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J!fJ.;.:e J1 flat and has an elevation of about 10,000 feet H.8.L. It is surrounded by mountain ranges varying in elevation from 12,000 to 14,000 feet H.S.L. The Tarryall Mountains from the northeast boundary of the South Park area. Elevations in the Plains region vary from approximately 7,000 feet M.S.L. along the foothills to approximately 3,920 feet M.S.L. at Sterling. Climate in the basin is semi-arid varying with the topography. In general, warm summers and mild to cold winters prevail. Intense thunder- storms, sometimes of cloudburst intensity, can occur during summer months. For Sterling's climate: mean annual precipitation is 14.96 inches; J,UY mean temperature is 73.50 F.; and January mean temperature is 24.70 F. The South Platte River in the Sterling vicinity flows in a general northeasterly direction. It has a relatively well-defined channel located within a braid pattern having an approximate overall width of 2,000 feet. The valley of the South Platte River in the Sterling area is broad and shallow, ranging from 8,500 to 17,000 feet in width. It is flanked by rolling plains. Thoughout the study reach, the main channel width averages 450 feet in width. The main channel depth averages 5.5 feet. The streambed has a relatively uniform slope approximating 7 feet per mile. Pawnee Creek Pawnee Creek drains an area of about 703 sQuare miles upstream from its confluence with the South Platte River located about 5 miles southwest of Sterling. It has a well-defined channel having a width of abmlt 80 feet and a depth of about 8 feet upstream from United States Highway 6. It is an alluvial stream flowing through a broad, shallow valley about one mile in width near its confluence with the South Platte River. Although Pawnee Creek is located about 5 miles southwest from Sterling, Pawnee Creek flood waters can flow in an easterly direction towards Sterling.