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• 113 -Kemmerer -Yamo complex, 5-30% slopes <br />This unit is found on hillsides. Elevation is 6,100 to 7,200 feet. The average annual precipitation <br />is 11 to 13 inches, the average annual air temperature is 42 to 45 degrees F., and the average <br />frost-free period is 75 to 95 days. <br />This unit is 60 percent Kemmerer soil and 20 percent Yamo soil. Included in this unit are small <br />areas of Moyerson, Pirelli and Forelle soils. <br />The Kemmerer soil is moderately deep and well drained. It formed in residuum derived from <br />shale. Typically the surface layer is light brownish gray silty clay loam and is 3 inches thick. <br />The next 8 inches is light olive brown clay and silty clay. The lower part to a depth of 22 or more <br />inches is light yellowish brown clay loam. Weakly consolidated interbedded shale and loamstone <br />bedrock is at a depth of 22 inches. Depth to weakly consolidated bedrock ranges from 22 to 28 <br />inches. <br />Permeability of the Kemmerer soil is very slow. Available wwater holding capacity is low. <br />Effective rooting depth is 22 to 28 inches. Runoff is very high, a d the hazard of water erosion is <br />moderate. The hazard of soil blowing is high. <br />The Yamo series is very deep and well drained. It is formed in luvium derived from sandstone <br />and in loess. Typically, the upper 5 inches of the surface layer is~rayish brown loam. The lower <br />0 inches is grayish brown clay loam. The upper 23 inches of the subsoil is grayish brown sandy <br />clay loam. The lower part to a depth of 60 or more inches is grayish brown loam. <br />• Permeability of this Yamo soil is moderate. Available water holding capacity is high. Effective <br />rooting depth is 60 inches or more. Runoff is moderate, and the hazard of water erosion is <br />moderately high. The hazazd of soil blowing is low. <br />This unit is used for rangeland, irrigated hayland, cropland, and for homesite development <br />117 -Lamphier-Jerry complex, 25-65% slopes <br />This map unit is on mountain sides. Elevation is 7,200 to 8,600 feet. The average annual <br />precipitation is 18 to 20 inches, the average annual air temperature is 37 to 40 degrees F., and the <br />average frost-free period is 50 to 75 days. <br />This unit is 45 percent Lamphier soil and 30 percent Jerry soil. Included in this unit aze small <br />areas of rock outcrop, and Danavore soils, Skyway soils, and soils that are moderately deep and <br />contain more than 35 percent rock fragments. <br />The Lamphier soil is very deep and well drained. It formed in mixed colluvium and residuum <br />derived from sandstone. Typically, the surface is covered with a mat of partially decomposed <br />leaves and twigs 2 inches thick. The surface layer is grayish brown fine sandy loam 22 inches <br />thick. The subsoil is grayish brown sandy clay loam 8 inches thick. The substratum to a depth of <br />60 inches or more is pale brown sandy clay loam. <br />Permeability of the Lamphier soil is moderate. Available water holding capacity is moderate. <br />Effective roofing depth is 60 inches or more. Runoff is rapid and the hazard of water erosion is <br />very high. The hazard of soil blowing is slight. <br />