18 . SOIL SURVEY •
<br />18-Rock outcrop-Cryoborolls complex. Areas of this
<br />complex are on mountainsides, ridges, end escarpments
<br />(fig. 4). They are scattered throughout the survey area at
<br />elevations of 8,000 to 13,000 feet. The average annual
<br />precipitation is 15 to 30 inches, the average annual air
<br />temperature ie 32 to 38 degrees F, and the frost-free
<br />season is 20 to 75 days. Slope is 30 W 70 percent. Rock
<br />outcrop makes up about 70 percent of this complex and
<br />Cryoborolls make up about 20 percent. Included in
<br />mapping are small areas of Cryoboralfs and Cryochrepts,
<br />which make up the other 10 percent.
<br />Rock outcrop consists of exposed hard bedrock of mixed
<br />materials including granite, sandstone, end shale.
<br />Cryoborolls are shallow and moderately deep, well
<br />drained loamy soils that are stony throughout. They are
<br />steep and very steep. They have a dark colored surface
<br />layer, and bedrock is at a depth of 10 to 40 inches. Reaction
<br />is slightly acid to moderately alkaline.
<br />Cryoboralfs are shallow and moderately deep, well
<br />drained loamy soils that are stony throughout. They aze
<br />steep and very steep. They have a light colored, bleached
<br />subsurface layer and a strongly developed subsoil
<br />Bedrock is at a depth of 10 to 40 inches. Reaction ie
<br />strongly acid to slightly acid.
<br />Cryochrepts are shallow to moderately deep, well
<br />drained, loamy soils that are stony throughout. They are
<br />steep and very steep. They have a dazk colored surface
<br />layer and a weakly developed subsoil. Bedrock is at a
<br />depth of 10 to 40 inches. Reaction is moderately acid to
<br />very strongly acid.
<br />Permeability of these soils is rapid and the available
<br />water capacity is tow. Surface runoff is rapid. The hazard
<br />of wind erosion is slight, and the hazard of water erosion
<br />is moderate.
<br />Most of the acreage is range far wildlife. Small areas
<br />can be used as range for livestock. These areas are so in-
<br />accessible that then use for agriculture or recreation
<br />homesite subdivisions is limited.
<br />The dominant native vegetation at elevations of 8,000
<br />to 9,000 feet consists of wheatgrasses, bluegrasses,
<br />sagebrush, snowberry, antelope bitterbrush, and nu-
<br />merous forbs. At elevations of 9,000 to 11,500 feet, native
<br />vegetation consists of lodgepole pine, Engelmann spruce,
<br />subalpine fir, and a sparse underetory of grasses, shrubs,
<br />and forbs. At elevations above 11,500 feet, native vegeta-
<br />tion is dominated by willows, sedges, and numerous forbs.
<br />19C-Youga loam, 0 to 6 percent elopes. This ie a
<br />deep, well drained, nearly level to gently sloping soil on
<br />mountainsides. It formed in glacial drift derived from
<br />various sources. The average annual precipitation is about
<br />18 inches, the average annual a'v temperature is about 3?
<br />degrees F, and the frost-free season is 30 to 75 days.
<br />Elevation is 7,500 to 9,000 feet.
<br />Small areas of Quander, Leavitt, Cimarron, and Anvik
<br />soils are included in mapping. ALgo included are areas that
<br />have 1 to 2 inches of peat on the surface and mottling in
<br />the subsoil as a result of rnntinuous irrigation.
<br />Typically, the surface layer is dark grayish brawn loam
<br />about 12 inches thick. The subsoil is yellowish brown and
<br />strong brown clay loam about 53 inches thick. The sub-
<br />stratum is light yellowish brown sandy clay loam to a
<br />depth of 60 inches or more.
<br />Permeability is moderately slow, and the available
<br />water capacity is high. Surface runoff is medium. The
<br />hazard of wind and water erosion is slight,
<br />Most of the acreage is rangeland that is also used for
<br />recreation, wildlife, andvrigated grass hayland. A cold
<br />climate and a short growing season limit the production
<br />of introduced grasses and preclude use of this soil as
<br />cropland.
<br />Management of this soil far range should include a
<br />deferred grazing system and brush control. Where this
<br />soil is irrigated, ditches and fields should be designed
<br />carefully to properly control irrigation water. Grasses
<br />recommended for seeding include western wheatgrass,
<br />slender wheatgrass, bluebunch wheatgrass, mountain
<br />brome, Arizona fescue, and big bluegrass. The dominant
<br />native vegetation consists of wheatgrass, Junegrass, big
<br />sagebrush, snowberry, and numerous forbs. The total an-
<br />nual production averages about 1,G00 pounds of air-dry
<br />forage per acre.
<br />There are no restrictive soil properties to be considered
<br />in the design of access roads and recreation homesite sub-
<br />divisions. However, all-weather asphalt surfaces are im-
<br />practical unless provisions are made to offset frost action.
<br />Rangeland wildlife includes mule deer, sage grouse,
<br />white-tailed jackrabbit, mourning dove, ground squirrels,
<br />and yellow-bellied marmot. Capability suLclass Vle.
<br />19D-Youga loam, 6 to IS percent slopes. This is a
<br />deep, wep drained, moderately sloping to strongly sloping
<br />soil on mountainsides. !t formed in glacial drift derived
<br />from a variety of sources. The average annual precipita-
<br />tion is about 18 inches, the average air temperature is
<br />about 37 degrees F, and the frost-free season is :i0 to 75
<br />days. Elevation is 7,500 to 9,000 feet.
<br />Small areas of Quander, Leavitt, Cimarron, and Anvik
<br />soils are included in mapping. Also included are areas that
<br />have 1 to 2 inches of peat on the surface and mottling in
<br />the subsoil as a result of continuous irrigation,
<br />Typically, the surface layer is dark grayish brown loam
<br />about 12 inches thick. The subsoil is yellowish brown and
<br />strong brown clay loam about 53 inches thick. The sub-
<br />stratum is light yellowish brown sandy clay loam to a
<br />depth of 70 inches or more.
<br />Permeability is moderately slow, and the available
<br />water capacity is high. Surface runoff is medium. The
<br />hazazd of wind erosion is slight, and the hazard of water
<br />erosion is moderate.
<br />Most of the acreage is rangeland that is also used fog
<br />recreation and wildlife habitat and as imgated grass hay
<br />land. A cold climate and a short growing season limit the
<br />production of introduced grasses and preclude use of the
<br />soil as cropland.
<br />Management of this soil for range should include ;
<br />deferred grazing system and brush control Where thi
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