River <br /> <br />4 3 2 1 <br />rata <br />ish captured during 1991-1992 using <br />+/- 1.96 (SE). Strata No. 4, Westwater <br />1 is the Green River confluence. <br />i to the upper 60 miles of river, with the <br />in the 33-mile-long Grand Valley, the <br />focus. <br />J.S. Fish and Wildlife Service has taken the <br />lust be preserved if Colorado River <br />i and hopefully recovered. Unfortunately, <br />)r water withdrawals beginning at the turn <br />irrigation needs, flows in the 15-mile reach, <br />se of transbasin diversions from the <br />-eas of Colorado's east slope, i.e., a <br />lrainaRe. The likelihood of additional, <br />6