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. DRAFT . is the ongoing Colorado River Fisheries Project (CRFP) being conducted by the u.s. Fish and Wildlife Service (FWS). . Much of the work done by FWS has served to provide information for the evaluation of water development impacts, as prescribed by Section 7 of the Endangered Species Act. On such evaluation is the operation of Flaming Gorge Dam on the upper Green River in northeastern utah. The BOR has been in consultation with FWS on the operation of this facility as information on the needs of the fishes is accumulated. . Results of studies by CRFP have indicated that the operation of Flaming Gorge Dam may, at certain times of the year, affect the reproduction and recruitment of the endangered or native fishes in the Green River System. In satisfying the requirements of Section 7, FWS and BOR have entered into an Interagency Agreement to collect biological and physical information on the endangered fishes that is specific to the operation of Flaming Gorge Dam. The objective of these studies is to obtain information to enable FWS to recommend operational criteria for Flaming Gorge Dam that will insure the continued survival and promote the recovery of these species. . Prior to the investigation described in this document, information on the flow needs of these fishes had been collected only in the spring, summer and fall. No data had been collected on flow needs and migrational or movement patterns during the winter. This information is needed to complete the recommended operational criteria for Flaming Gorge Dam. As in the summer months, the operation of the dam in the winter may also affect the survival and recovery of the species. . . The purpose of this investigation is to characterize the winter habitat needs of adult Colorado squawfish and razorback suckers through the use of radiotelemetry and the Instream Flow Incremental Methodology (IFIM). The humpback chub and bony tail chub are not included in this study. The bony tail is extremely rare in the upper Colorado River basin, to the extent that information on this species cannot be readily collected. The humpback chub has been excluded because the species is non-migratory and restricted to canyon habi tats that may not be as greatly affected by flow changes as are other riverine habitats. This investigation was conducted during two continuous winters; year 1 was the winter of 1986-87 and year 2 was the winter of 1987- 88. . . . 2 .