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<br />I.)MB <br /> <br />Until recently, numerous adult razorbacks had also been captured <br />here, Walter Walker and Adobe Creek (Colorado River RM 160), are <br />controlled facilities that have been used to test hypotheses on <br />effects of selenium on razorbacks, Walter Walker is also being used <br />to test selenium remediation techniques, <br /> <br />In March 1997, levees were breached at Bonanza Bridge, The Stirrup. <br />and Old Charley Diked, All sites were used by native and endangered <br />fishes, The Bonanza Bridge site was used the most by adult <br />squawfish and razorbacks (and. of course. numerous nonnative <br />fishes), One larval razorback was found in the Bonanza Bridge site <br />and one in Old Charley Diked, <br /> <br />Preliminary results of studies on fish-food organisms suggest that <br />floodplain habitats are highly productive and provide a tremendous <br />amount of food to the river ecosystem, Water temperatures in the <br />floodplain were found to be warmer even after spring runoff had <br />subsided, <br /> <br />During October 1997, levees were breached at Horseshoe Bend. Baeser <br />Bend, and Above Brennan, During March 1998, levees will be breached <br />at Johnson and Leota, completing the 8-site block design for the <br />Green River levee removal evaluation studies. Preliminary results <br />of data collected during 1996. 1997, and 1998 will be evaluated by <br />December 1998. <br /> <br />V, Study area <br /> <br />An inventory of floodplain habitats was conducted for the upper <br />Colorado River basin during FY 93, Irving and Burdick (1995) <br />identified 293 sites consisting of 34,628 acres in 871 river miles <br />of the Green, Colorado. Gunnison, Yampa, and White rivers, <br /> <br />Due to initial emphasis on razorback sucker recovery. the Floodplain <br />Habitat Restoration Program will focus on areas within the upper <br />Colorado River basin where razorback suckers were historically <br />common to abundant (i,e" Green River (RM 0-398). Colorado River (RM <br />0-241). and Gunnison River (RM 0-75)). The Yampa and White rivers <br />will be addressed as time and money allow, Following are relative <br />priorities for floodplain habitat restoration (although the Program <br />may capita 1 i ze on opportuniti es as they ari se. even if they are not <br />highest priority): <br /> <br />9 <br />