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<br />i <br />, <br />~ <br />, <br />I r <br /> <br />I', <br />" <br />" <br /> <br />. . <br /> <br />Group IV - COrange). <br /> <br />Map Unit 44 - Typic Torr i psamments , nearly level to steep. <br /> <br />This map unit constitutes 3.8 percent of the basin. The soils in thIs <br />unit occupy fans, rIdges, dunes and floodplaIns. They are mostly formed <br />In wind deposited sand from wind worked alluvium. <br /> <br />Elevations range from about 7,600 to 8,000 feet (2,317 to 2,438 mI. <br />Slopes range from 0 on the floodplains up to about 30 percent in the <br />dune areas. The average annual precipItation is about 8 inches (0.2 mI. <br />The mean annual soil temperature is about 45 degrees F. 0.20 C) and the <br />frost free season is approximately 95 days. This ma~ unit covers about <br />184,000 acres (74,465 ha) - 288 square miles (746 km ). <br /> <br />This map unit is nearly all rangeland. Some areas are set aside for <br />recreation use and wildl ife is a secondary use in many areas. Native <br />vegetation is mostly Indian ricegrass, needlegrass, spike dropseed, sand <br />dropseed and saltbush. <br /> <br />The very low annual precipitation, soil blowing, and low available water <br />capacity are limiting to agricultural uses. Dustiness, sandiness, and <br />slope are limiting to non-agricultural use. <br /> <br />Group V - (White) <br /> <br />Map Unit 47 - Pergelic Cryumbrepts, skeletal--Pergelic Cryochrepts, <br />skeletal--Rock Outcrops; sloping to steep. <br /> <br />This map unit constitutes 6.8 percent of the basin. The soils in this <br />unit occupy alpine slopes, and alpine meadows and the unit includes <br />massive mountain peaks, rock outcrops and rock sl ides. The soils are <br />formed in materials weathered in place or locally transportedzlargely <br />from crystalline rocks. <br /> <br />Elevation ranges from about 11,000 to 14,500 feet (3,353 to 4,429 m). <br />Slopes dominantly range from 2 to 50 percent. The average annual pre- <br />cipitation ranges from 30 to 50 inches (0.76 to 1.27 mI. The mean soil <br />temperatures is about 30 to 35 degrees F. (-1.1 to 1.670 C) and freezing <br />temperatures occur in every month of the year. This ma~ unit covers <br />332,000 acres (134,360 ha) - 518 square miles (1,343 km ). <br /> <br />This map unit is used almost exclusively as wildl ife, recreation, and <br />watershed lands; however, there is limited grazing by sheep In some <br />areas. About half the area is unvegetated except for mosses and lichens <br />on the rocks. A wide variety of alpine forbs and shrubs along with a <br />few grasses and sedges vegetate the turf like slopes. Willows, sedges <br />and tufted hairgrass dominate the plant cover on the moist or meadowlike <br />concave slopes. <br /> <br />(\ ,_ '") r.,~ ,.... <br />'"' \' ,.1. \) <br /> <br />A-]O <br />