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163 - Rock River sandy loam, 12 to 25 <br />Map Unit Setting <br />Major Land Resource Area: 34 <br />Elevation: 6,200 to 7,300 feet (1,890 to 2,225 <br />meters) <br />Mean annual precipitation: 11 to 13 inches (279 to <br />330 millimeters) <br />Average annual air temperature: 42 to 45 degrees F <br />(5.6 to 7.2 degrees C) <br />Frost -free period. 75 to 95 days <br />Map Unit Composition <br />Rock River and similar soils: 85 percent <br />Minor components: 15 percent <br />Component Descriptions <br />Rock River soils <br />Landform: Hillslopes <br />Parent material. Residuum derived from sandstone <br />Slope: 12 to 25 percent <br />Drainage Class: Well drained <br />Slowest permeability. 0.6 to 2.0 in./hr. (moderate) <br />Available water capacity. About 7.5 inches <br />(moderate) <br />Shrink -swell potential. About 1.5 percent (low) <br />Hazard of flooding: None <br />Rock River Series <br />Map Unit. 163 <br />Depth class: very deep <br />Drainage Class: well drained <br />Landform: alluvial fans, benches, hillslopes, <br />plateaus, convex positions on plateaus <br />Parent material. eolian deposits and in alluvium <br />derived from sandstone, eolian deposits and <br />residuum derived from sandstone and residuum <br />derived from sandstone <br />Elevation: 6,000 to 7,300 feet (1,829 to 2,225 <br />meters) <br />Slope: 0 to 25 percent <br />Climatic data: <br />Mean annual precipitation: 11 to 13 inches <br />(406 to 457 millimeters) <br />Mean annual air temperature: 42 to 45 <br />degrees F (5.6 to 7.2 degrees C) <br />Frost -free period. 75 to 95 days <br />Taxonomic class: Fine -loamy, mixed Borollic <br />Haplargids <br />Typical Pedon- <br />Map Unit in which located. Rock River sandy loam, <br />3 to 12 percent slopes <br />A - 0 to 3 inches; dark yellowish brown (10YR 414) <br />sandy loam, very dark brown (10YR 3/3) moist; <br />weak medium platy structure; soft, very friable, <br />slightly sticky and slightly plastic; few fine roots; <br />neutral; abrupt smooth boundary. <br />011 J lV 7 inctlles; brown (7.5YR 5/4) sandy clay <br />loam, dark brown (7.5YR 4/4) moist; weak coarse <br />subangular blocky structure; hard, firm, sticky and <br />plastic; few fine roots; very few faint <br />clay films on faces of peds and in root channels; <br />neutral; clear smooth boundary. <br />Depth to seasonal high water table: Greater than 72 <br />inches <br />Runoff class: Medium <br />Calcium carbonate maximum: About 15 percent <br />Gypsum maximum: None <br />Salinity maximum: About 2 mmhos/cm (nonsaline) <br />Sodium adsorption ratio: About 0 (nonsodic) <br />Ecological site: Rolling Loam <br />Potential native vegetation: Wyoming big sagebrush, <br />needle and thread, Indian ricegrass, western wheatgrass, <br />Nevada bluegrass, bottlebrush squirreltail, prairie <br />junegrass <br />Land capability subclass: (nonirrigated) 6e <br />Typical profile <br />0 to 3 inches - sandy loam <br />3 to 22 inches - sandy clay loam <br />22 to 32 inches - sandy clay loam <br />32 to 60 inches - sandy loam <br />Minor Components <br />Forelle and similar soils <br />Composition: About 8 percent <br />Berlake and similar soils <br />Composition: About 7 percent <br />Bt2 - 7 to 16 inches; light brown (7.5YR 6/4) sandy clay <br />loam, brown (7.5YR 4/4) moist; weak coarse prismatic <br />structure parting to moderate medium subangular blocky; <br />few faint clay films on faces of peds; mildly alkaline; <br />gradual smooth boundary. <br />Bt3 - 16 to 22 inches; light yellowish brown (10YR 6/4) <br />sandy clay loam, yellowish brown (10YR 5/4) moist; weak <br />coarse subangular blocky structure; hard, firm, sticky and <br />plastic; few fine and medium roots in the upper portion of <br />the horizon; few faint clay films on faces of peds; mildly <br />alkaline; clear smooth boundary. <br />Bk1 - 22 to 32 inches; light yellowish brown (10YR 6/4) <br />sandy clay loam, light yellowish brown (10YR 6/4 moist; <br />massive; hard, firm, sticky and slightly plastic; strongly <br />effervescent; moderately alkaline; gradual smooth <br />boundary. <br />Bk2 - 32 to 60 inches; very pale brown (10YR 7/4) sandy <br />loam, pale brown (10YR 5/3 moist; massive; hard, friable, <br />slightly sticky and slightly plastic; strongly effervescent; <br />moderately alkaline. <br />Range in Characteristics <br />Depth to argillic horizon: 15 to 25 inches <br />Depth to effervescence: 15 to 30 inches <br />Bt horizon: <br />Hue: 7.5YR to 10YR <br />Bk1 horizon: <br />Hu.-: ?.SYR or lnVD <br />Texture: sandy loam or sandy clay loam <br />Bk2 horizon: <br />Texture: sandy loam or sandy clay loam; some <br />pedons have a texture of loamy sand below a <br />depth of 40 inches <br />