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<br />UM6 <br /> <br />developing, experimental designs to test the hypotheses, and <br />implementing work plans that are consistent with the experimental <br />design, <br /> <br />End Products: <br /> <br />Functional floodplain habitats of sufficient quantity, quality, and <br />spatial distribution to support the survival, growth. recruitment, <br />and reproduction (i ,e" recovery) of the endangered fishes, <br /> <br />IV, Description of past performance on this or similar projects: <br /> <br />In 1991. Ed Wick developed a draft issue paper entitled "River <br />Management and Habitat Restoration Strategy", which recommended <br />restoration of floodplain habitats for use by endangered fishes, <br />One specific recommendation was to reconnect Old Charley Wash <br />(Wood's Bottom) to the Green River for use by endangered fishes, <br />Old Charley Wash became a pilot site for testing hypotheses <br />regarding floodplain habitat restoration. To prepare the site, <br />water inlet and outlet control structures, fish screens. and a fish <br />harvest kettle were installed, The site was tested during 1994. <br />1995, and 1996, to see if water levels and fish predators can be <br />controlled. and if razorback larvae will survive and grow, During <br />1995 and 1996. spring flows overtopped the levees, allowing access <br />by fishes of all sizes and species, Although nonnative fishes <br />greatly out~numbered-native fishes in Old Charley, 28 young <br />razorbacks managed to survive in 1995: 45 in 1996, This many <br />razorback larvae surviving to become juveniles in the presence of <br />large numbers of nonnative fishes is considered significant, In <br />addition. Old Charley was used by 10 adult razorbacks and 14 <br />juvenile squawfish during 1995-96, <br /> <br />The Gravel Pit at 29 5/8 Road was connected to the Colorado River <br />(RM 174) in December 1995, Although all fishes had been removed, <br />nonnatives quickly recolonized the site after connection, as <br />expected, Native fish use of the site varied seasonally. with <br />highest use during spring runoff (39% native fishes. including 7 <br />adult squawfish); lowest use post-runoff, During 1998, the site <br />will be reconfigured so that fishes have access only during spring <br />runoff, <br /> <br />Walter Walker (Colorado River RM 164) 'has been and continues to be a <br />high-use area by adult Colorado squawfish, especially during runoff, <br /> <br />8 <br />