LOCATION SEGIDAL WATentative Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid, ortstein Typic Duraquods
TYPICAL PEDON: Segidal sandy loam - on a 1 percent south-facing slope under lodgepole pine and ponderosa pine at 1,825 feet elevation. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 0.75 inches; needles and twigs.
Oa--0.75 to 1 inch; decomposed needles and twigs.
E1--1 to 4 inches; brown (10YR 5/3) sandy loam, very pale brown (10YR 8/2) dry; 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. (3 to 5 inches thick)
E2--4 to 13 inches; brown (10YR 5/3) sandy loam, white (10YR 8/1) dry; few fine prominent mottles of reddish yellow (7.5YR 6/6) moist and dry; weak medium platy structure; slightly hard, friable, slightly sticky and nonplastic; common very fine, fine and few medium roots; common very fine irregular and many very fine tubular pores; moderately acid (pH 5.8); clear smooth boundary. (8 to 14 inches thick)
E3--13 to 21 inches; grayish brown (10YR 5/2) loam, light gray (10YR 7/1) dry; few fine prominent redox concentrations of reddish yellow (7.5YR 6/8) moist and dry; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine roots; few very fine irregular and common very fine tubular pores; moderately acid (pH 6.l); gradual smooth boundary. (6 to 11 inches thick)
Bs--21 to 29 inches; yellowish brown (10YR 5/4), light brownish gray (2.5Y 6/2), and reddish yellow (7.5YR 6/8) sandy loam, light yellowish brown (10YR 6/4), pale yellow (2.5Y 8/2), and reddish yellow (7.5YR 6/8) dry; massive; slightly hard, firm, slightly sticky and nonplastic; many very fine, fine and few medium roots; many very fine irregular and few very fine tubular pores; 5 percent gravel; slightly acid (pH 6.2); gradual smooth boundary. (6 to 10 inches thick)
Bsml--29 to 43 inches; dark yellowish brown (10YR 4/6), light brownish gray (2.5Y 6/2), and strong brown (7.5YR 5/6) strongly cemented ortstein that breaks to sandy loam, brownish yellow (10YR 6/6), white (10YR 8/1), and strong brown (7.5YR 5/6) dry; massive; extremely hard, very firm, slightly sticky and nonplastic; many very fine and fine roots in cracks, few very fine irregular and few very fine tubular pores; 10 percent gravel; neutral (pH 6.6); abrupt wavy boundary. (5 to 16 inches thick)
Bsm2--43 to 50 inches; yellowish brown (10YR 5/4), light brownish gray (10YR 6/2), and yellowish red (5YR 5/6 and 5YR 5/8) strongly cemented ortstein 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; massive; extremely hard, extremely firm, nonsticky and nonplastic; few very fine tubular pores; 10 percent gravel; neutral (pH 6.7); abrupt smooth boundary. (5 to 26 inches thick)
2C--50 to 61 inches; grayish brown (10YR 5/2) stratified weakly cemented sand, silt and pebbles that break to gravelly sandy loam, light gray (10YR 7/1) dry; many fine prominent redox concentrations of strong brown (7.5YR 5/6) moist and 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 2 1/2 miles south of Glenwood; 500 feet south and 2,550 feet west of the northeast corner of section 27, T. 6 N., R. 12 E.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 44 to 47 degrees F. Depth to the ortstein layer is 20 to 40 inches. Thickness of the ortstein layer is 10 to 30 inches. Rock fragments in the control section range from 0 to 10 percent.
The E horizon has value of 4 or 5 moist, 6 to 8 dry and chroma of 2 or 3 moist, 1 or 2 dry. It has 0 to 10 percent gravel. Reaction is moderately acid or slightly acid.
The Bs horizon has hue of 10YR or 2.5Y, value of 4 to 6 moist, 7 or 8 dry and chroma of 1 or 2 moist and dry. Texture is loam or sandy loam. Reaction is slightly acid or neutral.
The Bsm horizon has co-dominant hues of 5YR to 10YR, value of 4 to 6 moist, 5 or 6 dry and chroma of 4 to 8 moist and dry and hues of 10YR or 2.5Y, value of 4 to 6 moist, 7 or 8 dry and chroma of 1 or 2 moist and dry. It is strongly cemented ortstein that breaks to loam or sandy loam. Reaction is slightly acid or neutral.
The 2C horizon has hue of 10YR or 2.5Y, value of 5 or 6 moist, 7 or 8 dry and chroma of 1 or 2 moist and dry. It has 15 to 30 percent gravel. It is weakly to strongly cemented. Reaction is slightly acid or neutral.
COMPETING SERIES: There are no competing series. The Custer series is in a sandy family. Custer soils are sandy and have mesic soil temperature regimes.
GEOGRAPHIC SETTING: Segidal soils are on lacustrine terraces at elevations of 1,800 to 2,400 feet. Slopes are 0 to 2 percent. The soils formed in alluvium from basalt and volcanic ash. Summers are warm and dry; winters are cold and wet with snow cover from December through March. The mean annual precipitation is 33 to 37 inches. The average January temperature is 27 degrees F. and the average July temperature is 66 degrees F. The mean annual temperature is 42 to 45 degrees F. The frost-free season is 50 to 90 days, although a damaging frost can occur any month of the year.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Conboy, Glen, Grayland, Guler, and Pinbit soils. All of these soils lack a spodic horizon. In addition, Conboy soils have an irregular decrease in organic carbon and are in lake basins. Glen and Pinbit soils have a xeric moisture regime, are ashy and are on low terraces. Grayland soils are fine and are on lacustrine terraces. Guler soils have a xeric moisture regime, are ashy-skeletal and are on mountain footslopes.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; very slow runoff; moderately permeable above the ortstein and slowly permeable through the ortstein. A perched seasonal high water table is at 0.5 to 2.0 feet from January to April. Some pedons have long periods of ponding from November to June.
USE AND VEGETATION: These soils are used mainly for pasture, hay production, wildlife habitat, and timber production. Native vegetation is mainly lodgepole pine and ponderosa pine, with an understory of hardhack, shrubby penstemon, peavine, kinnikinnick, and elk sedge.
DISTRIBUTION AND EXTENT: Glenwood Valley, Klickitat County, Washington. MLRA 6. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES PROPOSED: Klickitat County, Washington, 1977; Yakima Indian Reservation.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Albic horizon - the zone from 1 to 21 inches
Spodic horizon - the zone from 21 to 50 inches consisting of ortstein from 29 to 50 inches.
Weakly cemented sand and gravel - the zone beginning at 50 inches
Aquic moisture regime
Particle-size control section - the zone from 11 to 41 inches
Depths to diagnostic horizons and features are measured from the top of the first mineral horizon.
Series reclassified 08/03 from coarse-loamy, mixed, superactive, frigid, ortstein Typic Epiaquods to coarse-loamy, mixed, superactive, frigid, ortstein Typic Duraquods based on presence of continuously cemented Bsm horizon.
Note: 04/03 - Further investigation is needed on this soil as it relates to the presence of spodic materials. The current spodic horizon as defined does not meet the pH or organic carbon requirement and, in addition, has colors that are both within and without of the acceptable range.
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2/2005 This series originally set up within the Klickitat County soil survey until boundary change with Yakima Indian Reservation soil survey in 2003.
ADDITIONAL DATA: Partial laboratory data are available for this pedon (S78WA-039-004).