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<br />oc... <br /> <br />COLORADO RIVER RECOVERY PROGRAM <br />FY-1996 PROPOSED SCOPE OF WORK <br /> <br />Proj ect No.: <br /> <br />Lead Agency: <br />Submitted by: <br />Address: <br /> <br />Phone: <br />FAX: <br />E-Mail : <br /> <br />U.S. Fish and Wildlife Service <br />Timothy Modde and David Irving <br />266 West 100 North, Suite 2 <br />Vernal, Utah 84078 <br />801-789-0354 <br />801-789-4805 <br />R6FFA VER@FWS.GOV <br /> <br />CateQorv (check one): <br />-X_ Ongoing project <br />Ongoing-revised project <br />--- Requested new start <br />_X Capital improvement <br /> <br />Date: March 1, 1996 <br /> <br />I. Title of Proposal: <br /> <br />Use of Old Charlie Wash as a controlled facility for testing <br />hypotheses on floodplain habitat and restoration of razorback <br />suckers. <br /> <br />II. Relationship to RIPRAP: <br /> <br />-GREEN RIVER ACTION PLAN: MAINSTEM <br />ACTIVITY II. RESTORE HABITAT <br />II.A. Restore and manage flooded bottomland habitat. <br /> <br />III. Study Background/Rationale and Hypotheses <br /> <br />Historically, upper Colorado River basin floodplains were inundated <br />each year by spring runoff, but today much of the river is <br />channelized by levees, dikes, rip-rap, and tamarisk. The lack of <br />access to bottomlands has been exacerbated by the reduction in <br />spring flows due to upstream impoundments. Numerous studies have <br />suggested the importance of seasonal flooding to river productivity. <br />Because these areas are more productive and are warmer than main <br />channel habitats, flooded bottomlands are believed to be important <br />rearing sites for underyearling native fishes, and may represent a <br />key factor in restoring recruitment among razorback suckers. <br /> <br />Old Charlie Wash is a floodplain depression that has been restored <br />for testing hypotheses on floodplain habitat and razorback <br />restoration. Following are the major questions: <br /> <br />1. Will endangered fishes (razorbacks and squawfish) passively <br />drift into (e.g., larvae) or actively seek (e.g., adults) <br />floodplain depressions, like Old Charlie? <br />2. Will endangered fishes (razorbacks and squawfish) benefit <br />(e.g., survive and grow) by using floodplain depressions like <br />Old Charlie? <br />3. Can floodplain depressions be managed in such a way as to <br />prevent exacerbation of nonnative fish problems? <br />