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Table 111-2-- Dominant characteristics of soil mapping units of the San Juan River Basin in Arizona, Colorado, New Mexico, and Utah !I 0D168G Group Map symbol Percent of basin Elevation (feet) Mean annual temperature FO) Frost free period da . Plant Cover Type Soil depth Parent materials Slope (percent) Runoff Erosion Hazard Major land uses Potential for irrigation !ligh (YELL"') . .. I 2 4.0 1.0 3 4.0 4,400-6,000 5,000-6,000 4,600-6.000 4,600.6,000 5,000.6,500 5,200~7,000 5.400.7,000 4,800.6.400 6-12 6-10 6-8 6-10 6-10 8-12 6-9 6-12 48-54 51-54 51-54 51-54 51-54 48-53 51-53 51-53 147-178 Grass, Salt Desert Shrub, Northern Desert Shrub 150-167 Grass. Northern Desert Shrub 147.156 Grass, Southern desert Shrub 147-156 147-156 150-178 149-156 150-170 Grass, Southern Desert Shrub Grass, Southern Desert Shrub Grass, Desert Shrub, Pinyon-Juniper Gra88, Northern Desert Shrub Grass, Salt Desert Shrub Deep Deep Deep Deep Deep and roek out~rop Deep to shallow Deep Shallow and deep Alluvial deposits Alluvial deposits Wind deposits or wind-worked materials Wind deposits or wind worked materials Wind deposits or . windworked materials Wind deposits, sandstone and ~hale Sandy alluvial and wind deposits Shale and clayey alluvial deposits 0-5 0-5 3-15 3-15 3-15 0-15 0-15 5-30 Slo", to medium Moderate, mainly gullying Grazing. irrigated cropland High Medium Medium Medium Medium High Low (BRGIN) II 10 11 12 13 14 15 16 17 4 0.5 6,000-7,000 5,800-6.400 6,000-7,500 6,500-7,500 6,500-7,500 6.800-7,000 6,400-7.400 6,800-7.400 6,000-8,000 12-17 12-14 12-16 12-17 12-17 13-15 10-16 14-16 14-17 46-48 48-50 41-48 46-48 41-48 46-48 51-57 46-48 46-48 5 2.0 6 2.5 7 2.0 8 7.5 9 3.5 1.0 2.5 1.0 0.5 0.5 3.0 0.5 2.0 150-158 Northern Desert Shrub, Pinyon- Juniper 100-150 100-150 100-130 100-150 100-158 150-170 .129-158 100-150 No-rthem Desert Shrub, Pinyon- Juniper Grass, Northern Desert Shrub. . Pinyon Juniper Northern Desert Shrub, Pinyon- Juniper Grass. Northern Desert Shrub Northern Desert Shrub. Pinyon- Juniper Pinyon-Juniper Northern Desert Shrub, Mountain Brush - Pinyon-Juniper. Northern Desert Shrub. Montane Foree t Deep and Wind deposits moderately deep Deep and moderately deep Deep and Rockland Deep and moderately deep Shallow to deep Deep to shallow Shallow to deep Deep and moderately deep Deep and moderately deep Wind deposits Wind deposits and sands tone Shale and clayey alluvial deposita Shale and clayey alluvial deposits Shale. sandstone, and alluvial . deposits Shale. sandstone and wind deposits Gravelly and cobbl}' OUI;,,,,ash Residual materials and alluvium from eandstone and red4 beds 1-9 1-9 1-25 3-12 1-25 1-9 3-75 1-15 1-15 Medium Moderate wind and water Graziilg Slow Moderate. "'ind Grazing Medium Moderate. wind Grazing Slow Moderate, wind Grazing Medium Moderate. wind Grazing S low to medium Rapid to slo", Moderate, ",ind Grazing Moderate to high sheet and gully Grazing Medium to rapid Moderate. water and wind Dry and irrigated cropland, grazing Medium to rapid Moderate, wind Dry cropland, grazing S low to medium Moderate. wind and water Grazing Medium Moderate, water Grazing. irrigated and dry cropland Medium to rapid Rapid Moderate. water Grazing Moderate, wind and water Grazing, dry cropland Medium to rapid Ked ium to rapid Moderate ",ind and ",ater Grazing Moderatt:!. wind and water Gra8ing. dry and irrigated cropland Medium Moderate. water grazing III-12 High High Medium Medium Low Med iurn Low Medium Medium