LOCATION STARBUCK                WA+ID+OR

Established Series
Rev. CDL/KWH/RWL
09/2019

STARBUCK SERIES

Landscape--plateaus, hills
Landform--benches, hillslopes, terraces, ridgetops
Slope--0 to 65 percent
Parent material--loess, colluvium, residuum
Mean annual precipitation--about 230 mm
Mean annual air temperature--about 10 degrees C
Depth class--shallow
Drainage class--well drained
Soil moisture regime-aridic (bordering xeric)
Soil temperature regime--mesic
Soil moisture subclass--xeric

TAXONOMIC CLASS: Loamy, mixed, superactive, mesic Lithic Xeric Haplocambids

TYPICAL PEDON: Starbuck silt loam in an area of grassland (All textures are apparent field textures.)

A1--0 to 8 cm; silt loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium platy structure and weak medium granular; slightly hard, friable, slightly sticky and slightly plastic; many roots; many fine and very fine tubular pores; 5 percent angular basalt gravel; neutral (pH 6.6); abrupt smooth boundary

A2--8 to 23 cm; silt loam, brown (10YR 5/3) dry, dark brown (10YR 3/3) moist; weak medium granular structure; slightly hard, friable, slightly sticky and slightly plastic; common roots; many fine tubular pores; 5 percent angular basalt gravel; neutral (pH 6.8); clear smooth boundary

Bw--23 to 41 cm; silt loam, pale brown (10YR 6/3) dry, brown (10YR 4/3) moist; weak medium prismatic structure; slightly hard, friable, slightly sticky and slightly plastic; common roots; many fine tubular pores; 10 percent basalt gravel; neutral (pH 7.0); abrupt wavy boundary

2R--41 cm; unweathered basalt

TYPE LOCATION: Adams County, Washington, about 320 m south and 400 m west of the northeast corner of section 4, T. 17 N., R. 34 E.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--10 to 13 degrees C
Soil moisture--usually dry in all parts between a depth of 20 cm and the surface of the bedrock
Depth to bedrock--25 to 50 cm
Particle-size control section--5 to 15 percent clay; averages 5 to 35 percent gravel, cobbles, and stones
Reaction of solum--6.6 to 7.8

A horizon
Value--5 or 6 dry, 2 to 4 moist
Chroma--2 to 4 dry or moist
Textural modifier--stony in some pedons
Organic matter content--0.5 to 1.0 percent
Combined thickness--8 to 30 cm

Bw horizon
Value--5 or 6 dry, 3 to 5 moist
Chroma--2 to 4 dry or moist
Texture--very fine sandy loam, silt loam, fine sandy loam, loam, gravelly silt loam
Thickness--15 to 33 cm

COMPETING SERIES:
Calzacorta--18 to 35 percent clay in particle-size control section
Slayton--fine-earth texture of sandy loam; 15 to 35 percent tuff or breccia channers in particle-size control section
Trevino--20 to 46 cm deep to calcium carbonate (Bkq horizon)

GEOGRAPHIC SETTING:
Elevation--75 to 825 m in Washington and Oregon, 1075 to 1425 m in Idaho
Climate--semiarid; hot, dry summers; cool, moist winters
Mean annual precipitation--150 to 310 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 period--120 to 210 days in Washington and Oregon, 130 to 140 days in Idaho

GEOGRAPHICALLY ASSOCIATED SOILS:
Farrell, Magallon, Stratford--on terraces; no lithic contact within a depth of more than 150 cm
Mikkalo--on uplands; 50 to 100 cm (moderately deep) to a lithic contact (basalt)
Prosser, Ritzville, Roloff--on hills; 50 to 100 cm (moderately deep) to a lithic contact (basalt)
Ritzville--on hills; no lithic contact within a depth of 100 cm or more

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high

USE AND VEGETATION:
Use--domestic livestock grazing
Native vegetation--bluebunch wheatgrass, Sandberg bluegrass, Thurber needleandthread, rabbitbrush, sagebrush

DISTRIBUTION AND EXTENT: Central Washington, north-central Oregon, and southern Idaho; MLRA 8; moderate extent

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

SERIES ESTABLISHED: Walla Walla County, Washington; 1960

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 23 to 41 cm
*Depth to lithic contact--41 cm
*Particle-size control section--zone from 25 to 41 cm

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National Cooperative Soil Survey
U.S.A.