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321 ?7 ,. f'~ h' ,. f.! .\. " 6,000:-8,000 feet.'he avc~age annu;Jl prectPitattres about 12-15 inches; moisture regime is aridic; the average annual soJ1 temperature is less than 470F (frigid) and the frost-free season is 60-90 days, The association has about 60 percent B~rollic Haplargids, 20 percent Ustic Torriorthents, 15 percent Argiborolls, 'and 5 percent of unidentified minor soils, located in the extreme southern part of Routt County, Borollic Haplargids are moderately deep, well-drained soils over shale and sandstone. Typically, they have a thin, dark-colored, loamy surface layer, Al horizon, less than 7 inches thick, The subsoil (10-36 inch layer, B2t horizons, is loamy, with thin clay films on the ped surfaces. The substratum is fractured bedrock. These soils are rapidly permeable; effective rooting depth is 20-36 inches. Available water capacity is moderate; surface runoff is rapid and erosion hazard is high. Ustic Torriorthents are moderately deep, well-drained soils over shales and sandstone. Typically they have a light-colored, loamy surface layer, Cl horizon, about 10 inches thick, The substratum, C2 horizon, is a gravelly loamy material overlying fractured bedrock. These soils are rapidly permeable; effective rooting depth is 20-36 inches. Available moisture capacity is moderate; surface runoff is rapid and erosion hazard is high. Sediment yield from this association is 0.5-1.0 acre-feet/square mile/year. These soils are used mainly for range, wildlife, watershed, and small areas of semi-wet pastures in alluvial valleys, The general vegetative type is sagebrush. Reclamation potential is fair to good. 3 .-------------~..,., "'-=-~. .to' ~_., '