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4,860 feet at its confluence with the Cache La Poudre River. Geological formations exposed within the watershed consist of rocks and sediments ranging from Precambrian to Quaternary in age, and the soils in the basin are of the Fluvaquents-Fluvents and Arguistolls-Haplustolls Associations (Reference 4). Fish Creek flows north through Larimer County to its confluence with the Big Thompson River at Lake Estes in the Town of Estes Park. Fall River flows southeast through the county and joins the Big Thompson River in Estes Park. The channels of both streams are well defined and generally narrow, with cobble streambeds and heavy vegetation encroaching upon channel banks. The flood plains are largely undeveloped for both streams, and the soils are of the Argiborolls-Rock Outcrop and Cyroboralfs-Rock Outcrop Associations (Reference 4). The Cache La Poudre River flows in a southeasterly direction through Larimer County. Development along the Cache La Poudre River flood plain is minor at the present time with only a few residential and commercial structures. The channel in the studied section is approximately 160 feet wide and 7 feet deep, with the gradient varying from 28 feet per mile in the upper parts of the study area and 16 feet per mile in the lower parts. The soils within the Cache La Poudre River study area consist of the Fluvaquents-Fluvents Association (Reference 4). Black Canyon Creek was studied from its confluence with Big Thompson River upstream approximately 1.4 miles to McGregor Avenue. The upstream 0.4 mile of this study reach is in Larimer County. The Spring Creek study reach is approximately 7.7 miles long and is located within the unincorporated areas of Larimer County and the City of Fort Collins. As of 1988, the Spring Creek Basin is nearly fully developed throughout its entire length from its confluence with the Cache La Poudre River to Horsetooth Road. Development is primarily residential but also includes some commercial and industrial development. The Town of Berthoud The Town of Berthoud is located in the southeast comer of Larimer County and the southwest comer of Weld County. The town is approximately 25 miles south of the City of Fort Collins. The latest U.S. census population estimate for the Town of Berthoud in 2000 is 4,839 (Reference 61). The Little Thompson River flows easterly through the town. The Town of Estes Park The Town of Estes Park is located in the southwest comer of Larimer County. The Rocky Mountains enhance the setting of this mountain town, which is situated in an upland valley at an elevation of 7,500 feet. The peaks of Rocky Mountain National Park tower to the west. Roosevelt National Forest surrounds the rest of Estes Park. The town's 1980 population was 2,703 (Reference 2) and has grown to a population of 5,413 according to the 2000 U.S. Census (Reference 61). 11