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reach by both species occurred in the past and may still occur on a limited or infrequent basis <br />(McAda and Kaeding 1991; Osmundson and Kaeding 1989). Management of the reach should <br />include consideration of its value as potential spawning habitat. The focus of this report is on flow <br />effects on adult Colorado squawfish summer and winter habitats in the reach. Flow effects on <br />summer and winter habitats of razorback sucker is not emphasized in this report because all habitat <br />use data outside the spring spawning season were collected from the 18-mile reach. <br />Although this report primarily focuses on physical habitat for adults of the target species, we <br />recognize that flow also affects other organisms within the river community which in turn have a <br />direct effect on the well-being of the endangered fishes. Flow interaction with food availability <br />dynamics is currently being investigated in a separate study. Other relevant studies not yet <br />complete include research conducted by geomorphologists from the University of Colorado which <br />will determine threshold flows necessary for transport of sediment in the 15-mile reach, a subject <br />addressed later in this report. Also, a study aimed at identifying bottomlands that could be <br />reconnected to the river via a combination of flows and removal of levees is currently being <br />conducted by the USFWS. It and studies by Van Steeter and Pitlick (University of Colorado) will <br />identify the magnitude and frequency of spring flows necessary to sufficiently inundate floodplain <br />sites and thereby provide important razorback sucker spawning and nursery habitat. Results from <br />these and other studies will later need to be integrated with results presented in this report.