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Wild Horse-Dry Creek is sometimes referred to as Dry Creek. The Arkansas River flows eastward through the urban center of Pueblo, dividing the city into north and south sections. The three tribu- taries flow south to the Arkansas River, dividing the northern section of Pueblo into four subsections. Above the mouth of Fountain Creek, the Arkansas River watershed comprises approximately 4,704 square miles, excluding the Wild Horse-Dry Creek area. The terrain descends from the mountain head- waters of the Arkansas River near Leadville, Colorado, where mountain peaks exceed 14,000 feet, to approximately 4,700 feet at Pueblo. The Arkansas River above Canon City is a typical mountain torrent that descends over 6,000 feet in elevation over a distance of less than 130 miles at gradients often exceeding 50 feet per mile. Between Canon City and Pueblo, the valley is generally narrow and the stream- bed is well-defined, with a gradient ranging from 10 to 23 feet per mile. The Fountain Creek watershed, approximately 65 miles long as measured from Palmer Lake, Colorado, to the Arkansas River confluence at Pueblo, is a max~um of 25 mdles wide in the vicinity of Colorado Springs and constitutes a drainage area of 927 square miles. The creek originates approximately 7 miles northwest of Pikes Peak, in the mountains of the Rampart Range of the Rocky Mountains, near Colorado Springs. Elevations in the watershed vary from 14,109 feet at Pikes peak to 4,627 feet at the river's mouth in Pueblo. The streambed elevations within the study reach vary from 4,627 feet at the mouth of Fountain Creek to 5,152 feet at the north Pueblo County line. The channel slopes uniformly at approximately 24 feet per mile. The Dry Creek (East) basin is 5.5 miles long from the headwaters to the mouth and drains an area of 5.4 square miles. Elevations range from 5,265 feet at the headwaters to 4,608 feet at the conflu- ence with the Arkansas River. The average slope in the watershed is approximately 114 feet per mile. Dry Creek (East), an ephemeral stream, originates at the southern extremity of Baculite Mesa, in the high plains northeast of pueblo, and flows southerly to discharge into the Arkansas River. University Park Tributary is an unnamed tributary of Fountain Creek. It flows south of the University Park subdivision and empties into Fountain Creek upstream of State Highway 47. It is referred to as University Park Tributary in this study for purposes of clarity and convenience. The Wild Horse-Dry Creek watershed, approximately 17 miles long (as measured from the headwaters to the Arkansas River confluence at Pueblo) and averaging 5 miles wide, has a drainage area of 85.8 square miles. Elevations vary from 6,000 feet near the headwaters to 4,670 feet at the mouth. The separate ephemeral streams, Wild 6