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WSP04713
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Last modified
1/26/2010 2:15:17 PM
Creation date
10/12/2006 12:32:29 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8240.200.48.D.3
Description
Wolford Mountain
State
CO
Basin
Colorado Mainstem
Water Division
5
Date
2/7/1990
Title
Wolford Mountain Biological Opinion - (Muddy Creek)
Water Supply Pro - Doc Type
Publication
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<br />. <br /> <br />-, <br /> <br />9 <br /> <br />maintain llin... now conditions in the reach upstream from the Grand Valley <br />Irrigation Cllfany facility; however, near-dry conditions have occurred in the <br />Colorado River~tream from the Grand Valley Irrigation Company diversion <br />during l~ ~rs. Nearly dewatered conditions occur when flows <br />immediately ~ Ue Grand Valley Irrigation Company diversion, including the <br />.checked back" water of the Government Highline Diversion are approximately the <br />same or less tlan tile Grand Valley Irrigation Company's water right of 640 cfs. <br />Most of the tile. these low flows occur in late July, August, and early <br />September. III~ter years, the result is a near-dry streambed condition for <br />a short reacllllithin known occupied habitat for Colorado sQuawfish. The river <br />slowly recovers frOD this nearly dewatered state through ground water accretions <br />and small irrigltiCII return flows, amounting to approximately 50 cfs within <br />2 miles of tlIelliYersion. Five miles below the diversion, flows increase to <br />200 cfs and, jlISt above the confl uence of the Gunni son River <15 mil es <br />downstreaJl), flclts reach 300-350 cfs (Bureau of Reclamation 1980). <br /> <br />Depletions maltlng from the Muddy Creek. project will result in some alteration <br />of physical ~itat in occupied areas of the Colorado River below the confluence <br />of the Gumi_ River. The specific habitat impacts that would occur in this <br />reach of the~onMb River from such a reduction are unQuantified at this time, <br />although the _letion of water will contribute to an additive loss of habitat <br />below the Gumison River. We believe that the flows contributed by the Gunnison <br />River and otller trillutaries will prevent habitat and flow conditions as critical <br />as those fouId in tile 15-mile reach. Therefore, for the purposes of this <br />opinion, iIIliI1JSis of the water depletion impacts on Colorado sQuawfish habitat <br />resulting frODtIIe IIddy Creel< project will concentrate on the IS-mile reach <br />above the (0IIflIenCe of the Gunni son River. <br /> <br />Colorado SlluaIIish Activitv in the IS-mile Reach <br /> <br />Migration <br /> <br />Radiotel~tbH6es show upstream and downstream movement of adult Colorado <br />sQuawfish ill me .ilstem Colorado River. The most dramatic movement was <br />exhibited by fi5II u.lanted with a radio transmitter at Gypsum Canyon in upper <br />lak.e Powell_1pri1 5, 1982. The fish was contacted next in the lower Cataract <br />Canyon area _ .17', 1982. The next contact was made above the Bl acl< Rock.s <br />area of R~~ some 160 miles upstream. The movement was accompliShed in <br />41 days and is ~1iewed to be related to spawni ng. At the end of September <br />1982, this fishas located on the Colorado River in the vicinity of Clifton, <br />Colorado (rilluile 178), nearly 200 river miles from its furthest documented <br />downstreillllllClliol. <br /> <br />Other radi~ fish in the Colorado River have not displayed such dramatic <br />migratory '1' ~. Radiotelemetry studies conducted by the Colorado River <br />Fishery Projed (Fi!"!ry Project) from 1982-B5 (Miller 1982, Archer et al. <br />1986), whidl ~ on upstream reaches of the Colorado River in and around the <br />
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