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County, and residential development is occurring at a rapid pace. Significant portions of this part of the county are zoned residen- tial, and planned developments are numerous. The study area is in the South platte River watershed. The study areas of the South Platte River, Horse Creek at Deckers, and West Creek are within the Pike National Forest. All of the other study areas are portions of two subbasins, Plum Creek and Cherry Creek. East Plum Creek originates in Pike National Forest and joins West Plum Creek near Sedalia. Plum Creek flows northerly and joins the south platte River at Chatfield Lake. Cherry Creek, located in the eastern part of the county, flows northerly through Arapahoe County to its confluence with the South platte River in Denver. Plum Creek, with a drainage area of approximately 319.0 square miles. perennially discharges into Chatfield Lake. The detailed- study area includes 10 miles of stream that flow northwesterly through Sedalia and Louviers. Land use plans (Reference 2) indi- cate that the plum Creek watershed primarily covers farmland, with residential development planned for Sedalia and Louviers. Indian Creek. draining an area of approximately 16.7 square miles, perennially flows northeasterly through Douglas County. The detailed-study area includes 1.5 miles of channel at the Indian Creek Subdivision, approximately 3.5 miles upstream from its con- fluence with Plum Creek south of Louviers. West Plum Creek flows northerly from Perry Park to its confluence with Plum Creek at Sedalia. West Plum Creek, which is a perennial stream, drains approximately 27.7 square miles of farmland. The main developed area along the 3.0-mile length of detailed study is Perry Park. East Plum Creek, near the Town of Larkspur. drains an area of approximately 63.2 square miles. It meanders to the north through Douglas County, passing through the Town of Castle Rock, before joining West Plum Creek at Sedalia. The detailed-study area in- cludes 21.5 miles of perennial stream that drain residential areas as well as farmland. Hangmans Gulch, with a drainage area of approximately 1.3 square miles, flows northwesterly through a residentially zoned area of Castle Rock. The detailed-study area includes 2.0 miles of ephem- eral stream. Approximately 0.4 mile north of town, Han9D&ns Gulch joins East Plum Creek. Sellers Gulch, draining 15.5 square miles of sparsely developed residential land southeast of Castle Rock, flows northwesterly and joins East Plum Creek upstream of the Interstate Highway 25 bridge 6