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Fremont County Area, Colorado
<br />18 inches, the subsoil has a high content of calcium
<br />carbonate.
<br />Included with this soil in mapping are areas of Nunn
<br />soils in open, grassy areas. These soils have a surface
<br />layer of stony loam and have a low content of rock
<br />fragments. They are deep. They make up about 5
<br />percent of the unit. Also included are areas of soils that
<br />are similar to the Curecanti Variant but are moderately
<br />deep. These soils are near cliffs bordering the
<br />pediments. They make up about 5 percent of the unit.
<br />Permeability is slow in the Curecanti Variant.
<br />Available water capacity is low. Effective rooting depth
<br />is 40 to 70 inches. Runoff is slow to rapid, and the
<br />hazard of water erosion is slight to high.
<br />This soil is used as noncommercial woodland or as
<br />rangeland.
<br />The potential plant community is mainly sideoats
<br />grama, big bluestem, little bluestem, and scattered.
<br />areas of pinyon and juniper. The average annual
<br />production of air-dry vegetation is about 1,250 pounds
<br />per acre. If the condition of the range deteriorates,
<br />pinyon, juniper, blue grama, Gambel oak, and red
<br />threeawn increase. The dominant vegetation in some
<br />areas is Gambel oak. Most areas are covered by a
<br />moderately thick stand of pinyon and juniper.
<br />Woodland products, such as firewood, Christmas
<br />trees, and pinyon nuts, are produced in areas of this
<br />soil, but the surface stoniness severely limits access to
<br />these products. Range seeding generally is limited to
<br />broadcast seeding because of the stoniness.
<br />This soil is poorly suited to homesite development. It
<br />is limited mainly by the high content of large stones.
<br />The capability classification is Vlls, nonirrigated. The
<br />soil is in the Cobbly Foothill #213 range site.
<br />30-Dumps and Pits. This map unit consists of large
<br />piles of coal mine tailings and a few areas of pits and
<br />quarries. The groups of piles form a hilly landscape.
<br />The pits are about 10 to 40 acres in size. In sec. 16, T.
<br />19 S., R. 70 W., ore milling wastes are stored in a large
<br />system of tailings ponds.
<br />Most areas of this unit are barren or nearly barren.
<br />Included in mapping are several delineations of
<br />mixed piles and nearly level fill in sec. 5 and sec. 8, T.
<br />19 S., R. 70 W. They are in an old industrial area
<br />consisting mainly of level fill pads and piles of earth and
<br />coal mine spoil. The fill material consists mainly of thin
<br />stratifications of sandy loam, loam, and sand and thin
<br />layers of coal chips. The areas are partially revegetated
<br />with grasses and shrubs. Tall rabbitbrush is a common
<br />shrub.
<br />Delineations of this unit are about 5 to 160 acres in
<br />size.
<br />The capability classification is Vllls.
<br />35
<br />31-Ess very gravelly sandy clay loam, 20 to 45
<br />percent slopes. This deep, well drained soil is on
<br />mountainsides. It formed in colluvium. Slopes are about
<br />200 to 900 feet long. The native vegetation is mainly
<br />grasses and shrubs. Elevation is 8,200 to 9,500 feet.
<br />The average annual precipitation is 16 to 18 inches, the
<br />average annual air temperature is 40 to 44 degrees F,
<br />and the average frost-free period is 55 to 80 days.
<br />The surface layer is typically dark brown very
<br />gravelly sandy clay loam about 12 inches thick. The
<br />subsoil is very gravelly sandy clay loam about 28 inches
<br />thick. The substratum to a depth of 60 inches or more is
<br />very gravelly sandy loam. The soil is neutral to a depth
<br />of 17 inches and is mildly alkaline below that depth.
<br />Included with this soil in mapping are areas of
<br />Bushvalley soils on convex side slopes and in areas
<br />adjacent to rock outcrop. These soils have a surface
<br />layer of cobbly sandy loam. They aie shallow. They
<br />make up about 10 percent of the unit. Also included are
<br />areas of rock outcrop and talus. These areas make up
<br />about 5 percent of the unit. Rock outcrop mainly occurs
<br />as long, narrow cliffs of tuff and ash flows. Also
<br />included are small areas of Ess soils that have a
<br />surface layer of extremely stony loam and that have
<br />some boulders on the surface.
<br />Permeability is moderate or moderately slow in the
<br />Ess soil. Available water capacity is low. Effective
<br />rooting depth is 60 inches or more. Runoff is medium or
<br />rapid, and the hazard of water erosion is high or very
<br />high.
<br />This soil is used as rangeland or for wildlife habitat.
<br />The slope limits access by livestock, and thus
<br />overgrazing is a concern in the less sloping areas.
<br />The potential plant community is mainly mountain
<br />muhly, bottlebrush squirreltail, needleandthread,
<br />nodding bromegrass, true mountainmahogany, and
<br />Gambel oak. The average annual production of air-dry
<br />vegetation is about 1,200 pounds per acre. If the
<br />condition of the range deteriorates, needlegrass,
<br />cheatgrass, rabbitbrush, bottlebrush squirreltail, and
<br />broom snakeweedincrease.
<br />This soil is poorly sui±ed to homesite development. It
<br />is limited mainly by the slope.
<br />The capability classification is Vlle, nonirrigated. The
<br />soil is in the Brushy Mountain Loam. #239 range site.
<br />32-Ess very gravelly loam, 30 to 50 percent
<br />slopes. This deep, well drained soil is on
<br />mountainsides. It formed in colluvium over residuum
<br />derived dominantly from tuff and breccia. The native
<br />vegetation is mainly grasses. Elevation is 9,300 to
<br />11,000 feet. The average annual precipitation is 16 to
<br />20 inches, the average annual air temperature is 38 to
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