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<br />:( <br /> <br />" <br /> <br />SOILS <br /> <br />. <br /> <br />The general soil map locates soils with similar characteristics and <br />suitability within the basin. See Plate 3. Broad characteristics and <br />relationships can then be used to interpret the potential of soils for <br />agricultural, recreational, commercial and Industrial uses. Problems of <br />erosion, sediment yield, land use, and future development are inter- <br />related with soils and their distribution. <br /> <br />The General Soils Map was prepared by delineating 20 mapping units that <br />differ from each other in the kinds of soil that are present. Soils in <br />each mapping unit form patterns that are repeated from place to place. <br /> <br />Mapping units were defined and described according to requirements <br />Imposed by the map scale and criteria from "Soil Taxonomy" published <br />December 1975. The soil map unit numbers in this report correspond to <br />the soil map unit numbers of "Soils of Colorado" published July 1977. <br /> <br />Soils association numbers were used by the work group in preparation of <br />mini reports and computer models. Since this time, Colorado has pub- <br />1 ished a new Colorado State General Soils Map. The Index for Soils Maps <br />(Table A-I) shows the relationship of the soil association numbers to <br />the new mapping units. <br /> <br />Soil mapping units were placed In seven major groups for purposes of <br />broad interpretation. Dominant characteristics of each mapping unit are <br />given in Table A-2. <br /> <br />Group I (Green) Map Unit I - Typic Cryoboralfs, skeletal--Rock Outcrop, <br />sloping to steep. <br /> <br />. <br /> <br />This map unit constitutes 25 percent of the basin. These soils occupy <br />timbered mountain slopes, high plateaus, mesas, sparsely vegetated <br />escarpments and rock outcrops. Valleys are narrow and inextensive. <br />Slopes are frequently broken by ledges and escarpments. The soils <br />formed in materials weathered from a variety of crystalline and sedi- <br />mentary rocks. <br /> <br />Elevations range from 7,500 to 11,500 feet (2,286 to 3,505 m). Slopes <br />commonly range from 5 to 65 percent but areas of rock outcrop may have <br />escarpments or canyon walls with almost vertical cliffs. The annual <br />precipitation ranges from about 20 to 40 inches (0.51 to 1.02 m) and <br />most of it comes as snow. The mean annual soil temperature is about 35 <br />to 45 degrees F. (1.7 to 7.20 C) and the frost free season is about 0 to <br />75 days. This map unit covers about 1,207,000 acres (488,473 hal, _ <br />1,886 square miles (4,885 km2). <br /> <br />(' C . <br /> <br />,... .... <br />..> ~'t <br /> <br />A-I <br />