LOCATION PIRD                    WA

Established Series
Rev. KDV/KDPL/SBC
09/2019

PIRD SERIES

Landscape--mountains
Landform--mountain slopes
Slope--0 to 60 percent
Parent material--volcanic ash mixed with residuum and colluvium derived from basalt
Mean annual precipitation--about 890 mm
Mean annual air temperature--about 3 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy-skeletal, amorphic Humic Xeric Vitricryands

TYPICAL PEDON: Pird gravelly ashy loam, forested, on a 43-percent, southeast-facing backslope at an elevation of 1425 m (All textures are apparent field textures.)

Oi--0 to 3 cm; slightly decomposed needles and twigs

A1--3 to 15 cm; gravelly ashy loam, brown (7.5YR 4/2) dry, dark reddish brown (5YR 3/2) moist; weak very fine granular structure; soft, friable, slightly sticky and slightly plastic; weakly smeary; many very fine roots; many very fine irregular pores; 20 percent gravel; moderately acid (pH 5.8); clear wavy boundary

A2--15 to 25 cm; gravelly ashy loam, brown (7.5YR 4/2) dry, dark reddish brown (5YR 3/2) moist; weak very fine granular structure; soft, friable, slightly sticky and slightly plastic; weakly smeary; many very fine and few medium roots; many very fine irregular pores; 25 percent gravel; moderately acid (pH 6.0); clear wavy boundary

AB--25 to 64 cm; very gravelly ashy loam, brown (10YR 5/3) dry, dark brown (7.5YR 3/2) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine and fine roots; many very fine irregular pores; 40 percent gravel; moderately acid (pH 5.6); clear wavy boundary

Bw--64 to 107 cm; very gravelly ashy loam, light yellowish brown (10YR 6/4) dry, brown (7.5YR 4/4) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine and fine roots; many very fine irregular pores; 40 percent gravel; slightly acid (pH 6.2); clear wavy boundary

BC--107 to 155 cm; very gravelly ashy loam, light yellowish brown (10YR 6/4) dry, dark yellowish brown (10YR 4/4) moist; weak very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; many very fine irregular pores; 40 percent gravel and 5 percent cobbles; slightly acid (pH 6.2)

TYPE LOCATION: Klickitat County, Washington, about 18 km north of Goldendale; about 760 m south of the northeast corner of section 28, T. 6 N., R. 16 E.; latitude 45.9766249, longitude 120.8013718, datum WGS 84 (coordinates estimated from section, township, and range)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--3 to 6 degrees C
Soil moisture control section--usually moist, but dry 45 to 60 consecutive days following summer solstice
Particle-size control section--7 to 20 percent clay; average of 35 to 60 percent rock fragments

Andic soil properties in particle-size control section
*Moist bulk density--0.65 to 0.90 g/cm3
*Volcanic glass content--5 to 30 percent
*Acid oxalate aluminum plus one-half iron--2 to 3 percent
*Phosphorus retention--50 to 75 percent
*15-bar water retention (air-dried samples)--8 to 12 percent

A horizon
Hue--5YR, 7.5YR
Value--3 to 5 dry, 2 or 3 moist
Chroma--2 to 4 dry or moist
Reaction--5.6 to 6.5
Combined thickness--8 to 25 cm

AB horizon
Thickness--23 to 39 cm

Bw horizon
Hue--5YR to 10YR
Value--4 to 6 dry, 2 to 4 moist
Chroma--2 to 4 dry or moist
Texture of fine-earth fraction--ashy sandy loam, ashy loam
Rock fragment content--35 to 60 percent
Reaction--5.1 to 6.5
Thickness--43 to 71 cm

BC horizon
Hue--5YR to 10YR
Value--4 to 6 dry, 2 to 4 moist
Chroma--2 to 4 dry or moist
Texture of fine-earth fraction--ashy sandy loam, ashy loam
Rock fragment content--35 to 75 percent
Reaction--5.1 to 6.5

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--1150 to 2050 m
Climate--cool, dry summers; cold, wet winters; snow cover in November through May
Mean annual precipitation--760 to 1000 mm
Mean January air temperature--about -7 degrees C
Mean July air temperature--about 13 degrees C
Mean annual air temperature--about 2 to 6 degrees C
Frost-free season--40 to 70 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Grandpon, Satus--on mountains; frigid soil temperature regime
Milling--25 to 50 cm (shallow) to a lithic contact (basalt); on mountains

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
Vegetation--subalpine fir, lodgepole pine, Engelmann spruce, grand fir, elk sedge, huckleberry, strawberry, lupine, Hitchcock's smooth woodrush, northwestern sedge, rabbitbush goldenweed

DISTRIBUTION AND EXTENT: 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 horizon and other features recognized in this pedon
*Umbric epipedon--zone from 3 to 64 cm
*Cambic horizon--zone from 64 to 107 cm
*Andic soil properties--zone from 3 to 155 cm
*Particle-size control section--zone from 3 to 103 cm

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National Cooperative Soil Survey
U.S.A.