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Historic or Present Distribution <br />This reach is known historical and current razorback sucker habitat. Historical accounts <br />(Quartarone 1993) and recent research (Lanigan and Tyus 1989) indicate little change in <br />razorback sucker distribution in the Yampa River. <br />Maintenance of Rangewide Distribution <br />The Yampa River is or is near the northern range of occupied razorback sucker habitat. <br />However, razorback sucker once ranged upstream in the Green River to Wyoming (Simon <br />1946). <br />Special Management <br />Yampa River flows are considered to be adequate for the razorbacks requirements at this <br />time. Efforts will need to be made to maintain a relatively unmodified hydrograph in the <br />Yampa River. The problems associated with nonnative fish predation and competition will <br />need to be addressed. <br />Green River - Confluence with the Yampa to Sand Wash <br />Boundary Delineation: Utah, Uintah County; and Colorado, Moffat County. The Green <br />River and its 100-year floodplain from the confluence with the Yampa River in T.7N., <br />R. 103W., section 28 (6th Principal Meridian) to Sand Wash at RM 96 in T.11S., R. 18E., <br />section 20 (6th Principal Meridian). <br />Overlap with Proposed Critical Habitat for: Colorado squawfish, humpback chub, <br />bonytail. <br />Shoreline Ownership: Bureau of Land Management, 31.7 percent; National Park Service, <br />24.7 percent; Private, 27.8 percent; Fish and Wildlife Service, 8.4 percent; Tribal, 5.4 <br />percent; State, 2.1 percent. <br />Occurrence: <br />Historical <br />Jordan (1891), reported that razorback sucker were very abundant at Green River, Utah, <br />Collections in the Green River just prior to and after construction of Flaming Gorge Dam <br />confirmed the presence of razorback sucker (Binns et al. 1964; Banks 1964). <br />48