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~-_ • <br />/-~ 6/ 82 <br />1 Va~~an~ <br />93A--Eachuston^loam, 0 to 3 percent slopes. This deep, poorly <br />drained soil is on stream terraces and alluvial valley floors. It formed in <br />mixed alluvium. Elevation is 6,300 to 6,800 Feet. The average annual <br />precipitation is 18 to 25 inches, the average annual air temperature is 37 to <br />4U degrees F, and the average frost-free period is 40 to 65 days. <br />Ty~ically,_ Ghe_snLf,ace..is. coveLed_ with_a mat of partially dernmR~ed <br />leases-3nd_s_t.ems 1 inch thick. The surface layer is dark grayish brown loam <br />2 inches thick. The upper 8 inches of the underlying material is stratified <br />light brownish gray sand.and dark grayish brown loamy_ sand. The lower part <br />to a depth of 60 inches is light yellowish brown extremely gravelly sand. <br />Included in this unit are small areas of a soil similar to the Eachuston <br />soil but the underlying material is sand or loamy sand. <br />~ Permeability of this Eachuston soil is rapid. Available water capacity <br />is very low. Runoff is slow or ponded, and the hazard of water erosion is <br />slight or none. A seasonal high water table is at a depth of 5 to 15 inches <br />in May an_ d June. The water table is at about 30 inches the remainder of the <br />year. This soil is subject to frequent long periods of flooding in May ana <br />June. <br />This unit is used for livestock grazing and wildlife habitat. <br />The potential plant community is mainly narrowleaf cottonwoods and an <br />understory of Kentucky bluegrass, timothy, smooth brome, red top and western <br />wheatgrass. Other plants that characterize this site are willows, wood rose <br />and currant. The average annual production of air-dry vegetation is about <br />2,800 pounds per acre. <br />Management practices suitable for use on this soil are proper range use, <br />deferred grazing, rotation grazing and brush control. <br />