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-19- The only tributary entering the Green River between Stations No. 4 and No. 5 is Bitter Creek. Bitter Creek itself is intermittant; it rises rapidly with the first spring thaws and maintains a flow until late June or early July. The stream contributes a heavy silt load during this period. The flow after July is maintained 100% by the outfall of the Rock Springs sewage disposal plant. This disposal plant contributes approximately 900,000 gpd. to Bitter Creek at the point of outfall. The population served by this disposal system is estimated at 13,000 and the BOD reproduction is estimated by plant operator at 85 to 90%. With this BOD reduction, the effluent enter- ing Bitter Creek at the point of outfall would be the equivalent of a town with a population of 1,300 to 1,950 with no disposal system. There are no ~~~ facilities for chlorination of the outfall, and there are indications that the final settling basin does not have adequatie retention time to allow the effluent to stabilize. Consequently, although the BOD reduction at this plant is excellent, the coliform count is high anal some undesirable compounds are present in the effluent. The following table is an analysis run on the effluent from the Rock Springs Sewage Disposal Plant in 1957. TABLE III Rock Springs Sewage Disposal Plant Analysis Concentrations- _ Turbidity pH Chlorides Phosphates Ammonia Nitrogen Ammonia Nitrate Nitrogen Nitrite Nitrogen coliform organisms 9.6 cm (260 ppm.) 7.5 97.5 ppm. 11.2 ppm. 9.6 ppm. 11.7 ppm. 40.0 ppm. .186 ppm. 245,000 per ml. Two coliform plate counts were made at ,the mouth of Bitter Creek in November, 1959. O~.e plate developed 132 colonies per cc., and the other 134 colonies per cc. These counts are above the concentrations recommended by the California Water Quality Criteria for fresh water fish. Bitter Creek, from a fisheries standpoint, is a sterile stream. The concentrations of compounds in the water during the majority of the year have eliminated all bottom fauna. The only algae present is found at the mouth. of the stream. The bottom of the stream is hardpan and shifting silt and sand. River flow data collected at the town of Green Riverois presented in Graph No: II for the years 1956 through 1959. Station No. 5 - Kinkaid Ranch This station is located approximately 5 miles below the town of Green River, T17N; R106W; S8.