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Last modified
7/14/2009 5:02:31 PM
Creation date
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UCREFRP
UCREFRP Catalog Number
7848
Author
Burdick, B. D.
Title
Minimum Flow Recommendation For Passage Of Colorado Squawfish And Razorback Sucker In The 2.3-Mile Reach Of The Lower Gunnison River
USFW Year
1997.
USFW - Doc Type
Redlands Diversion Dam To The Colorado River Confluence.
Copyright Material
NO
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duced and naturally occurring trace elements (e.g., pesticides and selenium) <br />above the species tolerance threshold, and elimination of adult habitats. During <br />extreme low-water years, some reaches have entirely been dewatered for several <br />continuous days during summer months resulting in loss of habitat, loss of <br />migratory corridor, and possible stranding that may lead to mortality. <br />The intent of the Recovery Implementation Program (RIP) is to recover and <br />delist the endangered fishes while allowing upper basin states to develop their <br />entitled water under the Colorado River Compact. An important component of the <br />Recovery Program is the determination of flows needed for recovery of these <br />fishes. Furthermore, legal protection of sufficient instream flows for the <br />maintenance and enhancement of riverine habitats to support self-sustaining <br />populations of endangered fish is one of the primary goals of the RIP (FWS 1987). <br />Flow manipulation has detrimentally impacted these fishes but planned management <br />of flow manipulation (e.g., provision of a more naturally- shaped hydrograph) <br />would benefit native endangered fishes. <br />Planned restoration efforts for the Gunnison River have begun. A two-year <br />fishery inventory of 75 miles of warmwater reaches was conducted in 1992 and 1993 <br />that included 14 months of movement data on radiotagged adult Colorado squawfish <br />(Burdick 1995). Pond-reared razorback sucker have been stocked in the Gunnison <br />River. Twenty-five adult fish, implanted with radiotags, were stocked in 1994 <br />and 1995; 316 juvenile razorback sucker were stocked in 1995. An additional 287, <br />9-16-inch razorback sucker were stocked in October 1996 near Delta. Future <br />stocking of different sizes of juvenile and sub-adult razorback sucker during <br />1996-2000 will determine the relationship between the size stocked and their <br />subsequent survival in the wild. A fish passageway at the Redlands Diversion <br />Dam, operational since June 1996, will provide both sub-adult and adult razorback <br />sucker and Colorado squawfish access to 56 miles of historic habitat in the <br />Gunnison River. Expanding the upstream range for these two fishes in the <br />Gunnison River will assist recovery by providing additional physical habitat and <br />an abundant source of native and nonnative fishes as prey for Colorado squawfi sh. <br />The warmwater reaches of the Gunnison River are historical habitat for the <br />four endangered fishes in the Upper Colorado River Basin. Historically, humpback <br />chub were not collected from the Gunnison River until one specimen was captured <br />in 1993 (Burdick 1995); the nearest known population of humpback chub is located <br />at Black Rocks in Ruby Canyon on the Colorado River 38 miles downstream from the <br />Redlands Diversion Dam. Other fishery studies conducted over the past 15 years <br />indicate that Colorado squawfish occupy both up- and downstream reaches from the <br />Redlands Diversion Dam (Valdez et al. 1982b; Wick et al. 1985; Burdick 1995). <br />No wi 1 d ri veri ne razorback sucker have been col 1 ected i n the Gunnison Ri ver si nce <br />1981 (Holden et al. 1981). <br />The population of Colorado squawfish in the Lower Gunnison River between <br />the Redlands Diversion Dam (river mile [RM] 3.0) and the confluence with the <br />Colorado River (RM 0.7)2 is contiguous with the Upper Colorado River population. <br />2 Prior to the flood years of 1983 and 1984, the confluence of the Gunnison and Colorado rivers was 0.0. During these <br />flood years, the Colorado River claimed 0.7 mile of a former side channel of the Gunnison River. Therefore, after <br />1984, the new confluence designation was 0.7 rather than 0.0. <br />4
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