LOCATION TAHKEAL WA
Established Series
Rev. RWL/PNP/KDPL/SBC
09/2019
TAHKEAL SERIES
Landscape--mountains
Landform--mountain slopes, terraces, benches
Slope--2 to 35 percent
Parent material--volcanic ash over block-and-ash flow or mudflow deposits
Mean annual precipitation--890 mm
Mean annual air temperature--about 6 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--frigid
Soil moisture subclass--typic
TAXONOMIC CLASS: Ashy, amorphic, frigid Typic Vitrixerands
TYPICAL PEDON: Tahkeal ashy sandy loam in an area of forestland, on a 2-percent slope at an elevation of 850 m (All textures are apparent field textures.)
Oi--0 to 8 cm; forest litter of slightly decomposed needles, leaves, and twigs
A--8 to 25 cm; ashy sandy loam, dark yellowish brown (10YR 4/4) dry, dark brown (10YR 3/3) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, and medium roots; common very fine irregular pores; 5 percent gravel; slightly acid (pH 6.5), NaF pH 10.7; clear smooth boundary
Bw1--25 to 74 cm; ashy sandy loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; common fine, medium, and coarse and few very fine roots; common very fine and fine irregular pores; 5 percent gravel; slightly acid (pH 6.5), NaF pH 11.0; clear smooth boundary
2Bw2--74 to 102 cm; very cobbly ashy sandy loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; many medium and coarse roots; common fine and medium irregular pores; 10 percent gravel and 25 percent cobbles; neutral (pH 7.0), NaF pH 11.0; gradual smooth boundary
2BC--102 to 165 cm; very stony ashy sandy loam, yellowish brown (10YR 5/6) dry, dark yellowish brown (10YR 3/6) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and nonplastic; few medium and coarse roots; few fine irregular pores; 5 percent gravel, 30 percent cobbles, and 15 percent stones; neutral (pH 7.0), NaF pH 11.0
TYPE LOCATION: Yakama Nation, Yakima County, Washington, about 3 km southwest of Castile Falls, along the Klickitat River; about 670 m east and 105 m north of the southwest corner of section 25, T. 9 N., R. 12 E.; latitude 46.2306531, longitude -121.2613639, datum WGS 84
RANGE IN CHARACTERISTICS:
Mean annual soil temperature at a depth of 50 cm--7 to 8 degrees C
Moisture control section--usually moist, but dry 45 to 60 consecutive days following summer solstice
Depth to ashy-skeletal mudflow deposits (2Bw horizon)--65 to 100 cm
Particle-size control section
*Moist bulk density--0.65 to 0.90 g/cm3
*Volcanic glass content--5 to 30 percent
*Ammonium oxalate aluminum plus one-half iron--more than 2 percent
*15-bar water retention--less than 12 percent (air-dried samples)
*Rock fragment content--0 to 25 percent in upper part, 35 to 80 percent in lower part
Oi horizon
Thickness--3 to 8 cm
A horizon
Value--4 or 5 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Reaction--5.6 to 6.5
Thickness--8 to 25 cm
Bw horizon
Hue--7.5YR, 10YR
Value--4 to 6 dry, 3 or 4 moist
Chroma--4 to 6 dry or moist
Texture--ashy sandy loam, gravelly ashy sandy loam
Rock fragment content--0 to 25 percent
Reaction--5.6 to 6.5
Thickness--41 to 76 cm
2Bw and 2BC horizons
Hue--7.5YR, 10YR
Value--4 to 6 dry, 3 or 4 moist
Chroma--2 to 6 dry or moist
Texture--very cobbly sandy loam, very stony sandy loam, very gravelly sandy loam, extremely gravelly sandy loam, extremely cobbly sandy loam
Rock fragment content--35 to 80 percent
Reaction--6.1 to 7.3
Thickness of 2Bw horizon--20 to 36 cm
COMPETING SERIES:
Bigwall--dry 60 to 90 days following summer solstice; 60 to 90 percent volcanic glass
GEOGRAPHIC SETTING:
Elevation--790 to 1225 m
Mean annual precipitation--760 to 1000 mm
Mean annual air temperature--6 to 7 degrees C
Frost-free period--70 to 100 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Singh--on benches and side slopes; loamy-skeletal; argillic horizon
Yatama--on mountain benches and side slopes; umbric epipedon
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high
USE AND VEGETATION:
Use--mainly timber production, livestock grazing, wildlife habitat, recreation, watershed
Vegetation--ponderosa pine, grand fir, Douglas-fir, elk sedge, trailing snowberry, common prince's pine, pinegrass, sidebells pyrola
DISTRIBUTION AND EXTENT: Eastern slopes of Cascade Mountains in south-central Washington; MLRA 3; 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
*Cambic horizon--zone from 25 to 102 cm
*Andic soil properties--zone from 8 to 165 cm
*Particle-size control section--zone from 8 to 108 cm
Tahkeal is the name of an original signer of the Yakama Treaty. It is a surname used by the Yakama Nation. The spelling is not consistent with the Yakama orthography; however, it is allowed as a show of respect to the Tahkeal family.
National Cooperative Soil Survey
U.S.A.