LOCATION WILSONVILLE WY+MTEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, nonacid Mollic Cryofluvents
TYPICAL PEDON: Wilsonville fine sandy loam, cultivated. (Colors are for dry soil unless otherwise stated.
Ap--O to 7 inches; grayish brown (10YR 5/3) fine sandy loam, dark grayish brown (10YR 3/3) moist; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; slightly alkaline (pH 7.8); clear smooth boundary. (7 to 10 inches thick)
C1--7 to 23 inches; light brownish gray (10YR 6/2) fine sandy loam, dark grayish brown (10YR 4/2) moist; weak medium subangular blocky structure; soft, very friable; slightly alkaline (pH 7.6); clear smooth boundary. (10 to 30 inches thick)
C2--23 to 29 inches; light brownish gray (10YR 6/2) very fine sandy loam, dark grayish brown (10YR 4/2) moist; common medium distinct yellowish brown (10YR 5/4) moist redox concentrations; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; slightly alkaline (pH 7.6); clear smooth boundary. (0 to 10 inches thick)
IIC3--29 to 54 inches; light brownish gray (10YR 6/2) loamy coarse sand, dark grayish brown (10YR 4/2) moist; common medium distinct yellowish brown (10YR 5/4) moist redox concentrations; single grain; loose; slightly alkaline (pH 7.6); gradual wavy boundary. (0 to 25 inches thick)
IIIC4--54 to 60 inches; light brownish gray (10YR 6/2) extremely gravely loamy coarse sand, dark grayish brown (10YR 4/2) moist; common medium distinct yellowish brown (10YR 5/4) moist redox concentrations; single grain; loose; 70 percent gravel and 10 percent cobbles; slightly alkaline (pH 7.6).
TYPE LOCATION: Teton County, Wyoming; approximately 350 feet north and 125 feet east of the SW corner of the NE1/4 of the NW1/4 of sec. 13, T.41N., R.117W.
RANGE IN CHARACTERISTICS: Depth to the IIC or IIIC horizon is 26 to 40 inches. The mean annual soil temperature is 38 degrees to 40 degrees F. The upper part of the control section has more than 50 percent fine or coarser sand. When mixed, the control section averages less than 35 percent gravel and cobbles, and the matrix averages about fine sandy loam.
The A horizon has hue of 2.5Y or 10YR, value of 4 through 6 dry, 2 through 4 moist, and chroma of 2 or 3. It is fine sandy loam, very fine sandy loam, or loam. Gravel ranges from 0 to 10 percent. This horizon is neutral or slightly alkaline.
The C horizon has hue of 2.5Y or 10YR. It is sandy loam or fine sandy loam with lenses of very fine sandy loam. This horizon is slightly or moderately alkaline.
The IIC horizon, when present, has hue of 2.5Y or 10YR. It is loamy sand or loamy coarse sand.
The IIIC horizon has hue 2.5Y or 10YR. It has 45 to 80 percent gravel and 10 to 25 percent cobbles. The matrix is sand or loamy coarse sand. This horizon is slightly or moderately alkaline.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Wilsonville soils are on nearly level to gently sloping stream bottom lands and terraces. Slopes are 0 to 3 percent. The soils formed in gravelly and cobbly noncalcareous alluvium. Elevation is 6,000 to 7,000 feet. The average annual precipitation is 15 to 21 inches. The mean annual temperature is about 34 degrees to 38 degrees F. The frost-free season is less than 60 to 90 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Newfork soils and the competing Tetonville soils. Newfork soils have an aquic moisture regime.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; moderately rapid permeability. A water table fluctuates to within inches of the surface during the growing season.
USE AND VEGETATION: These soils are used for irrigated cropland, rangeland, homesites and other community uses, recreation, and wildlife habitat. Native vegetation is narrow leaf cottonwood, willows, Kentucky bluegrass, alpine timothy, Nebraska sedge, and baltic rush.
DISTRIBUTION AND EXTENT: In the intermountain valleys of western Wyoming. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Teton County, Wyoming, Grand Teton National Park Area, 1975.