LOCATION FIVEMILE WY+NM NVEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, calcareous, mesic Typic Torrifluvents
TYPICAL PEDON: Fivemile silty clay loam, cultivated. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 5 inches; light brownish gray (10YR 6/2) silty clay loam, grayish brown (10YR 5/2) moist; moderate fine granular structure; soft, very friable, moderately plastic; calcareous; moderately alkaline (pH 8.2); gradual wavy boundary. (4 to 6 inches thick)
C--5 to 60 inches; grayish brown (10YR 5/2) stratified silty clay loam, silt loam, loam, clay loam, and very fine sandy loam, dark grayish brown (10YR 4/2) moist; massive; slightly hard, very friable, moderately plastic; calcareous; moderately alkaline (pH 8.2). (Several feet thick)
TYPE LOCATION: Fremont County, Wyoming; 160 feet west and 70 feet north of the E1/4 corner of sec. 4, T.3N., R.2E.
RANGE IN CHARACTERISTICS: The content of organic carbon ranges from .2 to .8 percent in the surface horizons and decreases irregularly with depth. Calcium carbonate equivalent is 1 to 10 percent. Visible secondary calcium carbonate accumulation may occur but is not concentrated into a definite continuous horizon and may occur at any depth within the control section. The control section is typically silty clay loam but clay ranges from 18 to 35 percent, silt from 40 to 70 percent, and sand from 10 to 35 percent with less than 15 percent fine or coarser sand. The content of gravel ranges from 0 to 5 percent but is commonly less than 1 percent. Mean annual soil temperature ranges from 47 degrees to 53 degrees F. and mean summer soil temperature from 60 degrees to 68 degrees F. The A horizon has hue of 10YR or 7.5YR, value of 5 through 7 dry, 4 or 5 moist, and chroma of 1, 2 or 3. It is moderately or strongly alkaline (pH 8.0 to 8.6) and is generally calcareous throughout although it may be leached for a few inches in some pedons. This horizon has fine granular or crumb structure. It is soft to slightly hard. The C horizon has fine granular or crumb structure. It is soft to slightly hard. The C horizon has hue of 10YR or 7.5YR, value of 5, 6 or 7 dry and chroma of 1, 2 or 3. It is moderately or strongly alkaline (pH 8.0 to 9.0). It contains 4 to about 10 percent calcium carbonate equivalent. This horizon is stratified with individual strata varying in texture and content of organic carbon.
COMPETING SERIES: These are the Billings, Slaw, Slawha, and Tours series. Billings soils have hue no redder than 2.5Y, and have mean annual soil temperature warmer than 51 degrees F. Slaw soils have an average annual soil temperature of 53 to 57 degrees F. Slawha soils have less than 4 percent calcium carbonate equivalent in the C horizon. Tours soils have hue of 5YR or redder.
GEOGRAPHIC SETTING: Fivemile soils are on nearly level to gently sloping flood plains and alluvial fans. Slopes gradients typically range from 0 to about 6 percent. The soils formed in thick, stratified but predominantly silty, calcareous alluvial sediments derived principally from sedimentary rock in Wyoming and from mixed rocks in Nevada. The average annual precipitation is 4 to 9 inches. The mean annual temperature is 43 degrees to 47 degrees F. The average summer temperature is about 66 degrees F. The frost-free season is 120 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Binton soils and the Glenton and Lostwells soils. Glenton soils have a coarse-loamy control section. Lostwells soils have a fine-loamy control section.
DRAINAGE AND PERMEABILITY: Well-drained; slow runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used as native pastureland and they are also used extensively for irrigated crops. Principal native plants are Gardner saltbush, greasewood, bluestem wheatgrass, and bottlebrush squirreltail.
DISTRIBUTION AND EXTENT: Basin areas of central and northern Wyoming and valleys in central Nevada. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Fremont County (Riverton Irrigated Area), Wyoming, 1969.