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Occurrence: Historical Knowledge of the historic abundance of the razorback sucker in the White River is limited. Surveys of the White River, both historic and recent, show that the razorback sucker is rare in these waters. Sigler and Miller (1963) stated that these fish are uncommon in the White River. Recent Recent survey efforts have resulted in few razorback sucker captures (Lanigan and Berry 1981, Miller et al. 1982a). Lanigan and Berry (1981) reported one hybrid razorback sucker collected 60 miles up the White River in 1979. In 1987, an adult razorback sucker was captured 18 miles upstream from the Green River (Steve Cranney, UDWR, pers. comm.). Description of Habitat: The lower 18 miles of the White River is dominated by a wide alluvial plain with a sand/silt substrate and occasional areas of exposed bedrock. There are very few riffles and no rapids or deep pools. Several side channels create eddies and backwaters (Miller et al. 1982a). Water development in the White River basin has resulted in changes to historical flows. These changes appear to be relatively minor when compared to other Basin tributaries. Taylor Draw and Rio Blanco Reservoirs are the major impoundments on the White River. These facilities act as barriers, trap sediment, and provide habitat for nonnative fishes. Relationship to Constituent Elements: Water Although extensive water development has not occurred in the White River basin, historical flow patterns have changed. The completion of Taylor Draw Dam near Rangely, Colorado altered flow and sediment transport to downstream reaches. Flows which provide seasonal habitat requirements for razorback suckers still exist. Water quality in the White River has not been discussed as a major issue. However, the concentration of oil, natural gas, and oil shale resources in the White River basin may require future study of water-quality issues. Physical Habitat The habitat characteristics of the lower White River include backwaters, side channels, and secondary channels which are common (Martinez 1986a). Principal habitat types are pool, riffles, eddies, and side channels (Miller et al. 1982a). Backwaters are an important habitat component in the lower portion of this reach; small rapids occur in the upper portion. These 55