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4 (Ptvchocheilus lucius) and the humpback chub (Gila c ha), enhance the importance of potential habitat changes from watershed development. A humpback chub was collected near Bonanza, Utah (Sigler and Miller, 1963). There are unsubstantiated reports of squawfish being caught on hook and linein the 1940's from the White River at the bridge near Bonanza (Seethaler, 1978). Several adult squawfish were observed or collected in the upper White River in Colorado in the late 1960's (Everhart and May, 1973; May, 1970) and in 1977 (Prewitt et al., 1978). The occurrence of both species in the Green River near the White River confluence has been well documented (Holden and Stalnaker, 1975a; Seethaler, 1978; Holden, 1968, 1973; McAda et al., 1977; Stalnaker and Holden, 1973). Also, individuals of two other endemic Colorado River fish species which are proposed additions to the threatened and endangered species list, the humpback sucker (Xyrauchen texanus) as threatened and the bonytail chub (Gila ele ans) as endangered, have been captured in the Green River near the White River confluence (Vanicek 1967; Holden and Stalnaker, 1975a; McAda, 1977). In 1974-75, the BLM funded a fisheries inventory in the Utah portion of the White River. About 1500 fish were examined, but no rare fish were found (Crosby, 1975). Although the White River is not proposed as critical habitat for either the Colorado squawfish or the humpback chub, they may at times utilize the river. The river has ben classified "Value Class I: Highest-valued fishery resource" by the U. S. Fish and Wildlife Service (FWS) based on occurrence of endangered species cited above (U. S. Fish and Wildlife Service, 1978). On the otherhand, the river is classified as Class 4 by the State of Utah in its Utah Fishing Waters and Classification System which is based on a stream's recreational fishing value. Because of the lack of definitive infor- mation on the endemic fish in the White River, their status in the river and the importance of the White River to the fishes of the Green River Basin is generally unknown.