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~... ... .. u.~~ y,.~ ._, ... ... ... _ . .. <br />1.: ~:w ~.:::~ ~-:: ~..::. _. .. <br />~^ ' 34~ ~1Y6-A~ <br />.3 - Aquolls and Agc~[s, y,ravel~ substratum <br />~ ' ` <br />.+~ ` :. <br />i <br />1 <br />r.i :;:,1 <br />_ :~ <br />II~'. 1 , <br />c;:.;"" ; <br />...::' <br />'~': ~_ <br />~+~i <br />I <br />'fhr.sc nearly level soils arc on bo[trnn lanJs and flood plains of all <br />the mayor streams in the survey area. The Aquulls, which hnvc dark <br />colored surface layers, make up about 65 percent of the mapping unit. <br />The Aquents, which have lighter colored surface layers, make up about <br />25 percent. About t0 percent is Aquolls and Aqucp[s, flooded, and <br />Bankard sandy loam, <br />These arc deep, poorly drained soils. They formed in recent alluvium <br />Typically they leave mottled, mildly to moderately alkaline, loamy or <br />clayey surface layers and underlying material, and are underlain by <br />sand or sand and gravel within 48 inches. Tltey may or may no[ have a <br />gieycd layer in the underlying material, <br />Pfost of Chese soils are subject to flooding, A a~atertable is at or <br />near the surface early in the spring and recedes to as deep as 48 <br />inches by late fait in some years. <br />These soils arc used for rangeland and wildlife habitat. Some smati <br />areas have been reclaimed by major drainage and ]eve ling operations <br />1 <br />it ; <br />~. ~~ <br />and is farmed to irrigated crops. <br />The potential native vegetation on these soils is dominated by alkali <br />sacaton, switchgrass and western wheatgrass. Snltgrass, sedge, rush <br />and alkali bluegrass are also prominent. Potential production ranges <br />from 3000 pounds per acre in favorable years [0 2000 pounds per acre <br />in unfavorable years. When range condition deteriorates, swi[chgrass, <br />