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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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Template:
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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<br />White River Trend Zone <br />This river reach flows through a diverse range of offstream habitats, <br />thovfl,h the subreach above the Colorado highway 6= bridge may be described <br />as heavily vegetated and the subreach below the bridge more arid. Also, <br />the longitudinal profile to a point about 500 m below the bridge consists <br />of runs and riffles or rapid flow areas (Table 2). Below this point, runs <br />and crossings, characteristic of a lower gradient, predominate. Substrates, <br />while more uniform in the downstream area, are diverse throughout the trend <br />zone, with a greater range in particle size than that seen at the other <br />trend zones. <br />Major positive habitat attributes: <br />1. Comparitively high diversity of habitat within the <br />trend zone, due to substrate and offstream diversity. <br />2. Numerous deep parabolic channel areas similar to that <br />at which two Colorado squawfish were captured in 1977. <br />These areas were associated with dense bankside vege- <br />tation, either willows or cottonwoods, and were more <br />numerous in the upper reaches of the trend zone, although <br />one such area was described at station G. <br />3. Backwater areas in the upper reaches at stations A, <br />B, and C which were formed from chute channel openings at <br />low flows. <br />Major areas of concern: <br />1. Intense winter and spring sheep and cattle grazing from <br />E to H which has caused bank slump. <br />2. Bank channelization and stabilization resulting from <br />effects of over grazing. <br />3. Channelization and stabilization near the highway. <br />Water quality impacts: <br />1. Temperature effects of low summer flows. <br />2. Salinity effects of irrigation return flows. <br />r
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