LOCATION DINKELS WAEstablished Series
TAXONOMIC CLASS: Ashy, glassy, mesic Vitrandic Haploxerolls
TYPICAL PEDON: Dinkels gravelly ashy loam-rangeland; on a 65 percent slope at an elevation; of 1,200 feet. (Colors are for dry soils unless otherwise noted.
A1--0 to 6 inches, grayish brown (10YR 5/2) gravelly ashy loam, very dark grayish brown (10YR 3/2) moist; weak, medium granular structure; soft, very friable, nonsticky and nonplastic; many very fine and fine roots; common very fine interstitial pores; 10 percent sand size pumice 0.5 to 2.0 mm and 5 percent pumice 2 to 5 mm in diameter; 15 percent gravel and 5 percent cobbles; neutral, (pH 7.0); gradual smooth boundary. (4 to 7 inches thick)
A2--6 to 18 inches, brown (10YR 5/3) gravelly ashy loam, very dark grayish brown (10YR 3/2) moist; weak, medium granular structure; soft, very friable, nonsticky and nonplastic; many very fine roots; common very fine interstitial pores; 10 percent sand size pumice 0.5 to 2.0 mm and 5 percent pumice 2 to 5 mm in diameter; 15 percent gravel and 5 percent cobbles; neutral, (pH 7.0) gradual smooth boundary. (10 to 13 inches thick)
Bw1--18 to 28 inches, pale brown (10YR 6/3) gravelly ashy fine sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine roots; few fine interstitial pores; 10 percent sand size pumice 0.5 to 2.0 mm and 5 percent pumice 2 to 5 mm in diameter; 20 percent gravel and 5 percent cobbles; neutral, (pH 7.2); gradual wavy boundary. (8 to 12 inches thick)
Bw2--28 to 41 inches, pale brown (10YR 6/3) very gravelly ashy fine sandy loam, brown (10YR 4/3) moist; massive; soft, very friable, nonsticky and nonplastic; few fine roots; few fine and medium interstitial pores; 5 percent sand size pumice 0.5 to 2.0 mm and 5 percent pumice 2 to 5 mm in diameter; 25 percent gravel and 10 percent cobbles; slightly alkaline (pH 7.4), abrupt wavy boundary. (10 to 15 inches thick)
R--41 inches, gneiss.
TYPE LOCATION: Douglas County, Washington; about l mile east of Orondo, Washington, about 700 feet west and 200 feet south of the northeast corner of Section 33, T. 25 N., R. 21 E. Latitude - 47 degrees, 37 minutes, 35 seconds north; Longitude - 120 degrees, 12 minutes, 20 seconds west.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 47 to 49 degrees F. These soils are usually moist but are dry in the moisture control section for 90 to 105 consecutive days following summer solstice. The mollic epipedon is 14 to 20 inches thick. Base saturation by sum of base is 75 to 100 percent throughout. The particle-size control section averages 15 to 35 percent coarse fragments, and contains 30 to 60 percent glass and glass aggregate. Field estimated clay content is 4 to 10 percent. Acid oxalate extractable aluminum plue one-half the iron is 0.15 to 0.40 percent. The 15 bar water retention on air dried samples is 5 to 10 percent. Solum thickness and depth to bedrock ranges from 40 to 60 inches. Soil reaction is neutral or slightly alkaline.
The A horizon has chroma of 2 or 3 dry or moist.
The Bw horizon has value of 5 or 6 dry, 4 or 5 moist, and chroma of 2 to 4 moist and dry. It is ashy loam, ashy sandy loam, or ashy fine sandy loam in the upper part and ashy coarse sandy loam, ashy sandy loam, or ashy fine sandy loam in the lower part.
The C horizon, when present, has value of 6 dry, 4 or 5 moist, and chroma of 3 or 4 moist and dry. It is gravelly coarse sandy loam, gravelly sandy loam, very gravelly coarse sandy loam, very gravelly sandy loam, or very cobbly coarse sandy loam.
COMPETING SERIES: These are the Achelake, Hardister, Mansonia, Nemire, Shiva, and Watco series. Achelake, Hardister, Nemire, and Shiva soils are over 60 inches deep. Mansonia soils have a mollic epipedon 7 to 12 inches thick and contain 5 to 35 percent gravel size pumice. Watco soils are dry for 75 to 90 days and have glacial till at 40 to 60 inches.
GEOGRAPHIC SETTING: Dinkels soils are on side slopes of plateaus and mountain side slopes that generally have a northerly aspect. Slopes are 5 to 70 percent. These soils formed in colluvium from granite, granodiorite and gneiss mixed with loess, volcanic ash and pumice. Elevations are 700 to 3,000 feet. These soils are in a climate with warm, dry summers and cool, moist winters. The mean annual precipitation is l2 to 18 inches. The average January temperature is about 24 degrees F. and the average July temperature is about 69 degrees F, The mean annual air temperature is about 46 degrees F. The frost-free season is 90 to l55 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Badge, Dinkelman, Entiat, Shamel, and Tyee soils. Badge and Entiat soils are loamy-skeletal. Dinkelman and Shamel soils are frigid. Tyee soils are l0 to 20 inches deep to a paralithic contact.
DRAINAGE AND PERMEABILITY: Well drained; slow to very rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used mostly for rangeland and wildlife habitat. Some is used for dryland crops. Native vegetation is bluebunch wheatgrass, Sandberg bluegrass, Idaho fescue, antelope bitterbrush, and scattered Douglas-fir and ponderosa pine.
DISTRIBUTION AND EXTENT: North central Washington; MLRA 8 . The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Douglas County, Washington, l979.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon from the surface to 18 inches
Cambic horizon - from 18 to 41 inches
Lithic contact - at 41 inches
Particle-size control section from 10 to 40 inches
Classification revised 3/97 from coarse-loamy, mixed, mesic Typic Haploxerolls to ashy, glassy, mesic Vitrandic Haploxerolls.