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37 - Cochetopa loam, 12 to 25 percent slopes <br />Map Unit Setting <br />Major Land Resource Area: 48A <br />Elevation: 7,200 to 8,300 feet (2,195 to 2,530 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 />Cochetopa and similar soils: 85 percent <br />Minor components: 15 percent <br />Component Descriptions <br />Cochetopa soils <br />Landform: Mountainsides <br />Parent material. Residuum derived from sandstone and <br />shale <br />Slope: 12 to 25 percent <br />Drainage Class: Well drained <br />Slowest permeability. .06 to 0.2 in./hr. (slow) <br />Available water capacity. About 11 inches (high) <br />Shrink -swell potential: About 7.5 percent (moderate) <br />Hazard of flooding: None <br />Cochetopa Series <br />Map Unit: 37 <br />Local Phase: warm <br />Depth class: very deep <br />Drainage Class: Well drained <br />Landform: Hills, mountainsides, plateaus, concave portions <br />on plateaus <br />Position on landform: backslopes, footslopes <br />Parent material. colluvium derived from shale, loess and <br />residuum derived from shale, residuum derived from <br />sandstone and shale, residuum derived from shale, <br />Elevation: 7,000 to 8,600 feet (2,134 to 2,621 meters) <br />Slope: 3 to 65 percent <br />Climatic data: <br />Mean annual precipitation: 16 to 20 inches (406 <br />to 508 millimeters) <br />Mean annual air temperature: 37 to 40 degrees <br />F (2.8 to 4.4 degrees C) <br />Frost -free period. 50 to 75 days <br />Taxonomic class: Fine, montmorillonitic Argic Pachic <br />Cryborolls <br />Typical Pedon- - - <br />Map Unit in which located. Cochetopa loam, 3 to 12 percent <br />slopes <br />Al - 0 to 4 inches; very dark grayish brown (10YR 3/2) loam, <br />very dark gray (10YR 2/2) moist; moderate fine granular <br />structure; soft, very friable, nonsticky and nonplastic; <br />neutral; gradual wavy boundary. <br />A2 - 4 to 11 inches; dark grayish brown (10YR 4/2) loam, <br />very darn grayish brv'v5in (iOYR 2/2) iiwi�t; :veUk iiivva`�.ratiiy- <br />fine angular blocky structure parting to moderate fine <br />granular; slightly hard, friable, slightly sticky and slightly <br />plastic; neutral; clear wavy boundary. <br />Depth to seasonal high water table: Greater than <br />72 inches <br />Runoff class: Very 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: slender wheatgrass, <br />Letterman's needlegrass, mountain big <br />sagebrush, elk sedge, mountain brome, mountain <br />snowberry, nodding brome <br />Land capability subclass: (nonirrigated) 6e <br />Typical profile <br />0 to 11 inches - loam <br />11 to 19 inches - clay loam <br />19 to 48 inches - clay loam <br />48 to 60 inches - clay loam <br />Minor Components <br />Jerry and similar soils <br />Composition: About 8 percent <br />Routt and similar soils <br />Composition: About 7 percent <br />BA - 11 to 19 inches; dark grayish brown (10YR <br />4/2) clay loam, very dark brown (10YR 2/2) moist; <br />moderate medium and coarse subangular blocky <br />structure; hard, friable, sticky and plastic; neutral; <br />Btl - 19 to 32 inches; brown (7.5YR 4/4) clay <br />loam, dark brown (7.5YR 4/4) moist; moderate <br />medium prismatic structure parting to strong <br />medium angular blocky; hard, firm, very sticky and <br />plastic; common distinct clay films on faces of <br />peds; neutral; clear smooth boundary. <br />Bt2 - 32 to 48 inches; brown (7.5YR 5/4) clay <br />loam, dark brown (7.5YR 4/4) moist; moderate <br />medium prismatic structure parting to strong <br />medium angular blocky; hard, firm, very sticky and <br />plastic; common distinct clay films on faces of <br />peds and along interstitial pores; neutral; gradual <br />smooth boundary. <br />BC - 48 to 60 inches; yellowish brown (10YR 5/4) <br />clay loam, dark yellowish brown (10YR 4/4) moist; <br />weak medium prismatic structure parting to weak <br />medium subangular block structure; hard, friable, <br />sticky and plastic; neutral. <br />Range in Characteristics <br />Particle -size control section (weighted average): <br />Rock fragment content: 0 to 15 percent <br />Thickness of the mollic epipedon: 16 to 24 inches <br />Bt horizon: <br />Hue: 10 YR or 7.5 YR - <br />Texture: clay loam or clay <br />Reaction: neutral to slightly acidic <br />BC horizon: <br />Texture: clay loam or clay <br />Reaction: sliqhtiv acidic or neutral <br />