2008-08-15_REVISION - M2006084 - Laserfiche WebLink

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60 Oermeability of this Razorba soil is moderately rapid. Available water capacity is low. Effective rooting depth is 60 inches or more. Runoff is medium, and the hazard of water erosion is very high. This unit is used mainly for livestock grazing and wildlife habitat. It is also used for very limited production of firewood and poles. The potential plant community on this unit is mainly thin stands of spruce and fir trees with an understory of serviceberry, snowberry, mountain brome, and slender wheatgrass. Smaller amounts of Gambel oak, small aspen, and some pinyon in the lower lying areas commonly are also present in the potential plant community. The production of vegetation suitable for livestock grazing is limited by a short growing season. The potential production of the native understory vegetation in normal years is about 350 pounds of air-dry vegetation per acre. This unit is poorly suited to marketable woodland trees; however, some firewood and corral poles are harvested in some parts of the unit. The main concerns in producing and harvesting timber are steepness of slope and the small size of the areas of the unit. This map unit is in capability subclass Vile, nonirrigated. It is in Spruce-Fir woodland site. complex, 5 to 30 percent 4*0-Redcreek-Rentsac es. This map unit is on mountainsides and ridges. s are elongated and are 40 to 300 acres. The native vegetation is mainly pinyon and juniper trees with an understory of shrubs and grasses. Elevation is 6,000 to 7,400 feet. The average annual precipitation is 14 to 18 inches, the average annual air temperature is 42 to 45 degrees F, and the average frost-free period is 85 to 105 days. This unit is 60 percent Redcreek sandy loam and 30 percent Rentsac channery loam. 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 are small areas of Forelle loam, Piceance fine sandy loam, and Yamac loam. Also included are small areas of Rock outcrop and soils that are similar to these Redcreek and Rentsac soils but are 20 to 40 inches deep to bedrock. Included areas make up about 10 percent of the total acreage. The percentage varies from one area to another. The Redcreek soil is shallow and well drained. It formed in residual and eolian material derived dominantly from sandstone. Typically, the surface layer is brown sandy loam about 4 inches thick. The next layer is brown, calcareous sandy loam about 7 inches thick. The underlying material is very pale brown, calcareous channery loam 5 inches thick. Hard sandstone is at a depth of 16 inches. Depth to hard sandstone or hard Ole ranges from 10 to 20 inches. ermeability of the Redcreek soil is moderately rapid. Available water capacity is very low. Effective rooting Soil survey depth is 10 to 20 inches. Runoff is medium, and the hazard of water erosion is moderate to high. The Rentsac soil is shallow and well drained. It formed in residuum derived dominantly from sandstone. Typically, the upper part of the surface layer is grayish brown channery loam about 5 inches thick. The next layer is brown very channery loam about 4 inches thick. The underlying material is very pale brown extremely flaggy loam 7 inches thick. Hard sandstone is at a depth of 16 inches. Depth to hard sandstone or hard shale ranges from 10 to 20 inches. Permeability of the Rentsac soil is moderately rapid. Available water capacity is very low. Effective rooting depth is 10 to 20 inches. Runoff is medium, and the hazard of water erosion is moderate to high. This unit is used mainly for livestock grazing and wildlife habitat. It is also used as woodland. The potential plant community on this unit is mainly pinyon and juniper with an understory of beardless wheatgrass, Indian ricegrass, serviceberry, mountain mahogany, sedges, and big sagebrush. The potential production of the native understory vegetation in normal years is about 400 pounds of air-dry vegetation per acre. This unit is well suited to pinyon and juniper trees. Woodland products such as firewood, fenceposts, and Christmas trees are available. Because of the steepness of slope, generally only areas of the unit on foot slopes and ridges are accessible for harvesting of trees. Thinning the pinyon and juniper trees increases the production of understory forage plants. This map unit is in capability subclass Vie, nonirrigated. It is in Pinyon-Juniper woodland site. 71-Redrob loam. This deep, somewhat poorly drained soi is on a vial valley floors, low terraces, and flood plains. It formed in mixed alluvium. Slope is 0 to 3 percent. Areas are elongated and are 20 to 80 acres. The native vegetation is mainly cottonwood trees with an understory of shrubs and grasses. Elevation is 5,800 to 7,200 feet. The average annual precipitation is 15 to 18 inches, the average annual air temperature is 39 to 42 degrees F, and the average frost-free period is 85 to 105 days. Typically, the upper part of the surface layer is grayish brown light loam about 4 inches thick. The lower part is grayish brown loam about 13 inches thick. The next layer is grayish brown, stratified loam, sandy loam, and loamy sand 18 inches thick. The underlying material to a depth of 60 inches or more is brown very gravelly and cobbly loamy sand and sand. Included in this unit are small areas of Fluvaquents, frequently flooded; Curecanti very cobbly loam; Kobar silty clay loam; Redrob Variant loam; Shawa loam; and Shawa loam, wet. Included areas make up about 15 percent of the total acreage. The percentage varies from one area to another.