LOCATION TRELK WA
Established Series
Rev. KDV/TA/RJE/RWL
09/2019
TRELK SERIES
Landscape--mountain valleys
Landform--terraces
Slope--2 to 30 percent
Parent material--alluvium and residuum derived from basalt with a thin mantle of volcanic ash
Mean annual precipitation--about 810 mm
Mean annual air temperature--about 8 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--typic
TAXONOMIC CLASS: Fine-loamy, isotic, mesic Andic Haploxeralfs
TYPICAL PEDON: Trelk ashy loam, forested, on a 2-percent slope at an elevation of 540 m (All textures are apparent field textures.)
Oi--0 to 1 cm; slightly decomposed needles and twigs
Oa--1 to 3 cm; highly decomposed organic material
A1--3 to 15 cm; ashy loam, brown (7.5YR 5/4) dry, dark brown (7.5YR 3/4) moist; weak fine granular structure; soft, very friable, slightly sticky and slightly plastic; weakly smeary; many very fine and fine and common medium roots; many fine irregular pores; neutral (pH 6.8); gradual smooth boundary
A2--15 to 28 cm; ashy loam, brown (7.5YR 5/4) dry, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; weakly smeary; common very fine and fine and few medium roots; common fine irregular and tubular pores; 5 percent gravel; neutral (pH 6.8); clear smooth boundary
2BA--28 to 46 cm; loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; common fine irregular pores and few fine tubular pores; 5 percent gravel; neutral (pH 6.8); gradual wavy boundary
2Bt--46 to 86 cm; loam, brown (7.5YR 5/4) dry, brown (7.5YR 4/4) moist; moderate fine and medium subangular blocky structure; hard, firm, moderately sticky and slightly plastic; few fine and medium and common very fine roots; common fine irregular and tubular pores; common faint clay films on faces of peds and in pores; 10 percent gravel and 5 percent paragravel; neutral (pH 6.8); gradual smooth boundary
2C--86 to 155 cm; gravelly loam, brown (7.5YR 5/4) dry, brown (7.5YR 4/4) moist; massive; slightly hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; common fine irregular pores and few fine tubular pores; 15 percent gravel and 10 percent paragravel; slightly acid (pH 6.4)
TYPE LOCATION: Klickitat County, Washington, about 10 km east of Glenwood; about 15 m north and 780 m east of the southwest corner of section 10, T. 6 N., R. 13 E.; latitude 46 degrees, 0 minutes, 57 seconds north and longitude 121 degrees, 10 minutes, 3 seconds west
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 9 degrees C
Soil moisture control section--dry in all parts 60 to 75 consecutive days within the 4 months following summer solstice in 6 years or more out of 10 years
Particle-size control section--18 to 33 percent clay; 0 to 20 percent gravel; 0 to 10 percent paragravel
Reaction--5.6 to 7.3 throughout
Volcanic ash influence
*Thickness--18 to 35 cm
*Moist bulk density--0.80 to 0.90 g/cm3
*Volcanic glass content--30 to 60 percent
*Acid oxalate aluminum plus one-half iron--1 to 2 percent
*Phosphorus retention--50 to 75 percent
*15-bar water retention--8 to 12 percent
A horizon
Hue--5YR, 7.5YR
Chroma--3 or 4 dry or moist
Texture--ashy loam, gravelly ashy loam
Combined thickness--18 to 46 cm
2BA horizon
Thickness--18 to 28 cm
2Bt horizon
Value--3 or 4 moist, 5 or 6 dry
Chroma--4 to 6 dry or moist
Texture--loam, clay loam, gravelly loam
Thickness--30 to 43 cm
2C horizon
Chroma--4 to 6 dry
Texture--loam, gravelly loam
COMPETING SERIES: None
GEOGRAPHIC SETTING:
Elevation--400 to 980 m
Climate--warm, dry summers; cool, moist winters; snow cover in December through April
Mean annual precipitation--760 to 890 mm
Mean January air temperature--about -4 degrees C
Mean July air temperature--about 17 degrees C
Mean annual air temperature--7 to 8 degrees C
Frost-free season--90 to 120 days
GEOGRAPHICALLY ASSOCIATED SOILS:
McCumber--on foot slopes; ashy-skeletal particle-size class
Pinbit--on terraces; ashy particle-size class
Yedlick--on mountains; loamy-skeletal particle-size class
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high
USE AND VEGETATION:
Use--timber production, livestock grazing, wildlife habitat
Native vegetation--ponderosa pine, Douglas-fir, Oregon white oak, pinegrass, common snowberry, snowbrush ceanothus, squawcarpet, kinnikinnick, creambush oceanspray, rose
DISTRIBUTION AND EXTENT: East slopes of Cascade Mountains, western Klickitat and Yakima Counties, Washington; MLRA 6; moderate extent
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Klickitat County, Washington; 2003
REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Argillic horizon--zone from 46 to 86 cm
*Andic feature--zone from 3 to 28 cm
*Particle-size control section--zone from 46 to 86 cm
National Cooperative Soil Survey
U.S.A.