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2.04.9 <br /> Page 7 of 46 <br /> C8 -- Torreon stony clay loam, 5 to 20 percent <br /> slopes . This deep, <br /> Well drained soil is on uplands . It formed in colluvium derived dominantly <br /> from basalt and shale. Slope is 5 to 20 percent. The native vegetation <br /> is mainly grass . Elevation is 5, 500 to 6,500 feet. The average annual <br /> Precipitation is 15 to 18 inches , the average annual air temperature is <br /> 46 to 51 degrees F. , and the average frost-free season is 100 <br /> to 125 <br /> days. <br /> Typically the surfade layer is stony clay <br /> Loam 7 inches thick. The <br /> subsurface layer is clay loam 3 inches thick. The subsoil is clay 26 <br /> inches thick. The substr.Otum to a depth of 60 inches <br /> is clay loam. The <br /> soil is neutral to a depth of 29 inches and <br /> is moderately alkaline and <br /> calcareous below that depth. <br /> Included in this mapping unit are small areas of Rombo stony clay <br /> ozim. Pombo so i Is .11-c' 1'jo(ler'-ILely deep to sh'11C. <br /> Permcabijity of this !Torreon soil is slow. Available water capacity <br /> is high. Effective runtidg depth is 60 inches <br /> or more. Runoff is rapid <br /> tiand the hazard of water erosion is high to very high. <br /> This unit is used for rangeland. <br /> lie poLential plant: community an this unit is mainly western wheatgrass , <br /> grama, nnLLwe bluegrass , and needle Mnses . The average annual <br /> production of air-dry vegetation is about 1400 pounds per acre. if the <br /> condition of the range deteriorates, blue grama, three-awn, curlycup <br /> gun,-weed, tumble grass, ring muhly and Kentucky bluegrass increase. Range <br /> seeding is suitable if the range is in poor condition. Livestock grazing <br /> should be managed so that the desired balance of species is maintained in <br />