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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1II-2 <br /> <br />SOILS <br />Soils within the Clear Creek Study Area and adjacent to Clear Creek consist <br />primarily of sandy and gravelly alluvium. These alluvial soils are moderate <br />to rapidly permeable, and are subject to periodic flooding in the spring run- <br />off months, April through July. The four main soils groups found adjacent to <br />Clear Creek and its floodplain are Sandy Alluvial Land (SM); Mollic Usti- <br />f1uvents, sandy-skeletal, 0-3 percent Slopes (10S); A1da Loam, 0-2 percent <br />slopes (3A); and Loamy Alluvial Land, gravelly substratum (LV). <br /> <br />Detail ed information pertaining to the soil s, c1 assifi cations and character- <br />istics along Clear Creek was prepared by the U.S. Department of Agriculture, <br />Soil Conservation Service. The information is contained in the Inventory and <br />Evaluation of Soils for Jefferson County, prepared by the Field Office and <br />Soil Survey staff of the U.S.D.A. Soil Conservation Service for the Urban <br />Drainage and Flood Control District, April 4, 1980. <br /> <br />VEGETATION <br />Vegetation adjacent to Clear Creek, on sandy and gravelly alluvial soils con- <br />sists primarily of native grasses, mainly western wheatgrass, saltgrass, blue <br />grama, and switchgrass. Trees in the f1 oodp1 ain area are predOOli nant1 y <br />cottonwoods, willows and various species of brush and pine. This vegetation <br />is largely sustained by the natural water table and by flooding. <br />