LOCATION DALLESPORT WAEstablished Series
TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Typic Haploxerolls
TYPICAL PEDON: Dallesport very cobbly fine sandy loam-pasture, on a 10 percent south-facing slope at an elevation of 320 feet. (Colors are for dry soil unless otherwise noted.)
Ap--0 to 3 inches; brown (10YR 4/3) very cobbly fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine platy structure; soft, very friable, slightly sticky and nonplastic; many very fine and fine roots; common very fine and fine tubular and few fine irregular pores; 15 percent gravel, 20 percent cobbles, and 5 percent stones; neutral (pH 6.6); abrupt smooth boundary. (3 to 5 inches thick)
A--3 to 11 inches; brown (10YR 4/3) cobbly fine sandy loam, very dark grayish brown (10YR 3/2) moist; weak fine subangular blocky structure; soft, very friable, slightly sticky and nonplastic; many very fine, and fine and few medium roots; common very fine and fine tubular and common fine irregular pores; 5 percent gravel and 10 percent cobbles; neutral (pH 7.0); clear wavy boundary. (7 to 11 inches thick)
Bw--11 to 19 inches; dark yellowish brown (10YR 4/4) sandy loam, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and fine roots; common fine tubular and few fine irregular pores; 5 percent gravel; neutral (pH 7.0); clear wavy boundary. (7 to 10 inches thick)
2BC--19 to 24 inches; yellowish brown (10YR 5/4) very gravelly sandy loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic, common very fine and fine and few medium roots; common fine irregular and few fine tubular pores; 45 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (0 to 6 inches thick)
3C1--24 to 45 inches; multicolored extremely gravelly coarse sand; single grain; loose; few fine and medium roots; many fine irregular pores; 60 percent gravel and 15 percent cobbles; neutral (pH 7.2); abrupt smooth boundary. (18 to 22 inches thick)
3C2--45 to 60 inches; multicolored extremely gravelly coarse sand; single grain; loose; many fine irregular pores; 60 percent gravel and 15 percent cobbles; neutral (pH 7.2).
TYPE LOCATION: North of Dallesport airport, Klickitat County, Washington; 1,000 feet south and 700 feet west of the northeast corner of section 22, T. 2 N., R. 13 E.
RANGE IN CHARACTERISTICS: Depth to secondary carbonates is more than 44 inches. The mean annual soil temperature is estimated to range from 51 to 54 degrees F. The soil moisture control section is dry from 90 to 105 days. The mollic epipedon ranges from 10 to 16 inches in thickness. The particle-size control section averages 2 to 8 percent clay and 35 to 60 percent rock fragments.
The Ap and A horizons have hue of 7.5YR or 10YR, value of 2 or 3 moist, 4 or 5 dry and chroma of 2 or 3 moist and dry. Texture is fine sandy loam, very cobbly fine sandy loam, cobbly fine sandy loam, or gravelly fine sandy loam. Some areas have from 1 to 20 percent surface stones.
The Bw or 2Bw horizon has hue of 7.5YR or 10YR, value of 2 to 4 moist, 4 to 6 dry and chroma of 2 to 4 moist or dry. Texture is gravely sandy loam, gravelly fine sandy loam, very gravelly sandy loam, sandy loam or fine sandy loam, with 5 to 40 percent gravel and 0 to 10 percent cobbles. Reaction is neutral or slightly alkaline.
The 2BC horizon has value of 3 or 4 moist, 4 to 6 dry and chroma of 3 or 4 moist or dry. It has 30 to 45 percent gravel, 5 to 10 percent cobbles, and 0 to 3 percent stones. Reaction is neutral or slightly alkaline.
The 3C horizon has value of 5 to 7 moist, 6 to 8 dry and chroma of 1 to 3 moist or dry. Texture is extremely gravelly coarse sand, very cobbly coarse sand, very gravelly coarse sand, or extremely cobbly coarse sand, with 45 to 65 percent gravel, 15 to 35 percent cobbles, and 0 to 10 percent stones. Reaction is neutral to moderately alkaline.
Some pedons have a 3Ck horizon below 44 inches.
COMPETING SERIES: There are no competing series. The Benge, Cheney, Haley, and Winthrop soils are in other families. Benge, Cheney, and Haley soils are in a coarse-loamy over sandy or sandy-skeletal family.
GEOGRAPHIC SETTING: Dallesport soils are on terraces and terrace escarpments at elevations of 150 to 1,200 feet. Slopes are 0 to 60 percent. They formed in eolian deposits overlying old alluvial sand and gravel. Summers are warm and dry, winters are cool and moist. The mean annual precipitation is 10 to 15 inches. The average January temperature is about 30 degrees F. and the average July temperature is about 72 degrees F. The mean annual temperature is 50 to 54 degrees F. The frost-free season is 130 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chard soils. Chard soils are coarse-loamy and are on terraces
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; slow runoff; moderately rapid permeability.
USE AND VEGETATION: These soils are used for livestock grazing, pasture, and irrigated croplands. Some areas are mined for sand and gravel. Native vegetation is lupine, bluebunch wheatgrass, Idaho fescue, Sandberg bluegrass, yarrow, and balsamroot.
DISTRIBUTION AND EXTENT: Southeastern Washington. MLRA 8. This series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Asotin County, Washington 1984.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon the zone from 0 to 11 inches
Cambic horizon the zone from 11 to 24 inches
Particle-size control section the zone from 10 to 40 inches