LOCATION WALUPT                  WA

Established Series
Rev. CSM/AFW/TDT
09/2019

WALUPT SERIES

Landscape--plateaus, mountains
Landform--mountain slopes, structural benches
Slope--5 to 55 percent
Parent material--volcanic ash over colluvium derived from basalt or andesite
Mean annual precipitation--about 1800 mm
Mean annual air temperature--about 4 degrees C
Depth class--very deep
Drainage class--well drained
Soil moisture regime--udic
Soil temperature regime--cryic
Soil moisture subclass--typic

TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic Ultic Vitricryands

TYPICAL PEDON: Walupt ashy loamy sand in an area of forestland, on a 15-percent, northeast-facing slope at an elevation of 1150 m (All textures are apparent field textures.)

Oi--0 to 5 cm; slightly decomposed forest litter mixed with a small amount of 1980 Mount St. Helens volcanic ash

E--5 to 8 cm; ashy sand, light gray (10YR 7/1) dry, gray (10YR 5/1) moist; single grain; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; NaF pH 11.5; slightly acid (pH 6.2); abrupt smooth boundary

A--8 to 18 cm; ashy loamy sand, brown (10YR 5/3) dry, brown (10YR 4/3) moist; weak fine subangular blocky structure parting to weak fine and medium granular; soft, very friable, nonsticky and nonplastic; many very fine and fine and few medium and coarse roots; many very fine and fine irregular pores; 5 percent gravel; NaF pH 11.5; slightly acid (pH 6.2); clear smooth boundary

Bw1--18 to 41 cm; ashy sandy loam, brown (10YR 5/3) dry, brown (10YR 4/3) moist; weak fine subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; common fine, medium, and coarse roots; many very fine and fine irregular pores; 10 percent gravel; NaF pH 11.5; slightly acid (pH 6.2); clear smooth boundary

Bw2--41 to 53 cm; gravelly ashy fine sandy loam, yellowish brown (10YR 5/4) dry, brown (7.5YR 4/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine and few medium roots; many very fine and fine irregular pores; 15 percent gravel; NaF pH 11.5; slightly acid (pH 6.2); clear irregular boundary

2Bt1--53 to 91 cm; very cobbly loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 4/4) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine, fine, medium, and coarse roots; common very fine and fine irregular pores and few fine tubular pores; few distinct brown (10YR 4/3) clay films lining pores and on faces of peds; 25 percent gravel and 25 percent cobbles; slightly acid (pH 6.3); clear irregular boundary

2Bt2--91 to 132 cm; very gravelly loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 4/4) moist; moderate fine and medium subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine, fine, medium, and coarse roots; common very fine and fine irregular pores and few fine tubular pores; common distinct brown (10YR 4/3) clay films lining pores and on faces of peds; 25 percent gravel and 15 percent cobbles; neutral (pH 6.6); gradual wavy boundary

2Bt3--132 to 157 cm; very gravelly loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 4/4) moist; moderate medium and coarse subangular blocky structure; slightly hard, very friable, slightly sticky and slightly plastic; few very fine, fine, medium, and coarse roots; common very fine and fine irregular pores and few fine tubular pores; few distinct brown (10YR 4/3) clay films lining pores and on faces of peds; 30 percent gravel and 20 percent cobbles; slightly acid (pH 6.4)

TYPE LOCATION: Yakima County, Washington, about 13 km northwest of Cliffdell; about 460 m south and 430 m west of the northeast corner of section 1, T. 18 N., R. 12 E.; latitude 47 degrees, 4 minutes, 30 seconds north and longitude 121 degrees, 17 minutes, 33 seconds west

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4 to 7 degrees C
Mean summer soil temperature--6 to 7 degrees C
Upper part of particle-size control section--dominantly volcanic ash; 5 to 20 percent rock fragments; 3 to 8 percent clay
Lower part of particle-size control section--averages 35 to 50 percent rock fragments and 18 to 27 percent clay in fine-earth fraction

Ash mantle
*Thickness--36 to 75 cm
*Moist bulk density--0.65 to 0.95 g/cm3
*Glass content--20 to 70 percent
*Acid oxalate aluminum plus 1/2 iron--1 to 3 percent
*Phosphorus retention--40 to 60 percent
*15-bar water retention--5 to 10 percent (air-dried samples)

Oi horizon
Thickness--3 to 8 cm

E horizon
Thickness--3 to 8 cm

A horizon
Thickness--5 to 13 cm

Bw horizon
Hue--10YR, 7.5YR
Value--3 or 4 moist, 5 or 6 dry
Chroma--3 or 4 moist or dry
Texture--ashy sandy loam, ashy fine sandy loam, gravelly ashy fine sandy loam
Combined thickness--28 to 61 cm

2Bt horizon
Value--4 or 5 moist
Chroma--3 or 4 moist or dry
Texture--very gravelly loam, extremely gravelly loam, very cobbly loam
Reaction--6.1 to 7.3
Combined thickness--89 to 114 cm

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--1075 to 1825 mm
Climate--cool, wet winters; warm, dry summers
Mean annual precipitation--1275 to 2300 mm
Mean January air temperature--about -6 degrees C
Mean July air temperature--about 16 degrees C
Mean annual air temperature--about 2 to 6 degrees C
Frost-free season--35 to 75 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Ravensroost--on ridges; moderately deep
Twolakes--on ridges and mountain slopes; skeletal in volcanic ash part of particle-size control section

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--high through volcanic ash layer, moderately high below volcanic ash layer

USE AND VEGETATION:
Use--mainly timber production, wildlife habitat, and watershed
Native vegetation--mountain hemlock, Pacific silver fir, subalpine fir, grand fir, Engelmann spruce, Cascade azalea, big huckleberry, queencup beadlily, beargrass, smooth woodrush

DISTRIBUTION AND EXTENT: Wenatchee National Forest, Naches Area, Kittitas and Yakima Counties, Washington; MLRA 3; small extent

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

SERIES ESTABLISHED: Wenatchee National Forest, Yakima County, Washington; 2003

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Ochric epipedon
*Cambic horizon--zone from 18 to 53 cm
*Argillic horizon--zone from 53 to 157 cm
*Andic soil properties--zone from 5 to 53 cm
*Particle-size control section--zone from 5 to 105 cm

---

National Cooperative Soil Survey
U.S.A.