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<br />
<br />EL PASO COUNTY AREA, COLORADO
<br />700 to 7,400 feet. The average annual precipitation is
<br />about 18 inches, the average annual temperature is about
<br />43 degrees F, and the average frost-free period is about
<br />' 120 days.
<br />Typically, the surface layer is grayish brown loam
<br />about 9 inches thick. The subsoil is brown clay loam about
<br />34 inches thick The substratum to a depth of 60 inches is
<br />' light brownish gray gravelly sandy clay loam.
<br />Included with this soil in mapping are small areas of
<br />Holderness loam, S to 8 percent slopes; Peyton sandy
<br />loam, 5 to 9 percent slopes; and Pring coarse sandy loam,
<br />' 8 to 15 percent slopes.
<br />Permeability of this Holderness soil is slow. Effective
<br />rooting depth is 60 inches or more. Available water
<br />capacity is high. Surface runoff is medium to rapid, and
<br />'the hazard of erosion is moderate. In places where this
<br />soil has been cultivated, erosion is commonly severe.
<br />This soil is well suited to the production of native
<br />vegetation suitable for grazing by cattle and sheep. Na-
<br />tive vegetation is mainly mountain mutely, little bluestem,
<br />needleandthread, Parry oatgrass, and junegrass.
<br />Deferment of grazing in spring helps to maintain the
<br />vigor and reproduction of the cool-season bunchgrasses.
<br />Fencing and properly locating livestock watering facilities
<br />help to control grazing.
<br />This soil is suited to wildlife habitat. It is best suited to
<br />habitat for openland and rangeland wildlife. Rangeland
<br />wildlife, such as pronghorn antelope, can be encouraged
<br />by developing livestock watering facilities, properly
<br />managing livestock grazing, and reseeding range where
<br />needed.
<br />The main limitations of this soil for use as homesites
<br />and for local roads are shrink swell potential and slope.
<br />Construction of septic tank absorption fields is severely
<br />limited by the slow percolation rate of this soil. Special
<br />designs for buildings and local streets are required to
<br />overcome these limitations. Roads need to be designed to
<br />minimize damage from frost heave. Capability subclass
<br />V Ie.
<br />37-Jarre travelly sandy loam, 1 to 8 percent slopes.
<br />This deep, well drained soil formed in alluvium derived
<br />from sandy sediment on alluvial fans or old upland ter-
<br />races. Elevation ranges from 6,700 to 7,500 feet. The
<br />average annual precipitation is about 18 inches, the
<br />average annual air temperature is about 43 degrees F,
<br />,and the average frost-free period is about 120 days.
<br />Typically, the surface layer is dark grayish brown
<br />gravelly sandy loam about 5 inches thick. Coarse frag-
<br />ments cover .5 to 15 percent of [he surface. The subsoil is
<br />brown gravelly sandy clay loam about 17 inches [hick.
<br />The substratum is brown very gravelly sandy loam.
<br />Included with this soil in mapping are small areas of
<br />Jarre-Tecolote complex, 8 to 65 percent slopes; Perrypark
<br />gravelly sandy loam, 3 to 9 percent slopes; and Pring
<br />coarse sandy loam, 3 to 8 percent slopes.
<br />Permeability of this Jarre soil is moderate. Effective
<br />rooting depth is 60 inches or more. Available water
<br />capacity is moderate. Surface runoff is medium to slow,
<br />'and the hazard of erosion is moderate.
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<br />This soil is used as rangeland and for recreation, wil-
<br />dlife habitat, and homesites.
<br />This soil is well suited to the production of native
<br />vegetation suitable for grazing by cattle and sheep. Na-
<br />tive vegetation is mountain mutely, little bluestem, needle-
<br />andthread, Parry oatgrass, and junegrass.
<br />Deferment of grazing in spring helps to maintain the
<br />vigor and reproduction of Che cool-season bunchgrasses.
<br />Fencing and properly locating livestock watering facilities
<br />help to control grazing.
<br />Windbreaks and environmental plantings are suited to
<br />this soil. Available water capacity is the main limitation
<br />for the establishment of tree and shrub plantings.
<br />Summer fallow a year in advance and continued cultiva-
<br />tion for weed control are needed to insure the establish-
<br />ment and survival of plantings. Supplemental irrigation
<br />may also be needed to insure survival. Trees that aze best
<br />suited and have good survival are Rocky Mountain ju-
<br />niper, eastern redcedar, ponderosa pine, and Siberian elm.
<br />Shrubs that are best suited are skunkbush sumac and
<br />lilac.
<br />This soil is suited to wildlife habitat. It is best suited to
<br />habitat for openland and rangeland wildlife. Rangeland
<br />wildlife, such as pronghorn antelope, can be encouraged
<br />by developing livestock watering facilities, properly
<br />managing livestock grazing, and reseeding range where
<br />needed.
<br />This soil has good potential for use as homesites. Its
<br />main limitations are frost-action potential and shrink-
<br />swell potential. Special designs for roads and streets are
<br />needed because of these limitations. A surface dressing of
<br />topsoil is desirable where the very gravelly subsoil is ex-
<br />posed during site preparation. Capability subclass IVe.
<br />3$-Jam-Tecolote complex 8 to fi5 percent scopes.
<br />These moderately sloping to very steep soils are on allu-
<br />vial fans. Elevation ranges from 6,700 to 7,500 feet. The
<br />average annual precipitation is about 18 inches, and the
<br />average annual air temperature is about 4:i degrees F.
<br />The Jarre soil makes up about 40 percent of the com-
<br />plex, the Tecolote soil about 3U percent, and other soils
<br />about 30 percent.
<br />Included with this complex in mapping are areas oC
<br />Jarre gravelly sandy loam, 1 to $ percent slopes; Kettle
<br />gravelly loamy sand, 8 to 40 percent slopes; Kutch clay
<br />loam, 5 to 20 percent slopes; and Chaseville gravelly
<br />sandy loam, 8 to 40 percent slopes.
<br />The Jarre soil is deep and well drained. It formed in al-
<br />luvium derived from sandy sediment. It has slopes of 1 to
<br />30 percent. Typically, the surface layer is dark grayish
<br />brown gravelly sandy loam about 5 inches thick. Coarse
<br />fragments on the surface range from 5 to 15 percent. The
<br />subsoil is brown gravelly sandy clay loam about_17 inches
<br />thick. The substratum to a depth of 60 inches is brown
<br />very gravelly sandy loam.
<br />Permeability of the Jarre soil is moderate. Effective
<br />rooting depth is 60 inches or more. Available water
<br />capacity is moderate. Surface runoff is medium to rapid,
<br />and the hazard of erosion is moderate to high. Typically,
<br />SOILS AND BORING DATA
<br />FIGURE 6.2
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