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<br />ore. Organic matter content is high. Surface runoff is
<br />and the erosion Lazard is slight. This soil is occa-
<br />ally flooded for brief periods between April and Sep-
<br />. nber.
<br />his soil is used mainly for grazing, wildlife habitat, and
<br />ed irrigated hay. Good management of water and
<br />tzar maintains or improves the production of native
<br />3y
<br />~,he native vegetation on this soil is mainly wildrye,
<br />atgrass, needlegrass, and small amounts of forbs
<br />shrubs.
<br />When range condition deteriorates, dandelion, yarrow,
<br />itbrush, big sagebrush, and Kentucky bluegrass in-
<br />se. Properly managing grazing maintains and im-
<br />oves range condition. Basin wildrye, slender wheat-
<br />a~s, and western whealgrass are suitable for seeding.
<br />aring a seedbed and drilling the seed are good
<br />~tices. Fencing protects this more productive soil.
<br />ti s soil is lower than surrounding soils and usually con-
<br />=s the water supply for livestock. Reducing brush im-
<br />es the range.
<br />ule deer, snowshoe hare, elk, coyote, and blue
<br />-ouse find habitat on this soil.
<br />ommunity development is limited by flooding. This
<br />is a good source of topsoil.
<br />his soil is in capability subclass Vle, nonirrigated.
<br />~t-Tanna silty clay loam, 25 to 45 percent slopes.
<br />moderately deep, well drained soil is on mountain-
<br />des. Elevation ranges from 6,500 l0 7,600 feet. This
<br />loaned in material weathered from shale. The aver-
<br />annual precipitation is about 17 inches, the average
<br />ual air temperature is about 43 degrees F, and the
<br />rerage frost-free period is about 100 days.
<br />yptcally, the surtace layer is grayish brown silty clay
<br />about 9 inches thick. The subsoil is light brownish
<br />ay clay and light gray silty clay about 15 inches thick.
<br />ie substratum is light gray channery clay loam about 6
<br />es thick. Weathered shale is at a depth of 30 inches.
<br />cluded with this soil in mapping are small areas of
<br />o lard clay and shale outcrop on steep and very steep
<br />~~uuntainsides. These areas make up 10 to 15 percent
<br />~he map unit.
<br />ermeability is slow, and available water capacity is
<br />w. Effective rooting depth is 20 to 40 inches. Surface
<br />fl is rapid, and the erosion hazard is severe.
<br />his soil is used mainly for wildlife habitat and limited
<br />azrng.
<br />The native vegetation on this soil is mainly Gambel
<br />serviceberry, snowberry, and elk sedge.
<br />hen range condition deteriorates, forbs and shrubs
<br />;rease. When the range is in poor condition, Kentucky
<br />grass, weeds, and annual plants are numerous.
<br />~perly managing grazing maintains and improves
<br />~jje condition.
<br />Mule deer, wild turkey, and cottontail rabbit find habitat
<br />(this soil.
<br />SOIL SURVEY
<br />Use of this soil for community development, for sani-
<br />tary facilities, and as a source of construction material is
<br />limited by steep slopes, high clay content, low strength,
<br />depth to bedrock and shrink-swell potential. Road con-
<br />struction and building foundations can be designed to
<br />reduce the effects of shrinking and swelling. A good
<br />drainage system reduces soil slumping.
<br />Tpis soil is in capability subclass Vlle, nonirrigated.
<br />65-Torrlfluvents, nearly level. This broadly defined
<br />unit consists of deep, well drained to somewhat poorly
<br />drained, nearly level soils on flood plains adjacent to the
<br />Colorado and Roaring Fork Aivers and their major tribu-
<br />taries. Slope is 0 to 6 percent. The soils formed in
<br />alluvium.
<br />These soils are stratified and vary widely in texture
<br />and depth. The surtace layer ranges from loamy sand
<br />and tine sandy loam to silty loam and clay loam. The
<br />underlying layers are generally sandy loam or loam strati-
<br />fied with sand, gravel, and cobbles. In some areas gravel
<br />and cobbles are on or near the surface.
<br />The water table fluctuates between depths of 2 and 4
<br />test and in some years is near the surface during spring
<br />runoff from snowmelt. These soils are subject to brief,
<br />occasional flooding late in spring and early in summer.
<br />Included in mapping are small isolated areas of Wann
<br />soils that have slopes of 1 to 3 percent. Small areas of
<br />soils that are moderately to severely affected by alkali
<br />are identified by an alkali spot symbol. Small, isolated
<br />areas where water stands at or near the surtace all year
<br />are identified by wet spot and marsh spot symbols.
<br />These areas make up 15 percent of the map unit.
<br />These soils are used for wildlife habitat, recreation,
<br />and some grazing.
<br />The native vegetation is mainly cottonwood, willow,
<br />tamarisk and water-tolerant grasses, sedges, and rushes.
<br />In many areas these soils are suited to production of
<br />Fremont cottonwood. The soils are capable of producing
<br />230 board feet of timber per acre from a fully stocked,
<br />even-aged stand of 40-year-old trees.
<br />Where these soils are accessible, they provide shelter
<br />and forage far livestock.
<br />Mule deer, cottontail rabbit, coyote, bobcat, ducks,
<br />geese, and other native birds find food and shelter on
<br />these soils. Where feasible, planting food plots, trees
<br />and shrubs, and nesting cover enhances the habitat for
<br />upland wildlife. Where the water table is high, open
<br />water for waterfowl and fish can be developed by blast-
<br />ing or by excavating.
<br />These soils have potential for recreation. Wildlife is
<br />abundant, and the nearby rivers can be used for ratting
<br />and canoeing. Community development is very limited by
<br />flooding, the seasonal high water table, and variable
<br />texture. Onsite investigation is necessary.
<br />These soils are in capability subclass Vllw, nonirrigat-
<br />ed.
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