LOCATION SEGIDAL                 WA

Established Series
Rev. AG/RWL/KDPL/KH
09/2019

SEGIDAL SERIES

Landscape--valleys
Landform--lacustrine terraces, floodplains
Slope--0 to 2 percent
Parent material--alluvium derived from basalt and volcanic ash
Mean annual precipitation--about 890 mm
Mean annual air temperature--about 6 degrees C
Depth class--moderately deep to cemented layer
Drainage class--somewhat poorly drained
Soil moisture regime--aquic
Soil temperature regime--frigid
Soil moisture subclass--typic

TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Typic Petraquepts

TYPICAL PEDON: Segidal sandy loam under lodgepole pine and ponderosa pine, on a 1-percent, south-facing slope at an elevation of 560 m

Oi--0 to 3 cm; needles and twigs

E1--3 to 10 cm; sandy loam, very pale brown (10YR 8/2) dry, brown (10YR 5/3) moist; weak fine subangular blocky structure; soft, friable, slightly sticky and slightly plastic; many very fine and fine roots; many very fine irregular pores; moderately acid (pH 5.9); clear smooth boundary

E2--10 to 33 cm; sandy loam, white (10YR 8/1) dry, brown (10YR 5/3) moist; weak medium platy structure; slightly hard, friable, slightly sticky and nonplastic; common very fine and fine and few medium roots; common very fine irregular pores and many very fine tubular pores; few fine prominent reddish yellow (7.5YR 6/6) redoximorphic concentrations; moderately acid (pH 5.8); clear smooth boundary

E3--33 to 53 cm; loam, light gray (10YR 7/1) dry, grayish brown (10YR 5/2) moist; few fine prominent redoximorphic concentrations, reddish yellow (7.5YR 6/8) moist or dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; few very fine irregular pores and common very fine tubular pores; slightly acid (pH 6.1); gradual smooth boundary

Bs--53 to 74 cm; sandy loam, light yellowish brown (10YR 6/4), pale yellow (2.5Y 8/2), and reddish yellow (7.5YR 6/8) dry, yellowish brown (10YR 5/4), light brownish gray (2.5Y 6/2), and reddish yellow (7.5YR 6/8) moist; massive; slightly hard, firm, slightly sticky and nonplastic; many very fine and fine and few medium roots; many very fine irregular pores and few very fine tubular pores; 5 percent gravel; slightly acid (pH 6.2); gradual smooth boundary

Bsm1--74 to 109 cm; strongly cemented material that breaks to sandy loam, brownish yellow (10YR 6/6), white (10YR 8/1), and strong brown (7.5YR 5/6) dry, dark yellowish brown (10YR 4/6), light brownish gray (2.5Y 6/2), and strong brown (7.5YR 5/6) moist; massive; extremely hard, very firm, slightly sticky and nonplastic; many very fine and fine roots in cracks, few very fine irregular and tubular pores; 10 percent gravel; neutral (pH 6.6); abrupt wavy boundary

Bsm2--109 to 127 cm; strongly cemented material that breaks to sandy loam, light yellowish brown (10YR 6/4), light gray (10YR 7/1), and strong brown (7.5YR 5/6 and 7.5YR 5/8) dry, yellowish brown (10YR 5/4), light brownish gray (10YR 6/2), and yellowish red (5YR 5/6 and 5YR 5/8) moist; massive; extremely hard, extremely firm, nonsticky and nonplastic; few very fine tubular pores; 10 percent gravel; neutral (pH 6.7); abrupt smooth boundary

2Bsm3--127 to 155 cm; stratified, weakly cemented sand, silt, and gravel that break to gravelly sandy loam, light gray (10YR 7/1) dry, grayish brown (10YR 5/2) moist; many fine prominent redoximorphic concentrations, strong brown (7.5YR 5/6) moist or dry; hard, firm, nonsticky and nonplastic; very few very fine roots; common fine irregular pores; 20 percent gravel; neutral (pH 6.7)

