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<br />, <br /> <br />This map unit is used mostly as rangeland but about one-fourth of the <br />total acreage is irrigated for crop and pasture production. Native <br />vegetation is a mixture of salt tolerant shrubs and grasses in open and <br />often patchy stands. Greasewood and rabbitbrush are dominant. Alkali <br />sacaton, western wheatgrass and saltgrass are in the understory. <br />Potatoes, alfalfa and barley are the important irrigated crops. <br /> <br />Excess salts, low available water capacity and cold climate are the <br />primary limiting factors to irrigated crop production. Soils are only <br />slightly limited for most non-agricultural uses except in locations <br />where irrigation has raised the water table. <br /> <br />Map Unit 7 - Boroll ic Haplargids; loamy--Boroll ic Calciorthids, loamy; <br />nearly level to sloping. <br /> <br />This map unit constitutes 10.4 percent of the basin. The soLis in this <br />unit occupy alluvial fans and valley sideslopes. The soils are formed <br />in mixed alluvium. <br /> <br />Elevations range from about 8,000 to 9,000 feet (2,438 to 2,743 m). <br />Slopes range from 0 to 15 percent. The average annual precipitation <br />ranges from 8 to 12 inches (0.2 to 0.3 m). The mean annualsoi I temp- <br />erature is about 45 degrees F. (7.20 C) and the frost free season is <br />approximately 90 to 110 days. This map unit covers about 502,000 acres <br />(203,159 ha) - 784 square miles (2,031 km2). <br /> <br />This unit is used mostly as rangeland, but a few areas are irrigated <br />for production of both pasture and crops. Native vegetation is a sparse <br />stand of rabbitbrush, winterfat, Indian ricegrass, blue grama, sand <br />dropseed and needle grasses. Barley, potatoes and alfalfa are the <br />principal irrigated crops. Most of the irrigated pastures are a mixture <br />of grasses and sedges. <br /> <br />Map Unit 17 - Typic Natrargids, clayey--Typic Torripsamments; nearly <br />level to moderately steep. <br /> <br />This map unit constitutes 6.3 percent of the basin. The unit occupies a <br />nearly level basin floor and intermingled sand dunes and ridges. The <br />soils are formed in all'uvial materials and wind-deposited sands. <br /> <br />Elevations over the unit range from about 7,500 to 7,600 feet (2,286 to <br />2,317 m). Slopes are dominantly 0 to 2 percent over most of the unit <br />but range up to 15 percent in the dune areas. The average annual precip- <br />itation is about 7 inches (0.18 m). The mean annual soil temperature is <br />about 45 degrees F. (7.20 C) and the frost free se'ason is approximately <br />95 days. This map unit covers about 304,000 (123,029 ha) - 475 square <br />miles (1,230 km2). <br /> <br />This map unit is used mainly as rangeland. <br />cropping, primarily on the arable included <br />is dominated by greasewood and rabbitbrush <br />saltgrass and alkali sacaton. Large areas <br />scattered greasewood. <br /> <br />There is some Lrrigated <br />soils. Native vegetation <br />with scattered patches of <br />have no vegetation other than <br /> <br />C'~ " ...., () <br />\.' - ,~....~ <br /> <br />A-6 <br />