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<br /> <br />OUt.;)l;~ <br /> <br />riffles. Annual variability in stream temperatures in this reach of the Yampa <br />River ranges from 00 to 200C (Celsius) (T. D. Steele, D. P. Bauer, D. A. <br />Wentz, and J. W. Warner, written commun., 1977). Minimum water temperatures <br />generally occur in February and maximum temperatures in August. During the <br />winter months, parts of the study reach may be completely covered with ice. <br /> <br />The locations of the sampling sites used for the modeling analysis of the <br />study reach are shown on figure 6. Seventeen tributaries discharge into the <br />Yampa River in this reach (fig. 6). Major tributaries include the Elk River, <br />Trout Creek, and Walton Creek. In 1975, it was estimated that 8,000 people <br />lived along the study reach, principally in the Steamboat Springs and Hayden <br />areas (Gathers and Associates, Inc., 1976). Effluent discharges from <br />municipal wastewater-treatment plants comprise the major source of organic <br />pollution to the Yampa River in the study reach. A 'summary of the existing <br />point-source discharges from wastewater-treatment plants in the study reach is <br />presented in table 1. Until late 1975, a 180-MW (megawatt) powerplant <br />upstream from the town of Hayden (fig. 6) discharged heated water into Sage <br />Creek, a tributary to the Yampa River. During 1976, a second unit generating <br />250 MW was added to the powerplant. At about that time, a cooling-tower and <br />evaporation-pond type of system was installed to dispose of the heated water <br />resulting from the operation of the entire powerplant. No thermally heated <br />waters are now being discharged into Sage Creek from the powerplant. <br /> <br />Table 1.--Existing point-source discharges from wastewater-treatment pZants <br /> <br />Reference <br />codel <br /> <br />Source <br /> <br />System type <br /> <br />YE-l----- <br /> <br />Mount Werner <br /> <br />Aerated lagoon <br /> <br />yE-3----- <br /> <br />Town of <br />Steamboat <br />Springs <br /> <br />Aerated lagoon <br /> <br />yE-4----- KOA Package plant <br />yE-5----- Sleepy Bear Package plant <br />yE-6----- Steamboat II Package plant <br />yE-7----- Town of Aerated lagoon <br /> Hayden <br />lSee figure 6. <br /> <br />Entities served <br /> <br />Mount Werner Water and Sanitation <br />District, Tree Haus district, <br /> <br />Town of Steamboat Springs, Fish <br />Creek Water and Sanitation Dis- <br />trict, West Steamboat Water and <br />Sanitation District, Riverside <br />Water and Sanitation District, <br />and Mount Werner bypass. <br /> <br />KOA campground. Private system. <br /> <br />Sleepy Bear mobile-home park. <br />Private system. <br /> <br />Steamboat II Water and Sanitation <br />District. <br /> <br />Town of Hayden. <br /> <br />9 <br />