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GENERAL The following report has been completed in compliance with the Scope of Work outlined in our proposal of March 1, 1977. The objective of the analysis is to determine the affect of the Sweetwater Creek Flood Plain on a new residence hall under construction at the Anderson Camp. The Camp is located on Sweetwater Creek just upstream from the junction of Sweetwater Creek and the Colorado River. (See Figure 1) On July 12, 1976, a severe local cloudburst storm oc- curred in the lower reaches of Sweetwater Creek basin, producing serious flooding along Sweetwater Creek. An old residence hall was moved from its foundation by the flood flow and transported downstream approximately 100 feet. Flood flows were accompained by significant amounts of mud, rocks, and other debris. Travis Anderson, owner of the Camp, has started construc- tion on a replacement residence hall in the same location as the original hall. (See Sheet I of 2) The finished floor elevation has been raised from that of the original hall. The new residence hall is of conventional stick built construction and located on a concrete foundation. County Commissioners determined that a building permit had not been obtained for the reconstruction of the resi- dence hall and have made a flood plain analysis a part of the requirements for obtaining a building permit to com- plete the hall prior to occupancy. HYDROLOGY The Sweetwater Creek drainage basin has a total area of 103.1 square miles. (See Figure 1) Of this area, 54 square miles are located above, and tributary to Sweet- water Lake. The basin extends from elevations above 11,000 feet in the Flat Tops Wilderness Area, to an elevation of 6,300 at the stream's junction with the Colorado River. Numerous small lakes are located in the upper portion of the basin. Vegetation cover varies from dense spruce, aspen, and alpine meadows in the upper elevations, to sagebrush, juniper, and scrub oak at the lower elevations.