LOCATION SLAKISH WA
Established Series
Rev. JMB/KAH/SBC
09/2019
SLAKISH SERIES
Landscape--plateaus, mountains, canyonlands
Landform--benches, mountain slopes, canyons
Slope--5 to 90 percent
Parent material--volcanic ash over block-and-ash flow deposits
Mean annual precipitation--about 1000 mm
Mean annual air temperature--about 6 degrees C
Depth class--deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, mixed, frigid Typic Vitrixerands
TYPICAL PEDON: Slakish ashy sandy loam in an area of forestland, on a 35-percent, northeast-facing slope at an elevation of 1300 m (All textures are apparent field textures.)
Oi--0 to 8 cm; slightly decomposed needles and litter
A--8 to 64 cm; ashy sandy loam, dark yellowish brown (10YR 4/4) dry, dark yellowish brown (10YR 3/4) moist; weak very fine and fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine and common medium roots; common fine irregular pores; 5 percent gravel; slightly acid (pH 6.5), NaF pH 11.5; clear wavy boundary
2Bw1--64 to 97 cm; very gravelly ashy fine sandy loam, dark yellowish brown (10YR 4/4) dry, dark yellowish brown (10YR 3/4) moist; weak very fine and fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; many very fine and fine, common medium, and few coarse roots; common very fine irregular pores; 30 percent gravel and 5 percent cobbles; slightly acid (pH 6.5), NaF pH 11.5; gradual wavy boundary
2Bw2--97 to 122 cm; very gravelly ashy sandy loam, dark yellowish brown (10YR 4/6) dry, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and few fine and medium roots; few fine irregular pores; 40 percent gravel and 10 percent cobbles; neutral (pH 7.0), NaF pH 11.0; gradual wavy boundary
2BC--122 to 147 cm; extremely gravelly ashy sandy loam, dark yellowish brown (10YR 4/4) dry, dark yellowish brown (10YR 3/4) moist; weak very fine and fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine and few medium roots; few very fine irregular pores; 50 percent gravel, 10 percent cobbles, and 5 percent stones; neutral (pH 7.0), NaF pH 11.0; clear wavy boundary
2Cr--147 cm; highly weathered basalt
TYPE LOCATION: Yakama Nation, Yakima County, Washington, about 4 km west of the Cougar Creek Guard Station; about 410 m south and 610 m west of the northeast corner of section 31, T. 8 N., R. 12 E.; latitude 46.1429024, longitude -121.3511352, datum WGS 84 (coordinates estimated from section, township, and range)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature at a depth of 50 cm--7 to 8 degrees C
Soil moisture control section--usually moist, but dry in all parts 45 to 60 consecutive days following summer solstice
Rock fragment content in particle-size control section--0 to 15 percent in upper part, 35 to 65 percent in lower part, weighted average of 20 to 35 percent
Depth to paralithic contact (highly weathered basalt)--100 to 150 cm
Andic soil properties in particle-size control section
*Moist bulk density--0.75 to 0.85 g/cm3
*Volcanic glass content--5 to 30 percent
*Acid oxalate aluminum plus one-half iron--2 to 3 percent
*15-bar water retention (air-dried samples)--8 to 12 percent
Oi horizon
Thickness--0 to 8 cm
A horizon
Hue--7.5YR, 10YR
Value--3 or 4 dry, 2 or 3 moist
Chroma--3 or 4 dry or moist
Rock fragment content--0 to 10 percent
Thickness--10 to 64 cm
2Bw horizon
Value--3 to 6 dry
Chroma--4 to 6 dry
Texture of fine-earth fraction--ashy fine sandy loam, ashy sandy loam
Rock fragment content--25 to 65 percent
Structure--subangular blocky
Combined thickness--51 to 81 cm
2BC horizon
Value--4 or 5 dry, 2 or 3 moist
Chroma--1 to 6 dry or moist
Rock fragment content--50 to 75 percent
Thickness--20 to 36 cm
COMPETING SERIES:
Dekkas--no paralithic contact within a depth of 150 cm (very deep); loamy sand or loamy coarse sand in particle-size control section; dry 60 to 90 days
GEOGRAPHIC SETTING:
Elevation--975 to 1300 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--890 to 1300 mm
Mean annual air temperature--6 to 7 degrees C
Frost-free season--70 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Patuwatam--on undulating plateaus and side slopes; cryic soil temperature regime
Icksix--on side slopes and toeslopes; ashy-skeletal particle-size class
Yatama--on benches and side slopes; umbric epipedon
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--high
USE AND VEGETATION:
Use--timber production, livestock grazing, wildlife habitat, recreation, watershed
Native vegetation--grand fir, Douglas-fir, ponderosa pine, sidebells pyrola, queencup beadlily, California hazel, northern twinflower
DISTRIBUTION AND EXTENT: Eastern slopes of Cascade Mountains in south-central Washington; MLRA 6; small extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakama Nation; Yakima County, Washington; 2014
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Andic soil properties--zone from 8 to 147 cm
*Cambic horizon--zone from 64 to 122 cm
*Particle-size control section--zone from 8 to 108 cm
Slakish is the name of one of the original signers of the Yakama Treaty. Slakish, or a variation of this spelling, is a present-day surname of the Yakama Nation.
National Cooperative Soil Survey
U.S.A.