LOCATION NEVO WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Lithic Xeric Haplargids
TYPICAL PEDON: Nevo very cobbly loam- rangeland, on a 4 percent southwest-facing slope at 1,200 feet elevation. (Colors are for dry soil unless otherwise stated. All textures are apparent field textures.)
A--0 to 2 inches; brown (10YR 5/3) very cobbly loam, very dark grayish brown (10YR 3/2) moist; weak medium and coarse platy structure parting to weak medium granular; soft, very friable, nonsticky and nonplastic; many very fine roots; few very fine tubular pores; 20 percent gravel and 25 percent cobbles; neutral (pH 7.0); clear smooth boundary. (2 to 4 inches thick).
Bt--2 to 8 inches; brown (7.5YR 4/2) very gravelly clay loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure parting to moderate fine granular; slightly hard, friable, sticky and plastic; common very fine roots; many very fine tubular pores; common distinct clay films on the faces of peds; 25 percent gravel and 25 percent cobbles; neutral, (pH 7.0); clear smooth boundary. (4 to 6 inches thick).
R--8 inches; fractured basalt bedrock with silica coatings over 30 percent of total surface area.
TYPE LOCATION: Kittitas County, Washington, 500 feet south and 2,000 feet east of the northwest corner of section 1, T. 14 N., R. 22 E.; USGS Black Rock Spring NE topographic quadrangle; Latitude 46 degrees, 45 minutes, 44 seconds N., Longitude 120 degrees. 0 minutes, 44 seconds W.
RANGE IN CHARACTERISTICS: Average annual soil temperature at the lithic contact ranges from 50 to 56 degrees F. These soils are dry in all parts above the lithic contact more than half of the time that the soil temperature is above 40 degrees F. The particle-size control section averages 25 to 33 percent clay in the fine earth fraction and 40 to 75 percent basalt fragments by volume. Solum thickness and depth to a lithic contact ranges from 5 to 10 inches. Reaction is neutral or slightly alkaline.
The A horizon has value of 4 or 5 dry, 2 or 3 moist and chroma of 2 or 3 moist. Texture is very cobbly loam or extremely gravelly sandy loam.
The Bt horizon has value of 4 or 5 dry and chroma of 3 or 4 dry or moist. Texture is very gravelly loam, very cobbly loam, very gravelly clay loam or extremely gravelly loam.
COMPETING SERIES: These are the Altow, Boomstick, Checkett, Cottle, Fortyday, Gabbvally, Hooplite, Olac, Old camp, Phliss, Rowel, Sedsked (T), Soughe, Stewval, and Thike series. Atlow soils are 14 to 20 inches deep and are moderately to strongly alkaline in the argillic horizon. Boomstick soils are 14 to 20 inches deep and are dominantly channers and flagstones in the profile. Checkett soils are moderately or strongly alkaline throughout and are 14 to 19 inches deep. Cottle soils have secondary carbonates in the lower argillic horizon. Fortyday soils are 14 to 20 inches to bedrock and are 18 to 25 percent clay in the argillic horizon. Gabbvally soils are 15 to 25 percent clay in the control section. Hooplite soils are 18 to 25 percent clay in the particle-size control section and have slight or strong effervescence in the argillic horizon. Olac and Soughe soils lack silica coatings on fracture planes. Old camp soils have carbonates on coarse fragments in the lower part of the argillic horizon. Phliss soils are moderately alkaline throughout and effervescence increases with depth. Rowel soils have an abrupt textural change and an argillic horizon with 40 to 55 percent clay. Sedsked soils are 10 to 20 inches deep to lithic contact (metasedimentary bedrock) and have a pscs dominated by sedimentary rock fragments. Stewval soils are calcareous throughout. Thike soils have less than 18 percent clay in the argillic horizon.
GEOGRAPHIC SETTING: Nevo soils are on ridgetops and benches and have slopes of 3 to 60 percent. These soils formed in loess and residuum weathered from basalt. Elevations are 500 to 2,000 feet. These soils are in an arid climate with hot dry summers and cool moist winters. The mean annual precipitation 6 to 9 inches. The average January temperature is about 29 degrees F. and the average July temperature is about 71 degrees F. The mean annual temperature is 48 to 50 degrees F. Frost-free season is 135 to 195 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Drino, Fortyday, and Prosser soils. Drino soils are on hillslopes and are 20 to 40 inches to bedrock. Fortyday soils are on ridges, are 14 to 20 inches to bedrock and have less than 25 percent clay in the argillic horizon. Prosser soils are on hillslopes and are moderately deep.
DRAINAGE AND PERMEABILITY: Well drained, medium to very rapid runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. Native vegetation is mainly Sandberg bluegrass, narrowleaf goldenweed, thyme eriogonum, and stiff sagebrush.
DISTRIBUTION AND EXTENT: Kittitas County, Washington; MLRA 7. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Kittitas County, Washington, Yakima Training Center, 1994.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
ochric epipedon the zone from the surface to 2 inches
argillic horizon the zone from 2 to 8 inches
lithic contact the zone beginning at 8 inches.
particle-size control section the zone from 2 to 8 inches (Bt horizon).
12/1999. This soil is reclassified based on amendment 17 of Soil Taxonomy