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<br />The average annual production of air-dry vegetation is
<br />about 2,500 pounds per acre. If the condition of the
<br />range deteriorates, ovalhead sedge, Baltic rush, Canada
<br />bluegrass, and willow increase. Range seeding is
<br />suitable if the range is in poor condition.
<br />This unit is poorly suited to homesite development.
<br />The main limitations are the hazard of flooding, the
<br />seasonal high water table, and shrink-swell potential.
<br />This map unit is in capability subclasses IVw, irrigated,
<br />and Vw, nonirrigated. It is in Mountain Meadow range
<br />site.
<br />14-Curecanti very cobbly loam, 2 to 8 percent
<br />slopes. This deep, well drained soil is on fans, terraces,
<br />and side slopes. It formed in mixed alluvium. The native
<br />vegetation is mainly grass. Elevation is 7,000 to 8,200
<br />feet. The average annual precipitation is 15 to 17 inches.
<br />the average annual air temperature is 42 to 45 degrees
<br />F, and the average frost-free period is 75 to 100 days.
<br />Typically, the surface layer is dark reddish gray very
<br />cobbly loam about 15 inches thick. The upper part of the
<br />subsoil is very cobbly sandy clay loam about 14 inches
<br />thick, and the lower part is very cobbly sandy loam about
<br />9 inches thick. The substratum to a depth of 60 inches
<br />or more is very cobbly loamy sand. The soil is neutral
<br />throughout.
<br />Included in this unit is about 10 percent Morop loam in
<br />depressional areas. Also included are small areas of
<br />deep sandy loam and gravelly sandy loam along
<br />drainageways.
<br />Permeability of this Curecanti soil is moderate.
<br />Available water capacity is low. Effective rooting depth is
<br />60 inches or more. Runoff is medium, and the hazard of
<br />water erosion is slight.
<br />This unit is used as rangeland.
<br />The potential plant community on this unit is mainly
<br />needleandthread, western wheatgrass, little bluestem,
<br />and big bluestem. The average annual production of air-
<br />dry vegetation is about 1,250 pounds per acre. If the
<br />condition of the range deteriorates, blue grama,
<br />sleepygrass, Gambel oak, and New Mexico locust
<br />increase. Range seeding generally is limited to the
<br />broadcast method because of the large amount of gravel
<br />in the surface layer.
<br />This unit is well suited to homesite development;
<br />however, the large amount of rock fragments in the soil
<br />makes excavation difficult.
<br />This map unit is in capability subclass Vlls,
<br />nonirrigated. It is in Rocky Foothills range site.
<br />15-Denver clay loam, 4 to 25 percent slopes. This
<br />deep, well drained soil is on uplands. It formed in
<br />residuum and colluvium derived dominantly from clayey
<br />shale. The native vegetation is mainly grass. Elevation is
<br />6,600 to 7,200 feet. The average annual precipitation is
<br />15 to 17 inches, the average annual air temperature is
<br />46 to 50 degrees F, and the average frost-free period is
<br />100 to 125 days.
<br />JVII iu, c)
<br />Typically, the surface layer is grayish brown clay loam
<br />about 8 inches thick. The subsoil is clay about 30 inches
<br />thick. The substratum to a depth of 60 inches or more is
<br />clay. The soil is neutral to a depth of 11 inches, mildly
<br />alkaline to a depth of 23 inches, and moderately alkaline
<br />below that depth.
<br />Included in this unit is about 20 percent Razor silty
<br />clay on the steeper side slopes. Also included are small
<br />areas of Goemmer cobbly clay loam.
<br />Permeability of this Denver soil is slow. Available water
<br />capacity is high. Effective rooting depth is 60 inches or
<br />more. Runoff is rapid, and the hazard of water erosion is
<br />high to very high.
<br />This unit is used as rangeland.
<br />.The potential plant community on this unit is mainly
<br />western wheatgrass, green needlegrass, and native
<br />bluegrass. Other grasses that characterize the unit are
<br />needleandthread and blue grama. The average annual
<br />production of air-dry vegetation is about 950 pounds per
<br />acre. If the condition of the range deteriorates, blue
<br />grama, cheatgrass, and gumweed increase. Range
<br />seeding is suitable if the range is in poor condition.
<br />If this unit is used for homesite development, the main
<br />limitations are shrink-swell potential and slow
<br />permeability.
<br />This map unit is in capability subclass Vle,
<br />nonirrigated. It is in Clayey Foothills range site.
<br />16-Farisita very gravelly sandy loam, 10 to 35
<br />percent slopes. This shallow, well drained soil is on
<br />ridges and side slopes. It formed in residuum and
<br />colluvium derived dominantly from sandstone and
<br />conglomerate. The native vegetation is mainly pinyon
<br />and juniper. Elevation is 6,000 to 7,300 feet. The
<br />average annual precipitation is 13 to 17 inches, the
<br />average annual air temperature is 46 to 52 degrees F,
<br />and the average frost-free period is 100 to 130 days.
<br />Typically, the surface layer is brown very gravelly
<br />sandy loam about 4 inches thick. The next layer is
<br />coarse sandy loam about 8 inches thick. The substratum,
<br />to a depth of 24 inches, is soft, weathered sandstone
<br />(fig. 1). Hard sandstone is at a depth of 24 inches. The
<br />soil is neutral throughout.
<br />Included in this unit is about 10 percent moderately
<br />deep Progresso sandy loam in the less sloping areas of
<br />the unit. Also included are small areas of deep Olney
<br />sandy loam in drainageways and on foot slopes.
<br />Permeability of this Farisita soil is moderately rapid.
<br />Available water capacity is very low. Effective rooting
<br />depth is 10 to 20 inches. Runoff is rapid, and the hazard
<br />of water erosion is high to very high.
<br />This unit is used for livestock grazing, woodland, and
<br />wildlife habitat.
<br />The potential plant community is mainly pinyon and
<br />juniper and an understory of big bluestem, little
<br />bluestem, Scribner needlegrass, and Indian ricegrass.
<br />The potential production of the native understory
<br />vegetation in normal years is about 600 pounds of air-dry
<br />vegetation per acre.
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