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Pike National Forest, Eastern Part, Colorado, Parts of <br />Douglas, El Paso, Jefferson, and Teller Counties <br />43—Sphinx gravelly coarse sandy loam, 40 to 70 percent <br />slopes <br />Map Unit Setting <br />National map unit symbol:jpjv <br />Elevation:6,000 to 9,500 feet <br />Mean annual precipitation:15 to 25 inches <br />Mean annual air temperature:41 to 48 degrees F <br />Frost-free period:50 to 100 days <br />Farmland classification:Not prime farmland <br />Map Unit Composition <br />Sphinx and similar soils:65 percent <br />Minor components:35 percent <br />Estimates are based on observations, descriptions, and transects of <br />the mapunit. <br />Description of Sphinx <br />Setting <br />Landform:Mountain slopes <br />Landform position (three-dimensional):Mountainflank <br />Down-slope shape:Convex, linear <br />Across-slope shape:Convex, linear <br />Parent material:Weathered from granite <br />Typical profile <br />Oi - 0 to 1 inches:slightly decomposed plant material <br />A - 1 to 5 inches:gravelly coarse sandy loam <br />AC - 5 to 13 inches:very gravelly loamy coarse sand <br />Cr - 13 to 61 inches:weathered bedrock <br />Properties and qualities <br />Slope:40 to 70 percent <br />Depth to restrictive feature:10 to 20 inches to paralithic bedrock <br />Drainage class:Somewhat excessively drained <br />Runoff class:Very high <br />Capacity of the most limiting layer to transmit water (Ksat):Very low <br />to moderately low (0.00 to 0.06 in/hr) <br />Depth to water table:More than 80 inches <br />Frequency of flooding:None <br />Frequency of ponding:None <br />Maximum salinity:Nonsaline to very slightly saline (0.0 to 2.0 <br />mmhos/cm) <br />Available water supply, 0 to 60 inches:Very low (about 0.9 inches) <br />Interpretive groups <br />Land capability classification (irrigated):None specified <br />Land capability classification (nonirrigated):7e <br />Map Unit Description: Sphinx gravelly coarse sandy loam, 40 to 70 percent slopes---Pike <br />National Forest, Eastern Part, Colorado, Parts of Douglas, El Paso, Jefferson, and Teller <br />Counties <br />Natural Resources <br />Conservation Service <br />Web Soil Survey <br />National Cooperative Soil Survey <br />8/22/2025 <br />Page 1 of 3