TYPE LOCATION: Klickitat County, Washington, about 4 km south of Glenwood; about 150 m south and 760 m west of the northeast corner of section 27, T. 6 N., R. 12 E.; latitude 45.9849994, longitude -121.2919464, datum WGS 84 (coordinates estimated from section, township, and range)

RANGE IN CHARACTERISTICS:
Mean annual soil temperature--7 to 8 degrees C
Depth to strongly cemented layer--50 to 100 cm
Thickness of cemented layer--25 to 75 cm
Rock fragment content in particle-size control section--0 to 10 percent

E horizon
Value--4 or 5 moist, 6 to 8 dry
Chroma--2 or 3 moist, 1 or 2 dry
Gravel content--0 to 10 percent
Reaction--5.6 to 6.5
Combined thickness--35 to 77 cm

Bs horizon
Hue--10YR, 2.5Y
Value--4 to 6 moist, 7 or 8 dry
Chroma--1 or 2 moist or dry
Texture--loam, sandy loam
Reaction--6.1 to 7.3
Thickness--15 to 25 cm

Bsm horizon
Co-dominant hue, value and chroma
Hue--5YR to 10YR
Value--4 to 6 moist, 5 or 6 dry
Chroma--4 to 8 moist or dry
and
Hue--10YR, 2.5Y
Value--4 to 6 moist, 7 or 8 dry
Chroma--1 or 2 moist or dry
Texture--strongly cemented material that breaks to loam or sandy loam
Reaction--6.1 to 7.3
Combined thickness--26 to 107 cm

2Bsm horizon
Hue--10YR, 2.5Y
Value--5 or 6 moist, 7 or 8 dry
Chroma--1 or 2 moist or dry
Gravel content--15 to 30 percent
Cementation--discontinuous, weak to strong
Reaction--6.1 to 7.3

COMPETING SERIES: None

GEOGRAPHIC SETTING:
Elevation--550 to 730 m
Climate--warm, dry summers; cold, wet winters; snow cover in December through March
Mean annual precipitation--840 to 940 mm
Mean January air temperature--about -3 degrees C
Mean July air temperature--about 19 degrees C
Mean annual air temperature--about 6 to 7 degrees C
Frost-free season--50 to 90 days, but a damaging frost can occur any month of the year

GEOGRAPHICALLY ASSOCIATED SOILS:
Conboy--irregular decrease in organic carbon; in lake basins
Glen, Pinbit--xeric soil moisture regime; ashy particle-size class; on low terraces
Grayland--fine particle-size class; on lacustrine terraces
Guler--xeric soil moisture regime; ashy-skeletal particle-size class; on mountain footslopes

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--somewhat poorly drained
Saturated hydraulic conductivity (Ksat)--moderately high above the cemented layer, moderately low through the cemented layer
Depth to seasonal perched water table--15 to 60 cm in January through April
Ponding--long periods in November through June in some areas

USE AND VEGETATION:
Use--mainly pasture and hay production, wildlife habitat, and timber production
Native vegetation--mainly lodgepole pine, ponderosa pine, hardhack, shrubby penstemon, peavine, kinnikinnick, elk sedge

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

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

SERIES ESTABLISHED: Yakama Nation, Klickitat County, Washington; 2014

REMARKS:
Diagnostic horizons and other features recognized in this pedon
*Albic horizon--zone from 3 to 53 cm
*Cambic horizon--zone from 53 to 127 cm
*Cemented layer--zone from 74 to 127 cm
*Particle-size control section--zone from 28 to 103 cm

The classification of this series was changed from coarse-loamy, mixed, superactive, frigid, ortstein Typic Epiaquods to coarse-loamy, mixed, superactive, frigid, ortstein Typic Duraquods based on the continuously cemented Bsm horizon. The laboratory data does not support the Bs or Bsm horizons as spodic material (pH too high and organic carbon too low); therefore, the classification was changed to Typic Petraquepts.

ADDITIONAL DATA: Partial laboratory data--number S78WA-039-004

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National Cooperative Soil Survey
U.S.A.