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The Rockrimmon Basin lies in northwestern Colorado Springs. The basin is oriented in a southeasterly direction to the outfall points along Monument Creek near the Woodman Road Interchange on Interstate Highway 25. The basin is drained by one major defined channel with many minor contributing branches and, except after a storm, all channels are dry. Lower portions of the drainageway flow are confined in a concrete channel. Sand Creek originates northeast of the city and flows southwesterly through eastern Colorado Springs and joins Fountain Creek approxi- mately 0.5 mile south of the southern corporate limits. Sand Creek is typical of many ephemeral streams in that there is a tendency for the channel to meander over a period of years. Historical evidence of meandering is predominant in the lower reaches where there is relatively less topographic relief and the channel broadens into and becomes part of the flood plain. Two tributaries to Sand Creek, Sand Creek East Fork and Sand Creek Center Tributary, were also studied in detail. Shooks Run is divided into two separate and distinct reaches, North Shooks Run (Templeton Gap Drainage Basin) and South Shooks Run. The Templeton Gap Drainage Basin (North Shooks Run) originates in northeastern Colorado Springs in a cuplike depression, surrounded by hills. It flows southwesterly along and parallel to Templeton Gap Road, until it is intercepted by the Templeton Gap Floodway and diverted northwesterly to Monument Creek. South Shooks Run begins at the Templeton Gap Floodway, and runs parallel to Templeton Gap Road for approximately 2 miles before flowing southerly for approximately 5 miles to join Fountain Creek near the southern corporate limits, approximately 0.25 mile east of u.S. Highway 85-87. The stream originates in a residential area and throughout its course flows through residential or business areas. Spring Creek originates in east-southeastern Colorado Springs, flows southwesterly, and joins Fountain Creek near the Jantell Road crossing. The creek divides into two definite streams near Airport Road (Spring Creek and Spring Creek East Fork). The Spring Creek valley is relatively wide in the northern two-thirds of the basin, becoming deep and narrow in the lower one-third. Long reaches of Spring Creek are concrete lined in industrial and commercial areas. Spring Creek also flows through a lake on Valley Hi Golf Course. , The Templeton Gap Floodway, originating near Acacia Drive and Temple- ton Gap Road, diverts North Shooks Run into Monument Creek. Physiographically, the study area east of Monument and Fountain Creeks is characterized by gently sloping plainsJ west of the creeks, by mountain ranges and basins. There are some horizontal sedimentary outcrops in the Black Forest area which represent rock formations 7