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<br />6/82 <br />42C--Unnamed gravelly loam, 3 to 12 percent slopes. This deep, <br />well drained soil is on mountain side slopes and benches. It formed in <br />alluvium and colluvium derived dominantly from igneous rocks. Elevation is <br />7,800 [0 8,500 feet. The average annual precipitation is about 16 to 18 <br />inches, the average annual air temperature is 37 to 40 degrees F, and the <br />frost-free season is 50 to 75 days. <br />Typically, the surface layer is dark grayish brown gravelly loam about <br />11 inches thick. The subsoil is pale brown gravelly clay loam about 19 <br />inches thick. The substratum to a depth of 60 incli~ .s very pale brown <br />very gravelly sandy loam. <br />Included in this unit are small areas of a sir,:,..: soil that has highly <br />weathered bedrock at depths of 20 to 40 inches. <br />Permeability of [his Unnamed soil is moderate. Available water <br />capacity is moderate. Runoff is slow, and the hazard of water erosion is <br />slight. <br />Most areas of this unit are used for livestock grazing and wildlife <br />habitat, a few areas are used for irrigated hay. <br />The potential plant community on this unit is mainly Letterman <br />needlegrass, Columbia needlegrass, mountain brome, Idaho fescue. Other <br />plants that characterize this site are slender wheatgrass, low rabbitbrush, <br />and mountain snowberry. The average annual production of air-dry vegetation <br />is 1,500 pounds oer acre. <br />If the range condition deteriorates, the proportion of less preferred <br />forage plants increase, and the proportio^, of preferred forage giants <br />decrease. Therefore, grazing should be managed so that [he desired balance <br />of species is maintained in the plan[ community. <br />-7- <br />