LOCATION GUNN                    WA

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

GUNN SERIES

Landscape--plateaus, hills
Landform--structural benches, hillslopes, ridgetops
Slope--0 to 65 percent
Parent material--loess mixed with colluvium and residuum derived from basalt
Mean annual precipitation--about 530 mm
Mean annual air temperature--about 9 degrees C
Depth class--deep, very deep
Drainage class--well drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--typic

TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Ultic Haploxeralfs

TYPICAL PEDON: Gunn loam, forested, on a 3-percent, southeast-facing slope at an elevation of 540 m

A1--0 to 15 cm; loam, brown (7.5YR 5/3) dry, dark brown (7.5YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and few medium roots; many fine interstitial pores; slightly acid (pH 6.2); abrupt smooth boundary

A2--15 to 25 cm; loam, light brown (7.5YR 6/3) dry, brown (7.5YR 4/4) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and few coarse roots; common fine tubular pores; moderately acid (pH 6.0); clear wavy boundary

BAt--25 to 46 cm; loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; moderate fine and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine and few medium roots; common fine and medium tubular pores; few faint clay films on faces of peds; slightly acid (pH 6.2); clear wavy boundary

Bt1--46 to 86 cm; clay loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; moderate fine and medium subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; common fine and medium tubular pores; common distinct clay films on faces of peds; slightly acid (pH 6.2); gradual wavy boundary

Bt2--86 to 114 cm; clay loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; moderate fine and medium subangular blocky structure; very hard, firm, moderately sticky and moderately plastic; few very fine roots; many fine and many medium tubular pores; common distinct clay films on faces of peds; slightly acid (pH 6.2); clear wavy boundary

BCt--114 to 168 cm; clay loam, light brown (7.5YR 6/4) dry, brown (7.5YR 4/4) moist; moderate coarse subangular blocky structure; very hard, friable, slightly sticky and slightly plastic; few very fine roots between peds; many fine and medium tubular pores; many distinct clay films on faces of peds; slightly acid (pH 6.2)

TYPE LOCATION: Klickitat County, Washington; about 760 m north and 790 m east of the southwest corner of section 25, T. 5 N., R. 14 E.; latitude 45.890135, longitude -120.998886, datum WGS 84 (coordinates estimated from section, township, and range)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--8 to 11 degrees C
Soil moisture control section--usually moist, but dry in all parts 90 to 105 consecutive days
Depth to bedrock--100 to 150 cm or more to lithic contact
Rock fragment content in particle-size control section--0 to 10 percent
Clay content in particle-size control section--22 to 35 percent
Reaction--5.6 to 6.5 throughout

A horizon
Hue--7.5YR, 5YR
Value--4 to 6 dry, 3 or 4 moist
Chroma--2 to 6 dry or moist
Textural modifier--stony in some pedons
Combined thickness--18 to 36 cm

Bt horizon
Hue--7.5YR, 5YR
Value--5 or 6 dry, 3 or 4 moist
Chroma--2 to 4 dry or moist
Texture--loam, clay loam
Combined thickness--38 to 76 cm

BCt horizon
Hue--7.5YR, 5YR
Value--5 or 6 dry, 3 or 4 moist
Chroma--4 to 6 dry
Texture of fine-earth fraction--loam, clay loam
Gravel content--0 to 30 percent
Paragravel content--0 to 45 percent
Thickness--25 to 76 cm

COMPETING SERIES:
Beal--dry 45 to 60 consecutive days following summer solstice; 75 to 100 cm to low-chroma redoximorphic depletions; 40 to 65 cm to redoximorphic concentrations; Bt horizon that has hue of 10YR to 5Y
Boardburn--100 to 150 cm (deep) to a paralithic contact (andesitic tuff); dry 110 to 130 consecutive days following summer solstice
Boomer--100 to 200 cm (deep, very deep) to a paralithic contact (greenstone); dry 105 to 130 consecutive days following summer solstice
Casabonne--mean annual soil temperature of 12 to 15 degrees C
Cherryhill--100 to 150 cm (deep) to a paralithic contact (tuffaceous sandstone); dry 60 to 80 consecutive days following summer solstice
Cle Elum--50 to 100 cm (moderately deep) to a paralithic contact (sandstone); dry 75 to 90 consecutive days following summer solstice
Crozier--50 to 100 cm (moderately deep) to a lithic or paralithic contact (andesitic breccia); dry 120 to 150 consecutive days following summer solstice
Dalig, Hood--dry 60 to 75 consecutive days following summer solstice
Fives, Para--dry 45 to 60 consecutive days following summer solstice
Fong--C horizon that has coarser textures and 50 to 65 percent gravel
Fordcreek--100 to 150 cm (deep) to a paralithic contact (granite)
Katykat--mean annual soil temperature of more than 11 degrees C; dry more than 120 days
Latourell--45 to 80 consecutive days following summer solstice; mean annual soil temperature of 12 to 15 degrees C
Lettia--100 to 150 cm (deep) to a paralithic contact (granodiorite); dry 45 to 60 consecutive days following summer solstice
Norling--50 to 100 cm (moderately deep) to a paralithic contact (metavolcanic rock); dry 45 to 60 consecutive days following summer solstice
Pishpishee--10 to 30 percent metasedimentary rock fragments in particle-size control section
Rosehaven--45 to 60 consecutive days following summer solstice; mean annual soil temperature of 11 to 14 degrees C
Sanhedrin--C horizon that has gravel (in lieu of texture)
Tigit--50 to 100 cm (moderately deep) to a paralithic contact (basalt); dry 60 to 75 consecutive days following summer solstice
Varelum--100 to 150 cm or more (deep, very deep) to a paralithic contact (sandstone); dry 60 to 75 consecutive days following summer solstice
Wohly--50 to 100 cm (moderately deep) to a paralithic contact (sandstone, shale)

GEOGRAPHIC SETTING:
Elevation--180 to 1150 m
Climate--warm, dry summers; cool, moist winters
Mean annual precipitation--380 to 640 mm
Mean January air temperature--about -2 degrees C
Mean July air temperature--about 19 degrees C
Mean annual air temperature--about 8 to 10 degrees C
Frost-free season--100 to 150 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Goldendale--on plateaus; mollic epipedon
Itat--on plateaus
Kiakus--on plateaus; 50 to 100 cm (moderately deep) to a lithic contact (basalt)
Leidl--on canyonsides; loamy-skeletal particle-size class; no argillic horizon
Munset--in depressions; 50 to 100 cm (moderately deep) to a lithic contact (basalt)
Quiden--on plateaus; no argillic horizon
Wahoo--on canyon breaks; loamy-skeletal particle-size class; no argillic horizon

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, and crop production
Principal crops--wheat, alfalfa, pasture
Native vegetation--dominantly ponderosa pine and Oregon white oak and scattered Douglas-fir; understory of redstem ceanothus, snowbrush ceanothus, pinemat manzanita, squawcarpet, elk sedge, Oregon grape, Idaho fescue, bluebunch wheatgrass, antelope bitterbrush, poison oak, yarrow, and lupine

DISTRIBUTION AND EXTENT: Central Klickitat County, 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 168 cm
*Particle-size control section--zone from 46 to 96 cm

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National Cooperative Soil Survey
U.S.A.