LOCATION WEIRMAN                 WA+OR

Established Series
Rev. JJR/KAH/MPR
09/2019

WEIRMAN SERIES

Landscape--valleys
Landform--flood plains, low terraces
Slope--0 to 5 percent
Parent material--alluvium
Mean annual precipitation--about 250 mm
Mean annual air temperature--about 11 degrees C
Depth class--very deep
Drainage class--somewhat excessively drained
Soil moisture regime--aridic (bordering on xeric)
Soil temperature regime--mesic
Soil moisture subclass--xeric

TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Torrifluventic Haploxerolls

TYPICAL PEDON: Weirman fine sandy loam in an area of irrigated cropland

Ap1--0 to 8 cm; fine sandy loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many fine roots; neutral (pH 7.0); abrupt smooth boundary

Ap2--8 to 23 cm; fine sandy loam, grayish brown (10YR 5/2) dry, very dark grayish brown (10YR 3/2) moist; massive; soft, very friable, nonsticky and nonplastic; many fine roots; common fine tubular pores; neutral (pH 7.0); abrupt smooth boundary

AC--23 to 49 cm; loamy fine sand, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; single grain; loose, nonsticky and nonplastic; many fine roots; neutral (pH 7.0); gradual wavy boundary

2C1--49 to 109 cm; extremely gravelly loamy sand, grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; few fine roots; 75 percent gravel; neutral (pH 6.8); gradual wavy boundary

2C2--109 to 150 cm; extremely gravelly loamy sand, grayish brown (10YR 5/2) dry, dark grayish brown (10YR 4/2) moist; single grain; loose; few fine roots; 75 percent gravel; common prominent redoximorphic concentrations, yellowish red (5YR 4/6) moist; neutral (pH 6.8)

TYPE LOCATION: Yakima County, Washington, about 45 m southeast of the intersection of Brooks and Weirman Roads; in the NE1/4NE1/4 of section 30, T. 11 N., R. 20 E., Willamette Meridian; latitude 46.4169273, longitude -120.3581467, datum WGS 84 (coordinates estimated from section, township, and range)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--9 to 12 degrees C
Soil moisture--usually dry, but may be saturated with water at a depth of 100 to 180 cm; high water table result of natural conditions and irrigation
Depth to bedrock--more than 150 cm
Rock fragment content in particle-size control section--averages 35 to 60 percent
Thickness of mollic epipedon--25 to 50 cm
Organic carbon content--less than 0.6 percent below AC horizon
Reaction--6.6 to 7.8

A or Ap horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Texture of fine-earth fraction--loam, silt loam, sandy loam, fine sandy loam
Rock fragment content--0 to 50 percent
Clay content--0 to 10 percent
Combined thickness of A horizons--8 to 35 cm

AC horizon, and C horizon (where present)
Value--4 to 6 dry, 3 or 4 moist
Chroma--2 or 3 dry or moist
Texture of fine-earth fraction--dominantly sand, loamy sand, or loamy fine sand; thin strata of fine sandy loam or sandy loam in some pedons
Rock fragment content--0 to 50 percent
Clay content--2 to 5 percent
Thickness of AC horizon--15 to 50 cm

2C horizon
Value--4 or 5 dry, 3 or 4 moist
Chroma--2 or 3 moist or dry
Texture of fine-earth fraction--sand, loamy sand
Rock fragment content--35 to 80 percent
Clay content--0 to 2 percent
Combined thickness--greater than 54 cm

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--75 to 790 m
Climate--hot, dry summers; cool, moist winters
Mean annual precipitation--150 to 360 mm
Mean January air temperature--about -2 degrees C
Mean July air temperature--about 23 degrees C
Mean annual air temperature--about 9 to 12 degrees C
Frost-free season--110 to 195 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Ashue, Naches--on terraces; argillic horizon
Yakima--on bottomland; nonskeletal

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat excessively drained
Saturated hydraulic conductivity (Ksat)--high
Irrigation-induced water table (when present)--uppermost limit at a depth of 100 to 150 cm at some time in April through November
Apparent water table (when present)--at a depth of 100 to 180 cm at some time in November through April
Flooding--frequent, brief or long periods unless protected

USE AND VEGETATION:
Use--dominantly irrigated crop, hay, and pasture production
Native vegetation--bluebunch wheatgrass, basin wildrye, big bluegrass, big sagebrush, scattered willow and black cottonwood along stream channels

DISTRIBUTION AND EXTENT: South-central and southeastern Washington and east-central Oregon; MLRAs 7, 8, and 10; moderate extent

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Yakima County, Washington; 1970

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Mollic epipedon--zone from the surface to a depth of 49 cm; assumed irregular decrease in organic carbon as depth increases
*Particle-size control section--zone from 25 to 100 cm

---

National Cooperative Soil Survey
U.S.A.