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c <br />w <br />ABSTRACT <br />In order to obtain detailed information on the stream environments and <br />existing fish populations that may be affected by water developments of ' <br />the Rocky Mountain Power Company, nine sample stations were surveyed on <br />Sweetwater Creek and the South Fork of the White River. Stations were . <br />mapped from one to four times at different rates of discharge between <br />July 1 and ;.vovember 15, 1962. At two stations, normal flaws were di- <br />versed to side channels so as to obtain data at flaws below those -occur- <br />ring naturally. <br />Stream depths, velocities, and habitat types were measured at varying <br />rates of discharge. Fish populations were sampled by eiectrofishing. <br />Scale samples were taken for future analysis. Fishing waters were clas- <br />sified as to the landowner's policy with regard to public access. <br />Plans of the Rocky Mountain Power Company, as given in the application for <br />Federal Power Commission license (No. 2289), are sunnnarized. <br />Nearly 200 photographs showing stream characteristics at different rates <br />of discharge are on file. <br />Historic stream flow records were analyzed. Watershed conditions and ex- <br />tent of erosion are described. Effects on streamflow of an outbreak of <br />Engelmann Spruce Bark Beetle are discussed. <br />After analyzing the data concerning historic flows, seasonal fluctuations, . <br />habitat type areas, trout food production, and fish populations, prelims- .. <br />nary estimates were made of optimum stream flows at sample stations. <br />Recommendations include continuation of the stream surveys for at least <br />one additional season. <br />