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Last modified
7/14/2009 5:02:29 PM
Creation date
5/20/2009 9:51:39 AM
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UCREFRP
UCREFRP Catalog Number
7273
Author
Prewitt, C. G., E. J. Wick and D. E. Snyder.
Title
Population and Habitat Monitoring Program for the Endangered Humpback Chub (
USFW Year
1978.
Copyright Material
NO
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12. <br />2. Bank destabilizations on right bank due to overgrazing <br />and defoliation by farmers. <br />3. Critically shallow passage areas (noted on maps). <br />4. Offstream gravel mining near Oldham Bottom and possi- <br />bility of destabilization. <br />Water quality impacts: <br />1. Sewage and irrigation return flow, high temperatures <br />and low dissolved 02 associated with low summer flows. <br />Water quantity impacts: <br />1. Farmer's canal, Plateau Creek and headwaters diversions. <br />Proposed dam near DeBeque, Colorado. <br />Land-use impacts: <br />1. Increased gravel-mining, irrigation. <br />2. Urban growth in the Palisade-Clifton area. <br />Gunnison River Trend Zone <br />This river reach begins at the lower limits of a broad plain bounded by <br />areas of low relief to the west. The left bank adjoins an active gravel <br />mining area for approximately 1.5 river km, with gravel dumps forming the <br />actual channel boundary in this area. The river then enters a narrow canyon <br />whose walls rise 75 to 100 m above the river surface. Within the canyon are <br />five major deep-water areas (Table 4) at 1.5 to 2 km intervals, separated by <br />run:riffle sequences. The impoundment at Redlands Diversion Dam has raised the <br />lower reach base level apprixmately 3.5 to 4.5 m causing a reduction in stream <br />gradient from 0.00264 in the upper canyon reaches to 0.00162 in the final <br />2.8 river miles of the trend zone. <br />Major positive habitat attributes: <br />1. Numerous deep-water and boulder-strewn areas from station <br />A through station F. <br />2. Remote location and lack of bankside population or land- <br />use influences.
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