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Map Unit Setting <br />Major Land Resource Area: 35 <br />Elevation: 5,500 to 6,800 feet (1,676 to 2,073 meters) <br />Mean annual precipitation: 12 to 14 inches (305 to 356 millimeters) <br />Average annual air temperature: 46 to 48 degrees F (8 to 9 degrees C) <br />Frost free period: 110 to 130 days <br />Map Unit Composition <br />Progresso and similar soils: 85 percent <br />Minor components: 15 percent <br />Component Descriptions <br />Progresso soils: <br />Landform: Mesa, structural bench, old terrace <br />Parent material: Alluvium derived from sandstone <br />Slope: 3 to 6 percent <br />Depth to restrictive feature: 20 to 40 inches to bedrock (lithic) <br />Drainage Class: Well drained <br />Slowest permeability: Moderately slow <br />Available water capacity: About 4.7 inches (low) <br />Shrink -swell potential: About 4.5 percent (moderate) <br />Hazard of flooding: None <br />Depth to seasonal high water table: Greater than 72 inches <br />Runoff class: High <br />Calcium carbonate maximum: About 35 percent <br />Salinity maximum: About 2 mmhos/cm (nonsaline) <br />Ecological site: Semidesert Loam <br />Potential native vegetation: galleta, Indian ricegrass, Wyoming big sagebrush, muttongrass, <br />western wheatgrass, rabbitbrush <br />Land capability subclass: (irrigated) 3e <br />Land capability subclass: (nonirrigated) 4c <br />Typical profile <br />0 to 7 inches - loam <br />7 to 14 inches - clay loam <br />14 to 24 inches - clay loam <br />Section 2.04.9 Page 14 Sept. 2015 (TR -11) <br />