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<br />nant, brush control is needed. If the site is in poor condi-
<br />tion, seeding may be needed. Arizona fescue, big blue-
<br />grass, slender wheatgrass, smooth brome, western
<br />wheatgrass, and intermediate wheatgrass are suitable for
<br />seeding. The seed should be drilled into a firm seedbed.
<br />This soil provides winter range for mule deer and elk.
<br />Other wildlife include sage grouse, jackrabbit, cottontail,
<br />and coyote. Livestock grazing management and sage-
<br />brush control are necessary to protect the big game
<br />winter range.
<br />The low strength and high shrink -swell potential are
<br />the soil properties most limiting to community develop-
<br />ment.
<br />The capability subclass is Vle.
<br />46— Leavitt loam, 6 to 15 percent slopes. This deep,
<br />well drained, moderately sloping to strongly sloping soil
<br />is on fans and terraces at elevations of 7,500 to 8,500
<br />feet. It formed in local alluvium from sedimentary rock.
<br />The average annual precipitation is about 14 to 18
<br />inches, the average annual air temperature is about 37
<br />to 42 degrees F, and the frost -free season is about 35 to
<br />75 days.
<br />Small areas of Harsha loam, Roxal loam, Lymanson
<br />loam, and Tine cobbly loam are included in mapping.
<br />Typically the Leavitt soil has a grayish brown loam
<br />surface layer about 6 inches thick. The subsoil is brown
<br />clay loam about 28 inches thick. The substratum is pale
<br />brown clay loam that extends to 60 inches or more.
<br />Permeability is moderate. The effective rooting depth
<br />is 60 inches or more. The available water capacity is
<br />high. Surface runoff is slow, and the erosion hazard is
<br />moderate.
<br />Most of the acreage is rangeland. Part of it is used for
<br />recreation and wildlife. A small acreage is irrigated and
<br />used for hay. The cold climate and short growing season
<br />limit the production of introduced grasses and preclude
<br />the use of this soil as cropland.
<br />Whealgrass, muttongrass, Idaho fescue, and big sage-
<br />brush are dominant in the rangeland vegetation.
<br />Grazing no more than 50 percent of the key species,
<br />by weight of the current season production, will maintain
<br />the condition of this site. If shrubs are dominant, brush
<br />control is needed. If the site is in poor condition, seeding
<br />may be needed. Arizona fescue, big bluegrass, slender
<br />wheatgrass, smooth brome, western wheatgrass, and in-
<br />termediate wheatgrass are suitable for seeding. The
<br />seed should be drilled into a firm seedbed.
<br />This soil provides winter range for mule deer and elk.
<br />Other wildlife include sage grouse, jackrabbit, cottontail,
<br />and coyote. Livestock grazing management and sage-
<br />brush control are necessary to protect the big game
<br />winter range.
<br />The low strength, the shrink -swell potential,/and the
<br />slopes are the features most limiting to community devel-
<br />opment. Road design should provide drainage outlets for
<br />surface runoff.
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<br />SOIL SURVEY
<br />The capability subclass is Vie.
<br />47— Leavitt loam, 15 to 55 percent slopes. This
<br />deep, well drained, moderately steep to steep soil is on
<br />mountainsides at elevations of 7,500 to 8,500 feet. It
<br />formed in local alluvium from sedimentary rock. The
<br />average annual precipitation is about 14 to 18 inches,
<br />the average annual air temperature is about 37 to 42
<br />degrees F, and the frost -free season is about 35 to 75
<br />days.
<br />Small areas of Harsha loam, Roxal loam, Lymanson
<br />loam, and Tine cobbly sandy loam are included in map-
<br />ping.
<br />'Typically the Leavitt soil has a grayish brown loam
<br />surface layer about 6 inches thick. The subsoil is brown
<br />clay loam about 28 inches thick. The substratum is pale
<br />brown clay loam that extends to 60 inches or more.
<br />Permeability is moderate. The effective rooting depth
<br />is 60 inches or more. The available water capacity is
<br />high. Surface runoff is medium, and the erosion hazard is
<br />high.
<br />Most of the acreage is rangeland. Part of it is used for
<br />recreation and wildlife. The cold climate and short grow-
<br />ing season limit the production of introduced grasses
<br />and preclude the use of this soil as cropland.
<br />Rangeland vegetation is dominantly western wheat-
<br />grass, muttongrass, Idaho fescue, and big sage.
<br />Grazing management is needed to maintain range
<br />condition. If woody shrubs have become dominant, brush
<br />control is needed. The site is generally too steep to be
<br />seeded with a drill.
<br />This soil provides winter range for mule deer and elk.
<br />Other wildlife include sage grouse, jackrabbit, cottontail,
<br />and coyote. Livestock grazing management and sage-
<br />brush control are necessary to protect the big game
<br />winter range.
<br />The steep slope is the soil feature most limiting to
<br />community development. Road design should provide
<br />drainage outlets for surface runoff.
<br />The capability subclass is Vile.
<br />48— Leiglican gravelly sandy loam, 15 to 70 per-
<br />cent slopes. This deep, well drained, moderately steep
<br />to very steep soil is on mountainsides and ridges at
<br />elevations of 9,500 to 11,400 feet. In a few small areas
<br />the slope is steeper than 70 percent. This soil formed in
<br />material weathered from granite, gneiss, and metamor-
<br />phic schist. The average annual precipitation is about 28
<br />to 36 inches, the average annual air temperature is
<br />about 32 to 37 degrees F, and the frost -free season is
<br />about 10 to 50 days.
<br />Small areas of Upson stony sandy loam, Scout cobbly
<br />sandy loam, and Newcomb gravelly sandy loam are in-
<br />cluded in mapping. A few small areas of Cryaquepts are
<br />also included.
<br />Typically the Leighcan soil has a duff layer about 2
<br />inches thick of needles, twigs, and leaves. It has a sub-
<br />
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