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55 by both sexes suggested that spawning was taking place. It is known that flannelmouth suckers spawn during May and June in the Green River (McAda, 1977) and the Colorado portion of the White River (Carlson et al., 1979). Later in the summer the suckers were typically found in the relatively deep water of runs or pools. Like juveniles of other species, the young flannel- mouth typically live in more shallow, marginal waters of a river and in the White River, were readily captured in this type of habitat. Bluehead Sucker (Catostomus discobolus) The bluehead sucker is widely distributed in the Colorado River drain- age and is particularly common in the Green River drainage. Spawning prob- ably occurs in the spring and early summer at lower elevations and during mid- and late summer in colder waters (Sigler and Miller, 1963). Adults reach a length of 16 in (43 cm) but are more commonly found in the 6 in (15 cm) to 10 in (26 cm) size range (McDonald and Dotson, 1960). Fifty-one bluehead suckers, 2.5 cm to 32 cm in length, were found during this survey. Too few were found to make any observations on habitat preferences in the White River. Water Quality A cursory field survey of water quality revealed that there was little variation between stations in the upper 42 mi (67 km) of the White River irr Utah (Appendix B). Water quality during the present study was similar to that recorded by the U. S. Geological Survey (1976, 1977) and the Utah State Div- ision of Health (1978) for the previous two years (Table 6). The water quality of the White was typical of other rivers in the region in that it was relatively warm in the late summer. Daily temperatures aver- aged 16 to 23°C with a daily fluctuation of 3 to 4°C. Like other rivers in Eastern Utah, the White carried a heavy sediment load which caused high tur- bidity, hardness, conductivity and pH. It was noted that a