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valley walls along the lower Blue River. Along much of the Snake River and Tenmile Creek, these soils occur on the flood plain. T Ese SOl S a colored and wet, and those soils that occupy tl. ere moun in slopes and high plateaus are moderately deep to deep, light colored and well drained. The soils were formed in materials weathered from a variety of crystalline and sedimentary rocks. Granite, sandstone, gneiss, basalt, rhyolite, and other rock outcrops are interspersed among the soil areas. The native vegetation consists mainly of Engelmann's spruce, subalpine fir, lodgepole pine, limber pine, and aspen.. The remainder of the county, alpine areas ranging in elevation from 11,000 feet to 14,500 feet, consists of the Rock Outcrop-cryumbrepts- Cryochrepts Association and the Ptarmigan-Bobtail-Rock OUtcrop Asso- ciation. Mosses and lichens on the rocks are the only vegetation types in much of this area. A variety of alpine shrubs along with a few grasses and sedges grow On the more protected slopes (References 4 and 5). i' The Slue River basin, which covers all of summit County, is on the west side of the Continental Divide and feeds into the Colorado River at the Town of Kremmling. The basin has a drainage area of 514 square miles and generally drains in a north to northwest direc- tion. The basin width ranges from 21 miles at Lake Dillon to 9 miles at Green Mountain Reservoir. The topography is mountainous with larger rivers in deep broad valleys and smaller creeks in steep gullies. The basin is bounded by the Continental Divide on the east and south, from Loveland Pass to Fremont Pass; the Gore Range and Vail Pass form the boundary On the west. The average elevation in the basin is approximately 10,000 feet (Reference 6). There has been little development along the riverbanks with the exception of some gravel-mining operations and scattered houses. The Willow Creek basin drains to the east from the Gore Range into Blue River at Silverthorne. It has a total drainage area of 13.5 square miles and a basin length of 4.3 miles. The basin width varies from 4 miles, at the upper section around willow Lakes, to 1 mile, at the foot of the Gore Range. The channel slope averages 2.7 percent at Silverthorne and 9.8 percent in the Gore Range. The elevations in the basin range from 8,620 to 13,300 feet. Tenmile Creek flows to the north or northeast for 12 miles from near Fremont Pass to Lake Dillon. Tenmile Creek basin parallels the upper Blue River basin, and Tenmile Range divides the two. The western boundary of the basin is formed by the Gore Range and Vail Pass, and the southern boundary is the Continental Divide. The upper basin is characterized by open, rolling terrain. In contrast, the lower basin consists of narrow, winding Tenmile Canyon. At ~risco, the total drainage area is 94 square miles, 35 square miles of which~is in the upper basin above the confluence with West Ten- mile Creek. The basin width is 7 miles, and the total basin length , 6