LOCATION HYPRAIRIE               WA

Established Series
Rev. EH/RJE/TLA
09/2019

HYPRAIRIE SERIES

Landscape--plateaus, hills
Landform--ridges, hillslopes
Slope--2 to 65 percent
Parent material--loess over old alluvium; sandstone colluvium and loess (high elevation phase)
Mean annual precipitation--about 560 mm
Mean annual air temperature--about 9 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, mixed, superactive, mesic Pachic Ultic Argixerolls

TYPICAL PEDON: Hyprairie silt loam, cultivated, on a 4-percent, southeast-facing slope at an elevation of 630 m

Ap--0 to 18 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; many fine irregular pores; moderately acid (pH 5.8); abrupt smooth boundary

A--18 to 46 cm; silt loam, dark grayish brown (10YR 4/2) dry, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, friable, nonsticky and slightly plastic; common very fine and few fine roots; many fine irregular pores and common fine and few coarse tubular pores; moderately acid (pH 5.9); clear smooth boundary

AB--46 to 64 cm; silt loam, brown (10YR 4/3) dry, dark brown (10YR 3/3) moist; weak fine and medium subangular blocky structure; soft, friable, nonsticky and slightly plastic; few very fine roots; common fine tubular pores and few fine irregular pores; moderately acid (pH 6.0); clear smooth boundary

2Bt1--64 to 122 cm; silt loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common fine tubular pores and few fine irregular pores; few faint clay films in pores; 10 percent gravel; slightly acid (pH 6.2); clear smooth boundary

2Bt2--122 to 150 cm; gravelly clay loam, yellowish brown (10YR 5/4) dry, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; common fine tubular pores and many fine and medium irregular pores; common distinct clay films on faces of peds and in pores; 25 percent gravel; slightly acid (pH 6.5)

TYPE LOCATION: Klickitat County, Washington, about 8 km northeast of Lyle; about 750 m north and 230 m west of the southeast corner of section 9, T. 3 N., R. 13 E.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--9 to 11 degrees C
Moisture control section--usually moist, but dry 60 to 75 consecutive days following summer solstice
Particle-size control section--18 to 35 percent clay; 5 to 25 percent gravel
Thickness of mollic epipedon--50 to 76 cm; includes A and AB horizons

Ap horizon
Thickness--13 to 20 cm

A horizon
Hue--7.5YR, 10YR
Value--4 or 5 dry, 2 or 3 moist
Chroma--2 or 3 dry or moist
Reaction--5.6 to 6.5
Thickness--20 to 36 cm

AB horizon
Hue--7.5YR, 10YR
Value--4 or 5 dry
Reaction--5.6 to 6.5
Thickness--0 to 25 cm

2Bt horizon
Hue--7.5YR, 10YR
Value--4 to 6 dry
Chroma--3 to 6 dry or moist
Texture--loam, silt loam, silty clay loam, clay loam
Reaction--6.1 to 7.3
Combined thickness--greater than 70 cm

COMPETING SERIES:
Aptos--50 to 100 cm (moderately deep) to a paralithic contact (sedimentary rock)
Buckeye--50 to 100 cm (moderately deep) to a lithic contact (greenstone)
Campfour--dry 80 to 100 consecutive days following summer solstice
Cartwright--5 to 25 percent granite gravel in particle-size control section; no discontinuity (2Bt horizon)
Elmore--100 to 150 cm (deep) to a lithic contact (rhyolite)
Kiakus--50 to 100 cm (moderately deep) to a lithic contact (basalt)
Lauby--dry 45 to 60 consecutive days following summer solstice
Mouser--mean annual soil temperature higher than 11 degrees C
Newlig--no discontinuity (2Bt horizon); 100 to 150 cm deep to base of argillic horizon
Nisene--100 to 150 cm (deep) to a paralithic contact (sandstone, shale); mean annual soil temperature of 13 to 14 degrees C
Paragon--50 to 100 cm (moderately deep) to a paralithic contact (andesite); dry 80 to 100 consecutive days
Roseburg--mean annual soil temperature of 11 to 14 degrees C; 100 to 150 cm deep to base of argillic horizon; 0 to 15 percent rounded gravel in particle-size control section
Swalecreek--dry 75 to 90 consecutive days
Yaxing--100 to 150 cm deep to base of argillic horizon; dry 75 to 90 consecutive days; pH of 7.4 to 7.8 throughout

GEOGRAPHIC SETTING:
Elevation--300 to 1025 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 20 degrees C
Mean annual air temperature--about 8 to 10 degrees C
Frost-free season--110 to 150 days

GEOGRAPHICALLY ASSOCIATED SOILS:
Gunn--ochric epipedon; on plateaus, benches, and side slopes
Leidl, Kiakus--50 to 100 cm (moderately deep) to a lithic contact (basalt); on plateaus and side slopes

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

USE AND VEGETATION:
Use--mainly crop production
Principal crops--small grain, hay and pasture
Native vegetation--Oregon white oak, antelope bitterbrush, Idaho fescue, bluebunch wheatgrass, arrowleaf balsamroot, eriogonum

DISTRIBUTION AND EXTENT: Klickitat County, Washington; MLRA 6; small extent

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

SERIES ESTABLISHED: Cashmere Mountain Area, Chelan County, Washington; 1995

REMARKS:
Diagnostic horizons recognized in this pedon
*Mollic epipedon--zone from the surface to a depth of 64 cm
*Argillic horizon--zone from 64 to 150 cm
*Particle-size control section--zone from 64 to 114 cm

4/2003--Further investigation is needed to determine the relationship of the Hyprairie series with the competing Yaxing series. The 60 to 75 dry days of the Hyprairie soils may be too low; it may be 60 to 90 days or even 75 to 90 days. The Hyprairie soils in the high elevation phase appear to be similar to the Yaxing soils in MLRA 6 that are underlain by sandstone.

ADDITIONAL DATA:
Laboratory data--characterization number S82WA-039-3

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National Cooperative Soil Survey
U.S.A.