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33 - Clayburn loam, warm, 3 to 25 percent slopes <br />Map Unit Setting <br />Major Land Resource Area: 48A <br />Elevation: 7,000 to 8,600 feet (2,134 to 2,621 meters) <br />Mean annual precipitation: 18 to 20 inches (457 to 508 <br />millimeters) <br />Average annual air temperature: 37 to 40 degrees F (2.8 to <br />4.4 degrees C) <br />Frost -free period: 50 to 75 days <br />Map Unit Composition <br />Clayburn and similar soils: 85 percent <br />Minor components: 15 percent <br />Component Descriptions <br />Clayburn soils <br />Landform: Plateaus, mountainsides <br />Parent material: Colluvium and residuum derived from <br />sandstone and shale <br />Slope: 3 to 25 percent <br />Drainage Class: 0.2 to 0.6 in./hr. (moderately slow) <br />Slowest permeability: Moderate <br />Available water capacity: About 10.6 inches (high) <br />Shrink -swell potential: About 4.5 percent (moderate) <br />Hazard of flooding: None <br />Clayburn Series <br />Map Unit. 33 <br />Local Phase: warm <br />Depth class: very deep <br />Drainage Class: Well drained <br />Slowest permeability. 0.2 to 0.6 in./hr. (Moderately slow) <br />Landform: drainageways, mountainsides, plateaus <br />Position on landform: backslopes, footslopes <br />Parent material. colluvium and residuum derived from <br />interbedded shale and sandstone <br />Elevation: 7,000 to 9,000 feet (2,134 to 2,743 meters) <br />Slope: 3 to 55 percent <br />Climatic data: <br />Mean annual precipitation: 16 to 20 inches (406 to 508 <br />millimeters) <br />Mean annual air temperature: 37 to 40 degrees F (2.8 to <br />4.4 degrees C) <br />Frost -free period. 50 to 75 days <br />Taxonomic class. Fine -loamy, mixed Argic Pachic Cryborolls <br />Typical Pedon <br />Map Unit in which located. Clayburn loam, 3 to 25 percent <br />slopes <br />Al - 0 to 4 inches; grayish brown (10YR 5/2) loam, very dark <br />gray (10YR 3/1) moist; moderate fine granular structure; <br />soft, very friable, slightly sticky and slightly plastic; neutral; <br />clear smooth boundary. <br />A2 - 4 to 11 inches; grayish brown (10YR 5/2) loam, very <br />dark grayish brown (10YR 3/2) moist; moderate very fine <br />subangular blocky structure; slightly hard, friable, slightly <br />sticky and slightly plastic; neutral; clear smooth boundary <br />BA - 11 to 17 inches; grayish brown (10YR 5/2) clay loam, <br />very dark grayish brown (10YR 3/2) moist; strong fine <br />angular blocky structure; hard, friable, sticky and plastic; <br />neutral; clear smooth boundary. <br />Depth to seasonal high water table: Greater than <br />72 inches <br />Runoff class: High <br />Calcium carbonate maximum: None <br />Gypsum maximum: None <br />Salinity maximum: About 0 mmhos/cm (nonsaline) <br />Sodium adsorption ratio: About O (nonsodic) <br />Ecological site: Mountain Loam <br />Potential native vegetation: Letterman's <br />needlegrass, slender wheatgrass, mountain big <br />sagebrush, Saskatoon serviceberry, elk sedge, <br />mountain brome, mountain snowberry, nodding <br />brome <br />Land capability subclass: (nonirrigated) 6e <br />Typical profile <br />0 to 11 inches - loam <br />11 to 46 inches - clay loam <br />46 to 60 inches - loam <br />Minor Components <br />Routt and similar soils <br />Composition: About 8 percent <br />Jerry and similar soils <br />Composition: About 7 percent <br />Btl - 17 to 32 inches; brown (10YR 5/3) clay loam, <br />dark yellowish brown (10YR 4/4) moist; strong <br />medium and coarse angular blocky structure; very <br />hard, firm, sticky and plastic; many distinct clay <br />films on faces of peds; neutral; clear wavy <br />boundary. <br />Bt2 - 32 to 40 inches; light yellowish brown (10YR <br />6/4) clay loam, dark yellowish brown (10YR 4/4) <br />moist; grayish brown (10YR 5/2) coatings on peds; <br />moderate very coarse angular blocky structure; <br />very hard, firm, sticky and plastic; distinct clay <br />films on faces of peds; neutral; gradual wavy <br />boundary. <br />BC - 40 to 46 inches; brownish yellow (10YR 6/6) <br />clay loam, yellowish brown (10YR 5/6) moist; <br />weak very coarse subangular blocky structure; <br />very hard, firm, sticky and plastic; neutral; gradual <br />wavy boundary. <br />C - 46 to 60 inches; brownish yellow (10YR 5/6) <br />loam, yellowish brown (10YR 5/6) moist; massive <br />structure; very hard, firm, sticky and plastic; mildly <br />alkaline. <br />Range in Characteristics <br />Particle -size control section (weighted average): <br />Rock fragment content. 0 to 15 percent <br />Depth to argillic horizon: 40 to 50 inches <br />A horizon: <br />Reaction: neutral to slightly acidic <br />Bt horizon: <br />Hue: 7.5 YR or 10 YR <br />Texture: clay loam or sandy clay loam <br />Reaction: neutral to slightly acidic <br />C horizon: <br />Hue: 7.5 YR or 10 YR <br />Texture: gravelly loam, fine sandy loam, or loam <br />Reaction: slightly acidic to mildly alkaline <br />