LOCATION DULEYLAKE WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquic Argixerolls
TYPICAL PEDON: Duleylake loam-under native grasses on a 3 percent slopes at 2,480 feet elevation. (Colors are for dry soil unless otherwise noted. All textures are apparent field textures)
A1--0 to 5 inches; dark grayish brown (10YR 4/2) loam, very dark brown (10YR 2/2) moist; weak fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, few fine and medium roots; common very fine and fine irregular pores; neutral (pH 7.0); clear smooth boundary. (4 to 6 inches thick)
A2--5 to 17 inches; brown (10YR 4/3) loam, very dark grayish brown (10 YR 3/2) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, few fine roots; common very fine and fine irregular pores; neutral (pH 7.2); clear wavy boundary. (8 to 12 inches thick)
BA1--17 to 23 inches; yellowish brown (10YR 5/4) loam, dark yellowish brown (10YR 3/4) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky, and slightly plastic; common very fine, few fine roots; common very fine and fine irregular and tubular pores; neutral (pH 7.2); clear wavy boundary. (6 to 10 inches thick)
BA2--23 to 31 inches; pale brown (10YR 6/3) sandy loam, dark brown (10YR 4/3) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; common very fine and fine irregular and tubular pores; mildly alkaline (pH 7.6); clear wavy boundary. (0 to 8 inches thick)
Bt--31 to 37 inches; light brownish yellow (10YR 6/4) clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium and coarse subangular blocky structure; hard, firm, sticky and plastic; few very fine and fine roots; common very fine and fine irregular and tubular pores; common thin and moderately thick clay films on faces of peds and in pores; slightly effervescent; moderately alkaline (pH 8.0); abrupt wavy boundary. (6 to 10 inches thick)
Bk--37 to 60 inches; very pale brown (10YR 7/4) silt loam, yellowish brown (10YR 5/4) moist; many medium prominent brownish yellow (10YR 6/8), and common fine distinct light gray (10YR 7/1) mottles, yellowish brown (10YR 5/8) and gray (10YR 5/1) moist; massive; slightly hard, friable, slightly sticky, slightly plastic; few very fine and fine irregular pores; few soft mosses of lime; slightly effervescent; mildly alkaline (pH 7.8).
TYPE LOCATION: Colville Indian Reservation; Okanogan County, Washington; about 11 miles south of the town of Okanogan; 1,320 feet east and 1,575 feet north of the southwest corner of sec. 1, T. 31 N., R. 26 E., W.M.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at a depth of 20 inches ranges from 49 to 51 degrees F. These soils are usually moist but are dry in all parts between depths of 4 and 12 inches for 90 to 105 consecutive days following the summer solstice. The mollic epipedon is 15 to 20 inches thick. The particle-size control section is 25 to 30 percent clay and less than 10 percent coarse fragments. Depth to the seasonal high water table in spring is 2.0 to 3.0 feet. These soils are saturated at 2 to 3 feet for 90 to 120 days in most years. Depth to mottles with chroma of 2 or less is 25 to 40 inches.
The A horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3 dry.
The Bw horizon has value of 5 or 6 dry, 3 or 4 moist, and chroma of 3 or 4 dry or moist. It is loam or sandy loam. Reaction is neutral or mildly alkaline.
The Bt horizon has value of 5 or 6 dry, 4 through 6 moist, and chroma of 4 through 6 dry or moist. It is loam or clay loam. Reaction is mildly alkaline or moderately alkaline.
The Bk horizon has value of 6 or 7 dry, 4 or 5 moist, and chroma of 3 or 4 dry or moist. Mottles range from common fine distinct to many medium prominent. It is silt loam, loam, or sandy loam. Reaction is mildly alkaline or moderately alkaline.
COMPETING SERIES: These are the Nanum and the Shingletown (T) series. Nanum soils are gravelly in the lower part of the particle-size control section. Shingletown soils lack a Bk horizon, and are not effervescent in any part of the particle-size control section.
GEOGRAPHIC SETTING: Duleylake soils are in basins on glacial till plains. These soils formed in alluvium with an admixture of loess. Slopes are 0 to 8 percent. Elevations range from 2,200 to 2,700 feet. The climate is characterized by warm, dry summers, and cool, moist winters. The average annual precipitation is 12 to 15 inches. The mean January temperature is about 25 degrees F, mean July temperature is about 71 degrees F, and the mean annual air temperature is about 48 degrees F. The frost-free season is about 110 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Conconully, Emdent, Haley, Timentwa, and Picard soils. All these soils lack an argillic horizon. In addition, Conconully, Picard, and Timentwa soils are coarse-loamy. Emdent soils are medial. Haley soils are coarse-loamy over sandy or sandy-skeletal.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; moderate permeability in the upper solum and moderate to moderately slow in the lower solum.
USE AND VEGETATION: Principal uses are cropland, hay and pasture, rangeland, and wildlife habitat. Native vegetation is mainly bluebunch wheatgrass, Sandberg bluegrass, needleandthread, basin wildrye, yarrow, and rabbitbrush.
DISTRIBUTION AND EXTENT: Northcentral Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Colville Indian Reservation; Okanogan County, 1987.
REMARKS: Diagnostic horizons and features recognized in this soil are mollic epipedon from the surface to 17 inches, a cambic horizon from 17 inches to 31 inches, and an argillic horizon from 31 to 37 inches.