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<br />' ' Ustollic Hap Ids, loamy ^ss"c}ati.'~-,_^.:ss".5:. ~,,!,-jll0, (255,204 acres)
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<br />This assocIation consists of nearly level to gently sloping soils on
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<br />mesas and terraces (0-9 percent slopes), Elevation ranges from about
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<br />5,500-6,200 feet. The average annual precipitation is about 8-10 inches;
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<br />soil moisture regime is aridic; the average annual soil temperature is
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<br />less than 47"F but more than 59"F, mesic, and frost-free season is 120-140
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<br />days.
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<br />The association has about 85 percent Ustollic Haplargids and about
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<br />15 percent unidentified minor soils that are salty and scattered throughout
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<br />the association; these soils are located in the western part of the area.
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<br />'Ustollic Haplargids are deep well-drained soils over sedimentary
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<br />rocks, Typically they have a thin, dark-colored, loamy surface layer,
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<br />Al horizon, less than 7 inches thick. The subsoil, 10-40 inch layer,
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<br />B2,t horizons, is loamy, with thin clay films on the ped surfaces. The
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<br />substratum is fractured bedrock. The permeability is moderate; effective
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<br />rooting depth is 60 inches+. Available water capacity is high; surface
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<br />runoff is slow, and erosion hazard is high.
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<br />Sediment yield from this association is 0.5-3,0 acre-feet/square
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<br />mile/year, These soils are used for recreation, irrigated cropland, range,
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<br />and wildlife, The general vegetative type is'saltbush-greasewood. Recla-
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<br />mation potential is poor due to excess salts and droughtiness,
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<br />Borollic Camborthids, clayey-Aridic Argiborolls, loamy Association,
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<br />Association 021, (362,445 acres)
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<br />This association consIsts of gently sloping to moderately steep
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<br />soils on uplands and in valleys (3-25 percent slopes). Elevations range
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