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habitats, especially at Old Charley Wash. However, legal protection for these flows must <br />now be obtained to ensure the passage of this water through the reach to reach target areas. <br />Selenium concentrations and interactions with nonnative fishes are other issues which need to <br />addressed for recovery in this reach. <br />Green River - Sand Wash to Confluence with the Colorado River <br />Boundary Delineation: Utah, Uintah, Carbon, Grand, Emery, Wayne, and San Juan <br />Counties. The Green River and its 100-year floodplain from Sand Wash at RM 96 at <br />T.11S., R. 18E., section 20 (6th Principal Meridian) to the confluence with the Colorado <br />River in T. 30S., R. 19E., section 7 (6th Principal Meridian). <br />Shoreline Ownership: Bureau of Land Management, 46.6 percent; National Park Service, <br />27.9 percent; Tribal, 12.6 percent; Private, 12.1 percent; State 0.8 percent. <br />Overlap with Proposed Critical Habitat for: Colorado squawfish, humpback chub, <br />bonytail. <br />Occurrence: <br />Historical <br />Historic distribution of the razorback sucker in this reach of the river was first documented <br />by Jordan (1891). Smith (1959) stated that razorback suckers were "common in the lower <br />part" of the river (in Bestgen 1990). Other than these accounts, little is known about the <br />historical occurrence of the razorback sucker in this reach of the Green River. <br />Recent <br />In more recent years, Tyus et al. (1987) reported finding only seven razorback suckers in <br />this stretch of the river. Two of these fish were in reproductive condition when captured in <br />Labyrinth Canyon (Tyus 1987). Razorback suckers have also been caught near the mouth of <br />the San Rafael River (Miles Moretti, UDWR, pers. comm.). <br />Description of Habitat: <br />A maximum flow of 68,000 cfs was recorded at Green River, Utah in 1917 and a minimum <br />flow of 255 cfs in 1931. Predam temperatures at Jensen, Utah, ranged from near 32°F in <br />December and January to around 70°F during July and August (Smith and Green 1991). <br />Below Sand Wash, the Green River enters Desolation Canyon, a wide canyon with nearly 50 <br />riffles and rapids. Rapids gradually increase in size as the river travels through the canyon. <br />Habitats in this stratum include eddies, riffles, rapids, and some deep pools. Boulder cobble <br />and sand make up the primary substrates within Desolation Canyon. This canyon is followed <br />52