LOCATION ODO WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Typic Haploxerolls
TYPICAL PEDON: Odo loam, under a coniferous forest on a 20 percent northeast-facing slope at an elevation of 3,000 feet. The soil was moist when described. (Colors are for dry soil unless otherwise stated.)
0e--0 to 1 inches; partially decomposed forest litter; abrupt wavy boundary. (0.5 to 1 inches thick)
A1--1 to 11 inches; very dark grayish brown (10YR 3/2) loam, very dark brown (10YR 2/2) moist; moderate medium granular structure; soft, very friable, nonsticky and nonplastic; common fine and medium roots; few very fine tubular pores; 5 percent gravel; neutral (pH 6.6) clear wavy boundary. (8 to 18 inches thick)
A2--11 to 19 inches; dark brown (10YR 3/3) loam, very dark grayish brown (10YR 3/2) moist; moderate medium granular structure; soft, very friable, nonsticky and nonplastic; common fine, medium and very fine roots; few very fine tubular pores; 5 percent gravel; neutral (pH 6.6) abrupt wavy boundary. (0 to 10 inches thick)
Bw1--19 to 32 inches; dark yellowish brown (10YR 4/4) loam, dark yellowish brown (10YR 3/4) moist; weak medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium and many very fine roots; common very fine tubular pores; 10 percent gravel; slightly acid (pH 6.4) clear wavy boundary. (10 to 20 inches thick)
Bw2--32 to 60 inches; dark yellowish brown (10YR 4/4) gravelly loam, dark yellowish brown (10YR 3/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine, medium roots; common very fine tubular pores; 30 percent gravel; slightly acid (pH 6.4).
TYPE LOCATION: Kittitas County, Washington; about 8 miles west of Ellensburg, 2,400 feet south and 450 feet west of the northeast corner of section 29, T. 18 N., R. 17 E.; USGS Thorp, Washington topographic quadrangle; Latitude 47 degrees, 01 minute, 18 seconds N. and Longitude 120 degrees, 43 minutes, 57 seconds W. (NAD83).
RANGE IN CHARACTERISTICS: The average annual soil temperature is 48 to 51 degrees F. These soils are usually moist, but are dry in all parts in the moisture control section for 75 to 90 consecutive days during summer and fall. The mollic epipedon is 12 to 20 inches thick. The solum is more than 60 inches thick. [SW2]The particle-size control section averages 18 to 25 percent clay.
The A horizon has value of 3 or 4 dry, 2 or 3 moist and chroma of 2 or 3, dry and moist. Texture of the A1 horizon is loam or cobbly silt loam[SW3]. Texture of the A2 horizon is loam or gravelly loam with 15 to 20 percent clay. . Reaction for both horizons is slightly acid or neutral.
The Bw horizon has hue of 10YR or 7.5YR, value of 4 or 5 dry and chroma of 3 or 4, dry or moist. Texture is loam or gravelly loam.[SW4]
COMPETING SERIES: These are the
Crowshaw,
Greenscombe,
Laki, and
Tocaloma series.
Crowshaw soils have a solum 22 to 35 inches thick; have substratum with 20 to 65 percent rock fragments of sandstone or limestone origin.
Laki soils dry for 45 to 70 consecutive days following the summer solstice; are calcareous throughout.
Tocaloma soils have a paralithic contact at 20 to 40 inches.
GEOGRAPHIC SETTING: Odo soils are on hillsides and canyonsides and have slopes of 0to 40 percent. These soils formed in residuum and colluvium from Yakima basalt with an influence of loess and minor amounts of volcanic ash in the surface. Elevation is 2,000 to 3,200 feet. These soils are in a climate with warm dry summers and cool moist winters. The mean annual precipitation is 15 to 19 inches. The average January temperature is about 27 degrees F. and the average July temperature is about 69 degrees F. and the mean annual air temperature is 46 to 48 degrees F.. The [SW5]frost-free season is 145 to 180 days. .
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Clint, Meystre, Rock Creek, Stemilt, and Sutkin series. Clint soils are on canyonsides, are loamy-skeletal, and have lithic contact at a depth of 20 to 40 inches. Meystre soils have an argillic horizon. Rock Creek soils are on ridgetops and plateaus, are clayey-skeletal and 8 to 20 inches to bedrock. Stemilt and Sutkin soils are loamy-skeletal and frigid.
DRAINAGE AND PERMEABILITY: Well-drained; medium runoff; moderate permeability.
USE AND VEGETATION: These soils are used for grazable woodland, recreation, and wildlife habitat. Vegetation is ponderosa pine, Oregon white oak, and scattered Douglas-fir with an understory of pinegrass, Saskatoon serviceberry, common snowberry, creambush oceanspray, antelope bitterbrush, and white spirea.
DISTRIBUTION AND EXTENT: East slopes of the Cascade Mountains in southern Kittitas County and northern Yakima County, Washington, MLRA 6. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Yakima County, Washington, 1979.
REMARKS: Diagnostic horizons and feature recognized in this pedon are:
Mollic epipedon - the zone from 1 to 19 inches
Cambic horizon - the zone from 18 to 60 inches
It is assumed the base saturation in the upper 30 inches of the soil is 75 percent or more. Laboratory data is needed to confirm this assumption.