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WSP08365
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Last modified
1/26/2010 2:47:53 PM
Creation date
10/12/2006 2:57:18 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8200.760
Description
Yampa River General
State
CO
Basin
Yampa/White
Water Division
6
Date
3/24/1994
Author
Hydroshpere
Title
Elkhead Biological Assessment - Second Draft - March 24 1994
Water Supply Pro - Doc Type
Report/Study
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<br />, <br />ODD31~ <br /> <br />There are no reports of squawfish occurring within the Elkhead Reservoir area or the 4- <br />mile section of Elkhead Creek downstream of the reservoir. Adult Colorado squawfish have <br />been captured in the lower 124 miles of the Yampa River, and larvae have been found in the <br />lower 19 miles of the Yampa River in Dinosaur National Monument (Miller et. al. 1982; Wick <br />et. al. 1986; Tyus and Haines 1991). Young, juvenile, and adult squawfish have been <br />collected in the Green River from the mouth of the Yampa River to its confluence with the <br />Colorado River (Maddux et. al. 1993a). Critical habitat has been proposed for the Colorado <br />squawfish in areas downstream of Elkhead Reservoir, including the Yampa River from River <br />Mile 137.7 to its confluence with the Green River, the Green River between its confluences <br />with the Yampa and Colorado Rivers, and the Colorado River from the Green River confluence <br />to Lake Powell (Maddux et. al. 1993b). <br /> <br />Humpback Chub (Gila cypha) <br /> <br />The Humpback chub was listed as an endangered species in 1973 by the U.S. Fish and <br />Wildlife Service. Humpback chub are generally found inhabiting deep water in narrow canyon <br />areas, are relatively limited in distribution, and seldom leave their canyon habitat. They have <br />occasionally been captured in the lower Yampa River in Juniper and Cross Mountain canyons. <br />Humpback chub have also been captured in Desolation and Gray canyons of the Green River <br />and in the Yampa and Whirlpool Canyons in Dinosaur National Monument (Maddux et. al. <br />1993b). <br /> <br />During the spring and summer, Humpback chub are most prevalent in high gradient, <br />whitewater reaches dominated by rocky runs, riffles and rapids (U.S. Fish and Wildlife. <br />Service, 1992), Adult fish are most often captured in seasonalIy flooded shoreline eddies that <br />are downstream of large boulders and upstream of rapids. Fall and winter habitat <br />requirements of Humpback chub are less well understood, however research indicates that the <br />fish remain in pools and eddies during these periods of lower flows (Karp and Tyus, 1990). <br /> <br />Proposed critical habitat in the Yampa and Green Rivers includes the Yampa River from <br />Dinosaur National Monument to the confluence with the Green River and the Green River <br />from the confluence with the Yampa River to the southern boundary of Dinosaur National <br />Monument (Maddux et. al. 1993b). No humpback chub have been observed in the EIkhead <br />Reservoir area or in Elkhead Creek below the reservoir. <br /> <br />Razorback Sucker (Xyrauchen texanus) <br /> <br />The R;Izorback sucker was listed as endangered in 1991 by the U. S. Fish and Wildlife <br />Service. There have been very few recorded captures of Razorback suckers in recent years. <br />This is believed to be a result of either reproductive failure, predation on eggs and young-of- <br />the-year fish by other species, and competition with exotic fish species for food and habitat. <br /> <br />During the winter months, Razorback suckers use slow runs, sIackwaters, eddies and <br />backwaters in the Green River, where local movements increased with flow fluctuations <br />(Valdez and Masslich, 1989), Breeding Razorback suckers have been found on <br />cobble/gravel/sand bars in the lower Yampa and Green rivers (Tyus and Karp, 1989). <br />Spawning has been observed during ascending and highest spring peak flows (Tyus and Karp, <br />1989). Razorback suckers exhibit both local and long-distance spring and summer movements <br />(Tyus, 1987). Spawning migrations have been detected between the lower Yampa River and <br />the Upper Green River. <br /> <br />The Iargest existing riverine population of razorback sucker, an estimated 1,000 fish, <br />occurs in the Green River from the mouth of the Duchesne River upstream to the Yampa River <br /> <br />10 <br />
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