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Arapaho-Roosevelt National Forest Area, Colorado, Parts of Boulder, <br />Clear Creek, Gilpin, Grand, Park and Larimer Counties <br />4758D—Catamount family-Rubble land-Bullwark family complex, 40 to <br />150 percent slopes <br />Map Unit Setting <br />National map unit symbol: tlyc <br />Elevation: 8,000 to 9,500 feet <br />Mean annual precipitation: 20 to 30 inches <br />Mean annual air temperature: 39 to 43 degrees F <br />Frost-free period: 50 to 70 days <br />Farmland classification: Not prime farmland <br />Map Unit Composition <br />Catamount family and similar soils:40 percent <br />Rubble land:30 percent <br />Bullwark family and similar soils:15 percent <br />Minor components:15 percent <br />Estimates are based on observations, descriptions, and transects of the mapunit. <br />Description of Catamount Family <br />Setting <br />Landform:Mountain slopes <br />Down-slope shape:Linear <br />Across-slope shape:Linear <br />Parent material:Residuum weathered from igneous and metamorphic rock <br />Typical profile <br />Oi - 0 to 1 inches: slightly decomposed plant material <br />A1 - 1 to 2 inches: gravelly loam <br />A2 - 2 to 5 inches: very gravelly sandy loam <br />Bw - 5 to 11 inches: extremely gravelly sandy loam <br />C - 11 to 15 inches: extremely gravelly sandy loam <br />Cr - 15 to 26 inches: bedrock <br />R - 26 to 36 inches: bedrock <br />Properties and qualities <br />Slope:40 to 75 percent <br />Surface area covered with cobbles, stones or boulders:0.0 percent <br />Depth to restrictive feature:10 to 20 inches to paralithic bedrock; 20 to 40 inches <br />to lithic bedrock <br />Drainage class:Excessively drained <br />Runoff class: High <br />Capacity of the most limiting layer to transmit water (Ksat):Very low to moderately <br />low (0.00 to 0.01 in/hr) <br />Depth to water table:More than 80 inches <br />Frequency of flooding:None <br />Frequency of ponding:None <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 />Hydrologic Soil Group: D <br />Custom Soil Resource Report <br />15