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86 nuts, are produced in areas of this unit. The stands of pinyon and juniper are generally open, and the trees are small. The slope limits access in some areas. The use of tree spades for removal of transplants is severely limited by the depth to bedrock. Thinning the overstory generally enhances reproduction and promotes the growth of grass and younger trees. After pinyon and juniper are thinned or harvested, seeding grasses reduces the hazard of erosion. Range seeding is feasible, but broadcast seeding generally is necessary because of the depth to bedrock and the Rock outcrop. Deferring grazing in harvested areas for at least 2 years ensures the development of a plant cover that is sufficient to protect the soil from erosion. This unit is poorly suited to homesite development. The main limitations are the depth to bedrock and the slope. The capability classification is Vlls, nonirrigated. The Travessilla soil is in the Pinyon-Juniper woodland site. 119-Troutdale-Rogert, warm, complex, 2 to 15 percent slopes. These soils are on ridges and side slopes in intermontane parks. The native vegetation is mainly grasses and scattered pinyon pine. Elevation is 7,200 to 8,500 feet. The average annual precipitation is 14 to 18 inches, the average annual air temperature is 43 to 45 degrees F, and the average frost-free period is 70 to 90 days. This unit is about 65 percent Troutdale soil and 20 percent Bogert soil. The Troutdale soil is mainly in grassy, concave areas. The Rogert soil is on hills and ridges. Included with these soils in mapping are areas of the deep Adderton soils in swales. Adderton soils make up about 10 percent of the unit. Also included are areas of granite or gneiss rock outcrop. Generally, the bedrock is only slightly exposed on the surface. Rock outcrop makes up about 5 percent of the unit. The Troutdale soil is moderately deep and is well drained. It formed in alluvium over residuum derived dominantly from schist and gneiss. Slopes range from 2 to 15 percent. The surface layer is typically dark grayish brown loam about 7 inches thick. The subsoil is sandy clay loam about 15 inches thick. Soft, weathered schist is at a depth of about 22 inches. The soil is neutral to a depth of 14 inches and is mildly alkaline below that depth. Permeability is moderate in the Troutdale soil. Available water capacity is low. Effective rooting depth is 20 to 40 inches. Runoff is slow to rapid, and the hazard of water erosion is slight to high. The Bogert soil is shallow and well drained. It formed in residuum derived dominantly from gneiss and granite. Soil Survey Slopes range from 5 to 15 percent. The surface layer is typically grayish brown very gravelly sandy loam about 5 inches thick. The substratum is extremely gravelly sandy loam about 12 inches thick. Gneiss is at a depth of about 17 inches. The soil is neutral. Permeability is moderately rapid in the Rogert soil. Available water capacity is very low. Effective rooting depth is 1010 20 inches. Runoff is medium or rapid, and the hazard of water erosion is moderate or high. This unit is used as rangeland. The potential plant community on the Troutdale soil is mainly needleandthread, western wheatgrass, Arizona fescue, mountain muhly, and blue grama. The average annual production of air-dry vegetation is about 800 pounds per acre. If the condition of the range deteriorates, sleepygrass, blue grama, broom snakeweed, and fringed sagebrush increase. Range seeding is suitable if the range is in poor condition. The potential plant community on the Rogert soil is mainly mountain muhly, blue grama, Arizona fescue, Gambel oak, and some ponderosa pine. The average annual production of air-dry vegetation is about 600 pounds per acre. If the condition of the understory deteriorates, red threeawn, pricklypear, blue grama, and yucca increase. The Troutdale soil is well suited to homesite development. It is not suited to use as a site for conventional septic tank absorption fields. The Rogert soil is poorly suited to homesite development because of the depth to bedrock. The capability classification is Vle, nonirrigated. The unit is about 75 percent in the Mountain Loam, 13- to 18-inch precipitation zone #226 range site and 25 percent in the Dry Shallow Pine #218 range site. 120-Ustic Torriorthents, bouldery-Rock outcrop complex, 35 to 90 percent slopes. This map unit is on mountainsides. The native vegetation is mainly pinyon and juniper. Elevation is 6,800 to 8,500 feet. The average annual precipitation is 11 to 15 inches, the average annual air temperature is 43 to 47 degrees F, and the average frost-free period is 95 to 120 days. This unit is about 55 percent Ustic Torriorthents, bouldery, and 30 percent Rock outcrop. The components are intermingled on side slopes. Included in mapping are areas of the deep Cascajo Variant and Bronell soils on foot slopes. Cascajo Variant soils have a surface layer of very gravelly sandy loam. They make up about 10 percent of the unit. Bronell soils have a surface layer of very gravelly loam. They make up about 5 percent of the unit. Also included are small areas of talus in landscape positions below the Rock outcrop. The Ustic Torriorthents are mainly very shallow but