2002-04-24_REVISION - M1978283 - Laserfiche WebLink

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Soil survey • u 34 slopes of dissected plateaus. The native vegetation is mainly pinyon and juniper. Elevation is 6,300 to 7,500 feet. The average annual precipitation is 14 to 16 inches, the average annual air temperature is 48 to 54 degrees F, and the average frost-free period is 100 to 130 days. This unit is about 40 percent Louviers very channery clay loam, about 35 percent Travessilla channery sandy loam, and about 20 percent Rock outcrop. The Louviers soil is on the lower side slopes, and the Travessilla soil is on the upper side slopes. Rock outcrop is mainly on the upper side slopes. The components of this unit are so intricately intermingled that it was not practical to map them separately at the scale used. Included in this unit is about 5 percent deep Kim loam in drainageways and on foot slopes. The Louviers soil is shallow and well drained. It formed in residuum derived dominantly from clayey shale. Typically, the surface layer is brown very channery clay loam about 3 inches thick. The next layer is clay loam about 7 inches thick. The substratum is clay loam about 6 inches thick. Soft shale is at a depth of 16 inches. The soil is neutral throughout. Permeability of the Louviers soil is slow. Available water capacity is very low. Effective rooting depth is 10 to 20 inches. Runoff is very rapid, and the hazard of water erosion is very high. The Travessilla soil is shallow and well drained. It formed in residuum derived dominantly from sandstone. Typically, the surface layer is light brownish gray channery sandy loam about 6 inches thick. The substratum is channery sandy loam about 9 inches thick. Sandstone is at a depth of 15 inches. The soil is mildly alkaline to a depth of 6 inches and moderately alkaline below that depth. Permeability of the Travessilla soil is moderately rapid. Available water capacity is very low. Effective rooting depth is 6 to 20 inches. Runoff is very rapid, and the hazard of water erosion is very high. Rock outcrop consists of barren sandstone ledges. This unit is used as woodland and for livestock grazing. The potential plant community on this unit is mainly pinyon and juniper and an understory of Indian ricegrass, muttongrass, and little bluestem. The Petationl in normal production of the native understory veg years is about 400 pounds of air-dry vegetation per acre. Slope limits access by .?vestock and results in overgrazing of the less sloping areas. Trails or walkways can be constructed in places to encourage livestock to graze in areas where access is limited. Mechanical treatment is not practical, because the surface is stony and slopes are steep. Woodland products such as firewood, fenceposts, Christmas trees, and pinyon nuts are available in some areas of this unit. Mature stands of trees can produce 6 to 6 cords of firewood per acre if all trees are removed. Only the foot slopes and ridges generally are accessible because of steepness of slope, which limits the harvesting of trees. This unit is poorly suited to homesite development. On the lower side slopes, the main limitations are shallow depth to shale, shrink-swell potential, and steepness of slope. On the upper side slopes, the main limitations are shallow depth to sandstone and steepness of slope. This map unit is in capability subclass Vlle, nonirrigated. It is in the PinyonJuniper woodland site. 38-Lymanson cobbly fine sandy loam, 20 to 40 percent slopes. This moderately deep, well drained soil is on mountainsides. It formed in colluvwm derived dominantly from conglomeritic tuff. The native vegetation is mainly ponderosa pine. Elevation is 8,500 to 9,000 feet. The average annual precipitation is 14 to 18 inches, the average annual air temperature is 40 to 44 degrees F, and the average frost-free period is 55 to 75 days. Typically, the surface layer is grayish brown cobbly fine sandy loam about 3 inches thick. The subsoil and substratum are gravelly sandy clay loam about 26 inches thick. Conglomeritic tuff is at a depth of 29 inches. The soil is neutral to a depth of 12 inches and moderately alkaline below that depth. Included in this unit are about 5 percent Rock outcrop which occurs as narrow bands, and 5 percent gravelly sandy loam on ridgetops. Also included are small areas of a deep sandy loam in drainageways and on foot slopes. Permeability of this Lymanson soil is moderate. Available water capacity is low. Effective rooting depth i; 20 to 40 inches. Runoff is rapid, and the hazard of wale erosion is very high. This unit is used for livestock grazing, woodland, and wildlife habitat. The potential plant community is mainly ponderosa pine and an understory of Arizona fescue, mountain muhly, and pine dropseed. The potential production of the native understory vegetation in normal years is aboi 1,200 pounds of air-dry vegetation per acre. Range seeding generally is limited to the broadcast method because of steepness of slope. This unit is poorly suited to the production of ponderosa pine. The ponderosa pine trees are scattere and the site index for this species is very low. This unit is poorly suited to homesite development. It is limited mainly by steepness of slope. This map unit is in capability subclass Vlle. It is in the Ponderosa Pine woodland site. 39-Maitland fine sandy loam, 1 to 15 percent slopes. This deep, well drained soil is on uplands and foot slopes. It formed in colluvium derived dominantly from sandstone and shale. The native vegetation is mainly ponderosa pine. Elevation is 7,000 to 8,000 fee' The average annual precipitation is 16 to 23 inches, th average annual air temperature is 40 to 44 degrees F, and the average frost-free period is 75 to 100 days. Typically, the surface is covered with a mat of partia decomposed twigs and needles about 1 inch thick. Thy