LOCATION WINEVADA CO+NVEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Haplocryolls
TYPICAL PEDON: Winevada fine sandy loam, rangeland. (Colors are for dry soil unless otherwise noted.)
A1--0 to 4 inches; very dark grayish brown (10YR 3/2) fine sandy loam, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; slightly acid (pH 6.4); clear smooth boundary. (4 to 10 inches thick)
A2--4 to 14 inches; very dark grayish brown (10YR 3/2) fine sandy loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; neutral (pH 6.6); abrupt wavy boundary. (8 to 12 inches thick)
A3--14 to 24 inches; dark brown (10YR 4/3) loam, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure parting to moderate fine angular blocky; soft, friable, slightly sticky and slightly plastic; neutral (pH 6.6); abrupt wavy boundary. (8 to 12 inches thick)
Cr--24 to 30 inches; fractured soft sandstone. (0 to 7 inches thick)
R--30 inches; fractured hard sandstone.
TYPE LOCATION: Routt County, Colorado; approximately 8 miles southeast of Hayden, about 400 feet north and 50 feet east of the southwest corner of Sec. 14, T. 5 N., R. 88 W.; Latitude: 40 degrees, 23 minutes, 6 seconds N.; Longitude: 107 degrees, 14 minutes, 14 seconds W.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 39 to 44 degrees F. and the mean summer soil temperature ranges from 56 to 59 degrees F. Depth to the lithic contact is 20 to 40 inches. The Cr horizon is absent in some pedons. The particle-size control section averages 18 to 27 percent clay, 15 to 35 percent silt, and 45 to 60 percent sand. It is commonly a loam, sandy loam, or sandy clay loam. Content of rock fragments ranges from 0 to 30 percent. In some pedons, a thin layer immediately overlying the bedrock contains 15 to 35 percent rock fragments. The mollic epipedon is 16 to 30 inches thick. The soil is noncalcareous throughout.
The A horizons have a value of 3 or 4 dry, 2 or 3 moist, and chroma of 2 or 3. Reaction is neutral or slightly acid.
The C horizon, if present, has value of 5 or 6 dry, 4 or 5 moist, and chroma of 3 or 4.
COMPETING SERIES: These are the Adel (MT),(T) Bullbasin (CO), Bullrey (ID), Duff (NV), Gallatin (MT), Hackwood (NV), (T)Idmon (ID), Karlan (ID), Lamphier (CO), Leavittville (WY), (T) Lespate (CO), Mundos (WY), Osmund (WY), Pavohroo (ID), Rhone (CO), (T) Secondset (CO), Strictland (CO), and (T) Taterheap (CO) soils. The Adel, Bullbasin, Bullrey, Duff, Gallatin, Hackwood, Idmon, Karlan, Lamphier, Leavittville, Mundos, Osmund, Pavohroo, Rhone, and Taterheap soils lack bedrock above 40 inches. Karlan, Leavittville, Lespate, Mundos, and Osmund soils have K horizons. Secondset soils have moisture control sections that are moist for longer cumulative periods when the soil temperature at 20 inches is greater than 41 degrees F. Strictland soils have clay movement and accumulation in an insipient Bt horizon with clay films on the peds.
GEOGRAPHIC SETTING: Winevada soils are on plateaus and mountain slopes. Slopes range from 3 to 70 percent. The soil formed in residuum and colluvium derived from sandstone. Elevation is 6,500 to 8,500 feet. The mean annual precipitation ranges from 18 to 25 inches. Mean annual temperature is 37 to 42 degrees F. Frost-free period is 40 to 75 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Coutis, Foidel, Splitro, and Rhone soils. Coutis, Foidel, and Rhone soils are deep. Splitro soils are shallow to a lithic contact.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation consist of Letterman needlegrass, slender wheatgrass, mountain brome, elk sedge, sagebrush, serviceberry, snowberry, and Gambel oak.
DISTRIBUTION AND EXTENT: These soils occur in northwestern Colorado. The series is of moderate extent. Total area is about 11,000 acres.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: BLM Sonoma Planning Unit, Nevada, 1974.
REMARKS: The diagnostic horizons recognized in this pedon are the mollic epipedon - the zone from 0 to 24 inches, and the lithic contact at 30 inches. The type location and series responsibility was moved from Nevada to Colorado in 1989. Last update by the state 12/90.