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noted. Details are presented later in this report. Distribution and numbers of selected mayfly species were emphasized. Prewitt (1977) analyzed distribution, meristics, morphometrics, and isoenzymes of the catostomid fishes of the White River. Neither white suckers nor their hybrids with native suckers occurred in the White River. Flannelmouth and bluehead suckers were common at all stations on the White River; flannelmouth x bluehead hybrids were rare, Hybrid suckers were considered nonreproductive. Prewitt, Wick and Snyder (1978) discussed populations and habitat of humpback chubs and Colorado squawfish in a White River reach which corresponded to part of our fish collection area and extended from Rio Blanco Lake to the County Road 65 bridge in Rio Blanco County. Their 1977 collections at eight stations on the White River are summarized in Table 1, McKean and Burkhard (1978) described the aquatic resources in the area of the Yellow Jacket Project, a flow-regulation project involving the North Fork and several other tributaries of the White River. Field re- search was concentrated on the White River and its tributaries above Meeker. The history of the fishery and recreational use of fishery resources were considered. Fish populations were inventoried by electrofishing in 1975 and 1976. Fishes encountered in the White River drainage were mountain white- fish, rainbow trout, cutthroat trout, rainbow x cutthroat hybrids, brown trout, brook trout, bluehead sucker, mountain sucker, flannelmouth sucker, mottled sculpin, speckled dace, roundtail chub and redside shiner (Richardsonius balteatus). The latter unexpected species may have been related to the erroneous report of redside shiners in the White River in our December, 1975, progress report. Other species reported in our progress reports and by May (1970) were added to their list of species present. It 9