LOCATION PATIT CREEK WA+OR
Established Series
Rev. RFM/RJE/CSW
06/2016
PATIT CREEK SERIES
Landscape--Columbia basalt plateau
Landform--bottomlands
Slope--0 to 5 percent
Parent material--recent alluvium derived from loess mixed with basaltic material
Mean annual precipitation--about 510 mm
Mean annual air temperature--about 10 degrees C
Depth class--deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Patit Creek silt loam, cultivated
Ap--0 to 15 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; moderate fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; some earthworm channels and casts; neutral (pH 6.8); abrupt smooth boundary
A2--15 to 30 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; moderate medium and fine granular structure; slightly hard, friable, sticky and plastic; many fine and very fine roots; few fine tubular pores; some earthworm channels and casts; about 5 percent gravel; neutral (pH 6.8); clear wavy boundary
A3--30 to 61 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; weak medium prismatic structure; hard, friable, sticky and plastic; many fine and very fine roots; few fine tubular pores; some earthworm channels and casts; few faint fine mottles; very few thin patchy clay films on peds; about 5 percent gravel; neutral (pH 6.8); clear wavy boundary
A4--61 to 91 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark brown (10YR 2/2) moist; massive; slightly hard, friable, sticky and plastic; few very fine roots; few fine tubular pores; some earthworm channels and casts; about 5 percent gravel; neutral (pH 6.8); clear wavy boundary
2C--91 to 168 cm; extremely gravelly sandy loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; massive; soft, friable, nonsticky and nonplastic; few very fine roots; few faint fine mottles; about 65 percent gravel and 5 percent cobbles; neutral (pH 6.8)
TYPE LOCATION: Columbia County, Washington, about 400 m west of Dumas; in the SE1/4NW1/4 of section 4, T. 9 N., R. 38 E; Huntsville, Washington, U.S. Geological Survey 7.5-minute topographic quadrangle; latitude 46.2877870, longitude -118.0665030, datum WGS 84 (coordinates estimated from PLSS details)
RANGE IN CHARACTERISTICS:
Depth to 2C horizon--50 to 100 cm
Mean annual soil temperature--10 to 11 degrees C
Reaction--6.6 to 7.8 throughout
Moisture control section--dry 60 to 75 consecutive days following summer solstice
Above 2C horizon
*Content of clay--5 to 15 percent
*Content of fragments coarser than very fine sand--15 to 50 percent
A horizon
*Value--4 or 5 dry, 2 or 3 moist
*Texture--loam, silt loam, gravelly loam, cobbly loam
*Combined thickness--50 to 100 cm
2C horizon
*Value--3 or 4 moist, 4 to 6 dry
*Chroma--2 to 4
*Texture--very gravelly, very cobbly, extremely gravelly
COMPETING SERIES:
Coxlake--mottles (assumed to be redoximorphic features as iron masses) at a depth of 74 to 150 cm
Deerspring--mottles (assumed to be redoximorphic features as iron masses) at a depth of 142 to 165 cm
Endersby--sandy textures below particle-size control section
Evans--dry 80 to 100 days; less than 5 percent gravel in lower part of particle-size control section
Lapwai--secondary carbonates in and below particle-size control section
Leavenworth--no rock fragments in particle-size control section
Narcisse--less than 20 percent rock fragments throughout; redoximorphic concentrations in lower part of particle-size control section
Okanogan--less than 10 percent rock fragments in particle-size control section
Pleasant View--secondary carbonates in and below particle-size control section
Plinco--redoximorphic features as iron masses at a depth of 147 to 163 cm
Porter--aridic moisture regime bordering on xeric
Poween--dry 75 to 90 consecutive days; less than 15 percent gravel throughout
Redola--slightly calcareous to strongly calcareous throughout
Threecreeks--slightly acid or moderately acid throughout
Tombeall--mottles (assumed to be redoximorphic features as iron masses) at a depth of 43 cm
GEOGRAPHIC SETTING:
Elevation--360 to 850 m
Climate--warm, dry summers; cold, wet winters
Mean annual precipitation--450 to 610 mm
Mean January air temperature--about -1 degree C
Mean July air temperature--about 22 degrees C
Frost-free season--120 to 140 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Athena,
Mondovi,
Palouse--no contrasting substratum within a depth of 100 cm
Gwin,
Kuhl--25 to 50 cm deep to bedrock
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high or high above 2C horizon, high or very high in 2C horizon
USE AND VEGETATION:
Use--crop production, livestock grazing
Crops--asparagus, corn for silage, grasses, legumes, orchard crops (most areas irrigated)
Native vegetation--bluebunch wheatgrass, Sandberg bluegrass, basin wildrye, black hawthorn, rose, and scattered Douglas-fir, ponderosa pine, black cottonwood, and alder
DISTRIBUTION AND EXTENT: Eastern Washington, eastern Oregon, and possibly northern Idaho; MLRA 9; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Columbia County, Washington; 1938
REMARKS:
Diagnostic horizons and features recognized in this pedon
*Mollic epipedon--zone from surface to a depth of 91 cm
*Organic carbon--irregular decrease with increasing depth (assumed)
*Lithologic discontinuity--extremely gravelly sandy loam at a depth of 91 cm
05/2016--The Patit Creek official series was used in an update project of some riparian areas southeast of Pendleton in Umatilla County, Oregon. Wide ranges in climate were populated in NASIS due to the nature of the lotic riparian areas along several km of a stream.
6/2016--This official series description was updated according to SSR1 Technical Note 11--Content and Format of Official Series Descriptions (revised 12/2015).
National Cooperative Soil Survey
U.S.A.