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39— Renohill - Louviers complex, 8 to 25 percent slopes. These moderately deep and shallow, moderately sloping to moderately steep, well drained soils are on upland hills, ridges, and valley side slopes. Elevation ranges from 5.300 to 6.400 feet. Average annual prec pi- tation ranges from about 14 to 17 inches, and average annual air temperature is about 47 degrees F. The Reno- hie soil makes t.p about 40 percent of the unit and the Louviers sod about 30 percent. The Renohill soil is on me valley side slopes and the wider ridgetcps. The Lou - viers sod is generally on the narrow ridgetops, slope breaks, and knobs but may be found anywhere in the mapped area. included with this complex in mapping, and making up about 30 percent of the unit are Cushman loam and Nunn clay loam that have 4 to 8 percent slopes. Also included are steep, badly eroded areas that have very sparse vegetation and contain an intricate maze of narrow ravines, sharp crests, and pinnacles. The Renohill soil is moderately deep and formed in residuum weathered from interbedded sandstone and shale. Typically, the surface layer is grayish brown clay loam about 2 inches thick. The subsoil is grayish brown, light olive brown, and light yellowish brown clay and clay loam. It is calcareous in the lower part. Below that is interbedded sandstone and clay shale at a depth of about 24 inches. Permeability is slow, and available water capacity is moderate. The effective rooting depth is 20 to 40 inches. Surface runoff is rapid. and the hazard of erosion is high. The Louviers soil is shallow and formed in material weathered from rioncalcareous shale. Typically. the sur- face layer is light brownish gray day about 5 inches thick. The substratum is grayish brown clay to a depth of about 14 inches. Below that is clay shale. Permeability is slow, and available water capacity is low. The effective rooting depth is 10 to 20 inches. Surface runoff is rapid, and the hazard of erosion is high. These soils are used mostly for grazing. A few open clay mines are in this mapped area. Rangeland vegetation is mainly western wheatgrass, 'lira bluestern, needleardthread, blue grama, green needlegrass winterfat, and sidecats grams. Following prolonged overgrazing, native bluegrasses, annual grasses; and weeds increase. Contour furrowing or pit- ting aids in the recovery of depleted vegetation on these soils by reducing runoff and increasing water infiltration. Areas that have dense stands of pricktypear or rabbit - brush can be managed by chemical control of these species. These soils are generally unsuited to windbreaks or environmental plantings. Onsite investigation is generally needed to determine which special planting practices are needed to insure survival. These soils have severe limitations for the cons :ruc• tion of homesites, roads, and other urban developments because of the depth to tedrcck, slow permeability. reel, shrink -swell potential, low strength, and slopes. intensive and costly measures are needed to minimize these limit. ing soil properties. This complex is in capability. subclass Vile, nonirrgat- ed. THIS SOIL IS IN BEL CLASS 1 FOR 'LTD AND WAIMI. THERE ARE NO RYDRIC COMMENTS IN TBIS SOIL UNIT. I-