LOCATION GRANDPON                WA

Established Series
Rev. JDC/RJE/KWH/RWL
09/2019

GRANDPON SERIES


Landscape--mountains
Landform--moutain slopes
Slope--0 to 60 percent
Parent material--volcanic ash over colluvium derived from basalt
Mean annual precipitation--about 810 mm
Mean annual air temperature--about 4 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 over loamy-skeletal, amorphic over isotic, frigid Humic Vitrixerands

TYPICAL PEDON: Grandpon ashy loam, forested, on a 15-percent, east-facing backslope at an elevation of 1350 m (All textures are apparent field textures.)

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

A1--3 to 10 cm; ashy loam, brown (7.5YR 4/2) dry, dark reddish brown (5YR 2/2) moist; weak very fine granular structure; soft, friable, slightly sticky and nonplastic; weakly smeary; many very fine and few fine roots; many fine irregular pores; slightly acid (pH 6.1); clear smooth boundary

A2--10 to 25 cm; ashy loam, brown (7.5YR 4/2) dry, dark reddish brown (5YR 2/2) moist; weak very fine granular structure; soft, very friable, slightly sticky and nonplastic; weakly smeary; common fine and very fine roots; many very fine irregular pores; 10 percent gravel; slightly acid (pH 6.1); clear smooth boundary

AB--25 to 55 cm; ashy loam, brown (7.5YR 4/2) dry, dark reddish brown (5YR 3/2) moist; weak very fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; weakly smeary; many very fine and common medium roots; many very fine irregular pores; 10 percent gravel; moderately acid (pH 6.0); NaF 10.7; gradual smooth boundary

BA--55 to 79 cm; ashy loam, reddish brown (5YR 5/3) dry, dark reddish brown (5YR 3/2) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine and few medium roots; many very fine irregular pores; 10 percent gravel; moderately acid (pH 5.8); NaF pH 10.7; gradual smooth boundary

2Bw--79 to 155 cm; very gravelly loam, brown (7.5YR 5/4) dry, dark reddish brown (5YR 3/4) moist; weak very fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine irregular pores; 35 percent gravel and 5 percent cobbles; moderately acid (pH 5.8)

TYPE LOCATION: Klickitat County, Washington, about 16 km north of Goldendale; about 310 m south and 760 m east of the northwest corner of section 34, T. 6 N., R. 16 E.; latitude 45 degrees, 58 minutes, 3 seconds north and longitude 120 degrees, 47 minutes, 30 seconds west

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--4 to 8 degrees C
Soil moisture control section--usually moist, but dry in all parts 45 to 60 consecutive days
Thickness of volcanic ash influence--65 to 90 cm
Depth to bedrock--150 cm or more
Reaction--5.6 to 6.5

Upper part of 0- to 100-cm particle-size control section
*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

Lower part of 0- to 100-cm particle-size control section
*Moist bulk density--1.25 to 1.55 g/cm3
*Clay content--15 to 20 percent
*Rock fragment content--35 to 60 percent

A and AB horizons
Hue--5YR, 7.5YR
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Combined thickness of A horizon--8 to 28 cm
Thickness of AB horizon--25 to 38 cm

BA horizon
Hue--5YR, 7.5YR
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 to 4 dry or moist
Texture--ashy loam, ashy very fine sandy loam
Gravel content--0 to 15 percent
Thickness--25 to 38 cm

2Bw horizon
Hue--5YR, 7.5YR
Value--4 or 5 dry, 3 or 4 moist
Chroma--3 or 4 dry or moist
Texture--very gravelly loam, very gravelly fine sandy loam, very gravelly very fine sandy loam
Clay content--15 to 20 percent
Gravel content--35 to 50 percent
Cobble content--5 to 15 percent

COMPETING SERIES: None

Series that has similar classification (except glassy mineralogy)
* Pinecreek--volcanic ash influence 36 to 55 cm thick; umbric epipedon 25 to 38 cm thick; metasedimentary rock fragments

GEOGRAPHIC SETTING:
Elevation--1225 to 1400 m
Climate--cool, dry summers; cool, moist winters; snow cover in November through May
Mean annual precipitation--640 to 890 mm
Mean January air temperature--about -7 degrees C
Mean July air temperature--about 14 degrees C
Mean annual air temperature--about 3 to 7 degrees C
Frost-free season--70 to 100 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Pird--on mountains; cryic soil temperature regime; ashy-skeletal
Satus--on mountains; loamy-skeletal

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--well drained
Saturated hydraulic conductivity (Ksat)--moderately high

USE AND VEGETATION:
Use--mainly timber production, livestock grazing, and wildlife habitat
Vegetation--grand fir, ponderosa pine, Douglas-fir, pinegrass, elk sedge, prince's pine, rose

DISTRIBUTION AND EXTENT: Klickitat and Yakima Counties, Washington; MLRA 6; small 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
*Umbric epipedon--zone from 3 to 79 cm
*Cambic horizon--zone from 79 to 155 cm
*Particle-size control section--zone from 28 to 104 cm

ADDITIONAL DATA:
Partial laboratory data--National Soil Survey Laboratory pedon number 7P149440


National Cooperative Soil Survey
U.S.A.