LOCATION DAHL OREstablished Series
TAXONOMIC CLASS: Fine, smectitic, mesic Entic Haploxererts
TYPICAL PEDON: Dahl silty clay - on a nearly level slope, rangeland. (Colors are for moist soil unless otherwise noted.)
A--0 to 3 inches; dark gray (10YR 4/1) silty clay, grayish brown (10YR 5/2) dry; strong coarse platy structure; hard, firm, sticky and plastic; many very fine, fine and common medium and coarse roots; many very fine, fine and common medium and coarse irregular pores; neutral (pH 7.0); clear smooth boundary. (3 to 5 inches thick)
Bss1--3 to 20 inches; dark gray (10YR 4/1) silty clay, grayish brown (10YR 5/2) dry; strong coarse prismatic structure; extremely hard, extremely firm, very sticky and very plastic; many very fine, fine and common medium and coarse roots; many very fine, fine and common medium and coarse irregular pores; many intersecting slickensides; neutral (pH 7.0); clear smooth boundary.
Bss2--20 to 27 inches; dark grayish brown (10YR 4/2) clay, brown (10YR 5/3) dry; strong coarse subangular blocky structure; extremely hard, extremely firm, very sticky and very plastic; many very fine, fine and few medium roots; many very fine, fine and few medium tubular pores; many intersecting slickensides; neutral (pH 7.0); clear smooth boundary. (combined thickness of the Bss1 and Bss2 horizons is 20 to 28 inches)
Bss3--27 to 35 inches; brown (10YR 4/3) silty clay loam, pale brown (10YR 6/3) dry; moderate medium subangular blocky structure; hard, very firm, sticky and plastic; common very fine and fine roots; common very fine and fine tubular pores; many intersecting slickensides; neutral (pH 7.2); clear smooth boundary. (6 to 10 inches thick)
2Bw--35 to 45 inches; brown (10YR 5/3) silt loam, very pale brown (10YR 7/3) dry; moderate medium subangular blocky structure; slightly hard, firm, slightly sticky and slightly plastic; few very fine and fine roots; few very fine and fine tubular pores; mildly alkaline (pH 7.4); clear smooth boundary. (10 to 15 inches thick)
3Bkss--45 to 60 inches; brown (10YR 5/3) silty clay loam, pale brown (10YR 6/3) dry; common faint dark yellowish brown (10YR 4/4 mottles); moderate medium subangular blocky structure; hard, firm, sticky and plastic; few very fine and fine roots; few very fine and fine tubular pores; common intersecting slickensides; strongly effervescent with segregated lime in seams; moderately alkaline (pH 7.9)
TYPE LOCATION: Wasco County, Oregon, about 300 feet east and 600 feet south of the NW corner of section 23, T.6 S., R.11 E. (Latitude 45 degrees, 02 minutes, 23 seconds N, Longitude 121 degrees, 23 minutes, 57 seconds W) Warm Springs Indian Reservation.
RANGE OF CHARACTERISTICS: These soils have cracks 5 mm or more wide that open and close each year and remain open for 60 to 90 consecutive days. The mean annual soil temperature is 47 to 51 degrees F. Depth to sedimentary bedrock is greater than 60 inches. Depth to the 3 Bkss horizon is 40 to 55 inches. The particle-size control section averages 35 to 50 percent clay.
The A horizon has value of 3 or 4 moist, 5 or 6 dry and chroma of 1 or 2 moist and dry. It is 40 to 60 percent clay.
The Bss horizon has value of 4 or 5 moist, 5 or 6 dry and chroma of 1 through 3 moist and dry. It has common to many intersecting slickensides. The upper Bss1 and Bss2 horizons are clay or silty clay with 40 to 60 percent clay. The lower Bss3 horizon is silty clay loam with 30 to 40 percent clay.
The 2Bw horizon has value of 5 or 6 moist, 6 or 7 dry and chroma of 3 or 4 moist and dry. It is silt loam or loam with 20 to 27 percent clay.
The 3Bkss horizon has value of 4 or 5 moist, 6 or 7 dry, and chroma of 3 or 4 moist and dry. It is mildly alkaline or moderately alkaline.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Dahl soils are on nearly level basins. The soil formed in mixed alluvium and colluvium derived dominantly from sedimentary rock. Slopes are 0 to 3 percent. Elevations are 2500 to 2700 feet. The climate is characterized by cool and wet winters and hot and dry summers. The mean annual precipitation is 16 to 20 inches. The mean annual temperature is 45 to 49 degrees F. The frost-free period is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bodell and Logsprings soils. Bodell soils are loamy-skeletal, well drained, shallow to sedimentary rock and are on adjacent benches. Logsprings are fine-loamy over clayey and are in concave positions on adjacent benches.
DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is slow. An apparent water table is at a depth of 2 to 3 feet from March to May.
USE AND VEGETATION: These soils are used for livestock grazing and wildlife habitat. The native vegetation is bluegrasses, rush, sedge, and tufted hairgrass.
DISTRIBUTION AND EXTENT: North-central Oregon; MLRA 6. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Wasco County (Warm Springs Indian Reservation), Oregon, 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from 0 to 3 inches (A horizon)
Entic feature - less than 27 percent clay in the zone from 35 to 45 inches ( 2Bw horizon).
Particle-size control section - from 10 to 40 inches (lower 10 inches of Bss1 horizon, Bss2 and Bss3 horizons, and lower 5 inches of 2Bw horizon) with weighted average of 40 percent field estimated clay.
Xeric moisture regime with 60 to 90 dry days.