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Last modified
7/14/2009 5:02:34 PM
Creation date
5/22/2009 4:43:58 PM
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UCREFRP
UCREFRP Catalog Number
9350
Author
Hawkins, J., T. Modde and J. Bundy.
Title
Ichthyogauna of the Little Snake River, Colorado, 1995 with Notes on Movements of Humpback Chub.
USFW Year
2001.
USFW - Doc Type
Denver.
Copyright Material
NO
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<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 />RESULTS <br /> <br />Discharge, water temperature, and water quality <br /> <br />During the 1995 water year, annual runoff volume in the Little Snake River <br />was 617,500 acre feet lCrowfoot et al. 1996). Winter baseflow prior to runoff <br />was 2 to 3 m3/sec from October through January. Runoff peaked at 165 m3/sec <br />on June 8 and decreased rapidly to a base flow that ranged from 1 to 2 m3/sec <br />from early-August through September (Figure 2). Localized rain events in <br />September caused three spates that temporarily increased discharge from base flow <br />to about 4 m3/sec and another spate that increased discharge to 13 m3/sec. <br /> <br />Water temperatures were probably influenced by water volume, ambient <br />temperature, and size and morphology of the river channel upstream. Daily water <br />temperatures was calculated as the arithmetic mean of 24, hourly temperatures. In <br />both the Little Snake and Yampa rivers, daily temperatures generally followed a <br />similar pattern of warming from May through August during runoff and baseflow, <br />followed by cooling in late September (Figure 3). Daily temperatures were similar <br />for both rivers during the last two weeks of May, but in June and July, daily <br />temperatures in the Little Snake River were warmer than those in the Yampa River. <br />In June, mean daily water temperature in the Little Snake River was 14 Oc <br />Is = 1 .9477) and one degree warmer than temperatures in the Yampa River <br />(x = 13 oc, s = 1.5201) and in July, the Little Snake River (x = 19 oc, 5 = 1.8141) <br />was two degrees warmer than the Yampa River (x = 17.2 oc, s = 2.1442). By <br />August, this rel~tionship reversed and the Little Snake River (x = 19.8 oc, <br />5=0.7176) was two degrees cooler than the Yampa River (x = 21.40C, <br />s = 1 .0928). The Little Snake River remained about two degrees cooler (x = 14.8 <br />oc, s = 3.1443) than the Yampa River Ix = 16.7 oc, s = 3.6399) through <br /> <br />9 <br />
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