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<br />Cold climate and slope are th.e mCljor 1 imitCltions to ClgriculturCll potential. <br />The close proximi'ty to major recre;'ltlon Csk1L ClreClS, Clnd the nClturCll <br />beauty of the area lead to a high potentiClI for development of home~ <br />sites., recreatron, and related commercj'aI developments. <br /> <br />Map Unit 61 - Lithic Haploborolls, skeletal--Rock Outcrop, moderately <br />steep and steep. <br /> <br />This mClp unrt constitutes 4.7 percent of the basin. The soils in this <br />unit occupy mountain slopes, foothills, and ridges (hogbacks) formed by <br />up ltfted sed imentary rocks, and co 11 uvia I mater 1 a 1 s from these rocks. <br />Slopes are moderately steep and steep. <br /> <br />The elevation ranges from about 8,000 to 10,000 feet (2,438 to 3,048 m). <br />Slopes range from 15 to 50 percent. The average annual precipitation <br />ranges from 15 to 24 inches (0.38 to 0.61 m). The mean soil temperature <br />is about 42 to 47 degrees F. (5.5 to 8.30 C) and the frost free season <br />is approximately 80 to 150 days. This map unit covers 224,000 acres <br />(90,653 ha) - 350 square miles (907 km2). <br /> <br />This map unit is used primarily asgrazeable woodland, wildlife and <br />recreation land; however, it is being developed extensively for cabins <br />and summer homes. Native vegetation is mostly Ponderosa pine, Douglas <br />fir, or Lodgepole pine with many open parks of mixed shrub and grasses. <br /> <br />Droughtiness and steep slope severely limit agricultural potential. The <br />depth to bedrock and slopes also are limitations to non-agricultural <br />uses; however, selected areas have fair to good potential for homesite <br />development and demand for this use is high. <br /> <br />Group VI I - (Pink) <br /> <br />Map Unit 80 - Dune land. <br /> <br />This map unit constitutes 0.8 percent of the basin. This map unit has <br />no true s6il. The area consists of a great expanse of the highest piled <br />inland sand dunes in the United States. This sand has been deposited by <br />southwesterly winds that blow across the basin moving the sands eastward <br />to accumulate at the base of the mountains. <br /> <br />Elevations range from abut 7,800 to 8,800 feet (2,377 to 2,682 m). <br />Slopes on the dunes range from about 5 percent on the windward to about <br />65 percent on the crescent faced lee side. Average annual precipitation <br />is about 9 inches (0.23 m) and mean temperature is about 40 degrees F. <br />(4.40 C). This map unit covers about 37,000 acres (14,974 ha) - 58 <br />square miles (150 km2). <br /> <br />r '.- <br />\.- \. <br /> <br />O<.-l..,..... <br />,.....'<1) <br /> <br />A-17 <br />