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City of Colorado Springs Flood Ha%ard Mitigation Plan Pine Creek. Note. Stream Ermion Near Home-aite Woodman Road to approximately 7,000 feet downstream. West of the main stem of the creek lies rough and broken mountain terrain. The vegetation ~anges from mixed coniferous trees to hardy shrubs and mountain grasses. East of the main stem lies the high plateau that descends gradually to gently rolling land covered by grass, shrubs, and bushes. Both coniferous and deciduous trees grow along the creek banks. The Peterson Field Drainage is a left bank tributary of Sand Creek, entering at 0.25 mile from Sand Creek's confluence with Fountain Creek. The upper one-third of the basin is characterized by shallow swales that convey overland flow across Peterson Airfield. Deten- tion ponds under development within the air- field boundaries substantially limit peak flows from this area. The lower portions ofthe drainage are characterized by light industrial and residential development; the channel is concrete lined from Monica Drive to its conflu- ence with Sand Creek. Pine Creek, a narrow, deep stream, joins Monument Creek in northern Colorado Springs and is 7 miles long. It has a drainage area of approximately 10 square miles. The upper reach of Pine Creek is an area of recent annexation and potential development. The lower reach borders U.S. Air Force Academy land. Heavy commercial development has taken place in the lower portions of the Pine Creek basin. North Pine Creek is a right bank tributary of Pine Creek entering in the upper reaches of Pine Creek. 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 chan- nels are dry. Lower portions of the drainage way flow are confined to a concrete channel. Sand Creek originates northeast of the city and flows southwesterly through eastern Colorado Springs and joins Fountain Creek 0.5 miles south of the southern corporate lim- its. 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 predomi- nant in the lower reaches where there is rela- tively less topographic relief and the channel broadens into and becomes a part of the flood Sand Creek. One of Two New Bridge. 4