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1 <br /> 1 <br /> 2 — Aquolls and Aquents , gravelly substratum. This nearly level <br /> ' map unit is on bottom lands and flood plains of all the major <br /> streams in the survey area . Aquolls , which have a dark colored <br /> surface layer , make up about 60 percent of the unit . Aquents , <br /> which have a lighter colored surface layer , make up about 35 <br /> percent . About 5 percent is Aquepts and Bankard sandy loam. <br /> These are deep , poorly drained soils that formed in recent <br /> alluvium. No one pedon is typical . Commonly the soils have a <br /> mottled, mildly alkaline to moderately alkaline loamy or clayey <br /> surface layer and underlying material and are underlain by sand or <br /> ' sand and gravel within 48 inches . In places they have a gleyed <br /> layer in the underlying material . <br /> Most of the acreage is subject to flooding . The water table is at <br /> or near the surface early in spring and recede to as deep as 48 <br /> inches late in fall in some years . <br /> ' These soils are used for rangeland and wildlife habitat . Some <br /> small areas have been reclaimed by major drainage and leveling and <br /> are used for irrigated crops . <br /> ' The potential native vegetation is dominated by alkali sacaton , <br /> switchgrass , and western wheatgrass . Saltgrass sedge , rush , and <br /> ' alkali bluegrass are also prominent potential production ranges <br /> from 3 , 000 pounds per acre in favorable years to 2 , 000 pounds in <br /> unfavorable years . As range condition deteriorates , the <br /> switchgrass , alkali sacaton, and western wheatgrass decrease and <br /> saltgrass sedge , and rush increase . <br /> These soils have good potential as a source of sand and gravel . <br /> Capability subclass VIw; Salt Meadow range site . <br /> 3— Heldt silty clay. 1 to 3 percent slopes . This is a deep , <br /> moderately well drained soil on plains at elevations of 4 , 950 to <br /> 5 , 050 feet . It formed in alluvial sediment derived from shale . <br /> Included in mapping are small areas of soils that have a clay loam <br /> or silt loam subsoil and substratum. <br /> Typically the surface layer is light brownish gray and light <br /> yellowish brown silty clay about 7 inches thick. The subsoil is <br /> ' light brownish gray silty clay about 27 inches thick. The <br /> substratum to a depth of 60 inches is silty clay . <br /> ' Permeability is slow. Available water capacity is high . The <br /> effective rooting depth is 60 inches or . more . Surface runoff is <br /> medium, and the erosion hazard is moderate . <br /> Iu irrigated areas this soil is suited to crops commonly grown in <br /> the area , such as corn , sugar beets , beans , alfalfa , and small <br /> grain. The high clay content generally restricts some crops . <br /> ' I-2 <br />