LOCATION DINKELMAN WAEstablished Series
TAXONOMIC CLASS: Coarse-loamy, isotic, frigid Vitrandic Haploxerolls
TYPICAL PEDON: Dinkelman gravelly ashy sandy loam - forested. (Colors are for dry soil unless otherwise noted.)
Oe--0 to 2 inches; partially decomposed needles, twigs, cones, and dry grass.
A1--2 to 5 inches; grayish brown (10YR 5/2) gravelly ashy sandy loam, very dark grayish brown (10YR 3/2) moist; massive; soft, friable, slightly sticky and nonplastic; common medium and coarse roots; many fine and medium tubular pores; 25 percent gravel; slightly acid (pH 6.5); gradual wavy boundary.
A2--5 to 17 inches; grayish brown (10YR 5/2) gravelly ashy sandy loam, dark brown (10YR 3/3) moist; weak fine granular structure; soft, friable, slightly sticky and nonplastic; common fine medium and coarse roots; many fine and medium tubular pores; 30 percent gravel; slightly acid (pH 6.5); gradual wavy boundary. (combined thickness of the A horizon is 10 to 20 inches)
Bw--17 to 44 inches; light yellowish brown (10YR 6/4) gravelly sandy loam, brown (10YR 4/3) moist; massive; slightly hard, friable, slightly sticky and nonplastic; few medium and coarse roots; many fine and medium tubular pores; 25 percent gravel; neutral (pH 7.0); clear wavy boundary. (10 to 40 inches thick)
Cr--44 inches; weathered granodiorite.
TYPE LOCATION: Chelan County, Washington; Entiat Ranger District, 1.6 miles up Oklahoma Gulch from Navarre Coulee, first spur road to left across abandoned farmyard; 1,500 feet east and 2,600 feet south of the northwest corner section 8, T. 26 N., R. 21 E., W.M.
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 44 to 47 degrees F. Depth to bedrock is 40 to 60 inches to a paralithic contact. [r1]The particle-size control section averages 15 to 35 percent rock fragments and 25 to 35 percent coarse and very coarse sand. The upper 7 to 15 inches of the mollic epipedon has an estimated moist bulk density of 1.20 to 1.40 g/cc, volcanic glass content of 5 to 20 percent, acid-oxalate extractable aluminum plus one-half of the acid-oxalate extractable iron of 0.4 to 1.0 percent, and 15-bar water retention of 5 to 12 percent for air dried samples. The mollic epipedon is 10 to 20 inches thick. These soils are usually moist, but are dry in all parts for 60 to 75 consecutive days. The soils are slightly acid to slightly alkaline throughout. Base saturation is less than 75 percent in some part about the 30 inches depth.
The A horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 1 to 3 dry or moist. This horizon is massive or has weak structure.
The Bw horizon has value of 5 to 7 dry, 3 to 5 moist, and chroma of 3 or 4 moist or dry. It is fine sandy loam, gravelly sandy loam, gravelly coarse sandy loam, or gravelly loam. This horizon has weak structure or is massive. Some pedons have a C horizon.
COMPETING SERIES: These are the Bunchpoint, Kilmerque, Lani (T), Lostcreek, Republic and Thrapp series. Lostcreek soils are dry for 45 to 60 consecutive days and are very deep. Republic soils average 15 to 25 percent coarse plus very coarse sand in the particle-size control section, and 5 to 35 percent rounded rock fragments of till origin, and are very deep. Bunchpoint soils are 20 to 40 inches to a lithic contact. Kilmerque soils are 20 to 40 inches to a paralithic contact. Thrapp soils are 36 to 45 inches to a densic contact. Lani soils are very deep.
GEOGRAPHIC SETTING: Dinkelman soils are on mountain side slopes at elevations of 1,800 to 3,700 feet. Most have north or east aspect. The slopes range from 0 to 90 percent. These soils formed in material weathered from granitic rock with volcanic ash influence. Some pedons contain some rounded glacial gravel. These soils are in a climate with warm, dry summers and cool, moist winters. The mean January temperature is about 24 degrees F. and the mean July temperature is about 65 degrees F. The mean annual temperature is about 44 degrees F. The mean annual precipitation is 15 to 24 inches. The frost-free season is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bisping, Centralpeak, Dragoon, McCree, Morical, Nevine, Palmich, Spokane, Switchback, and Tyee soils. Bisping, McCree, Nevine, and Palmich soils have more than 60 percent pyroclastic materials. Centralpeak and Spokane soils have a paralithic contact at a depth of 20 to 40 inches. Dragoon and Morical soils have an argillic horizon and are 20 to 40 inches deep. Switchback soils lack a mollic epipedon. Tyee soils have a paralithic contact at a depth of 10 to 20 inches.
DRAINAGE AND PERMEABILITY: Well-drained; slow to very rapid runoff; moderate permeability.
USE AND VEGETATION: These soils are used for grazed woodland, timber production, nonirrigated hay and pasture, watershed, recreation, and wildlife habitat. Native vegetation is Douglas-fir and ponderosa pine with an understory of bluebunch wheatgrass, antelope bitterbrush, pinegrass, rose, arrowleaf balsamroot, Saskatoon serviceberry, white spirea, and common snowberry.
DISTRIBUTION AND EXTENT: North-central Washington; MLRA 6. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Chelan County, Washington, 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon - the zone from 2 to 17 inches
Cambic horizon - the zone from 17 to 44 inches
Vitrandic feature - the zone from 2 to 17 inches
Particle-size control section - the zone from 12 to 42 inches
Classification revised 4/92 from coarse-loamy, mixed, frigid Ultic Haploxerolls to coarse-loamy, mixed, frigid Vitrandic Haploxerolls.
Classification revised 8/01 from coarse-loamy, mixed, frigid Vitrandic Haploxerolls to coarse-loamy, isotic, frigid Vitrandic Haploxerolls.