LOCATION BORGES OREstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, nonacid, mesic Typic Humaquepts
TYPICAL PEDON: Borges silty clay loam - cultivated. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 7 inches; very dark gray (10YR 3/1) silty clay loam, dark gray (10YR 4/1) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine roots; many very fine tubular pores; strongly acid (pH 5.4); clear smooth boundary. (5 to 8 inches thick)
A--7 to 12 inches; very dark grayish brown (10YR 3/2) silty clay loam, dark grayish brown (10YR 4/2) dry; common fine distinct dark yellowish brown (10YR 4/4) mottles; moderate medium subangular blocky structure; slightly hard, friable, sticky and plastic; many very fine roots; many very fine tubular pores; strongly acid (pH 5.4); clear smooth boundary. (3 to 8 inches thick)
Bg--12 to 18 inches; dark grayish brown (10YR 4/2) silty clay loam, grayish brown (10YR 5/2) dry; common fine distinct dark yellowish brown (10YR 4/4) mottles; moderate medium subangular blocky structure; hard, firm, sticky and plastic; common very fine roots; many very fine tubular pores; medium acid (pH 5.8); abrupt smooth boundary. (6 to 12 inches thick)
2Cg1--18 to 24 inches; dark gray (10YR 4/1) silty clay, grayish brown (10YR 5/2) dry; common medium distinct brown (7.5YR 4/4) mottles; massive; very hard, very firm, very sticky and very plastic; common very fine tubular pores; medium acid (pH 6.0); gradual wavy boundary. (5 to 15 inches thick)
2Cg2--24 to 45 inches; dark gray (10YR 4/1) and grayish brown (10YR 5/2) silty clay, grayish brown (2.5Y 5/2) dry; many medium distinct brown (7.5YR 4/4) mottles; massive; very hard, very firm, very sticky, and very plastic; common very fine tubular pores; medium acid (pH 6.0); clear smooth boundary. (10 to 25 inches thick)
2Cg3--45 to 60 inches; brown (10YR 4/3) and grayish brown
(10YR 5/2) clay loam, grayish brown (2.5Y 5/2) dry; many medium distinct brown (7.5YR 4/4) mottles; massive; hard, firm, sticky and plastic; common very fine tubular pores; 15 percent weathered gravel; medium acid (pH 6.0).
TYPE LOCATION: Clackamas County, Oregon; about 1 mile west of West Linn; 100 feet east of Salomo Road in the NW1/4SW1/4SE1/4 section 26, T. 2 S., R. 1 E.
RANGE IN CHARACTERISTICS: The soil is saturated with water during the winter and spring unless artificially drained. Depth to the 2C horizon is 15 to 25 inches. Depth to the bedrock is more than 60 inches. Mean annual soil temperature is 51 to 53 degrees F. The umbric epipedon is 10 to 15 inches thick.
The A horizon has hue of 10YR or 7.5YR, value of 4 or 5 dry, and chroma of 1 or 2 moist and dry. It is medium acid or strongly acid.
The Bg horizon has hue of 10YR or 7.5YR, value of 3 or 4 moist, 4 or 5 dry, and chroma of 1 or 2 moist and dry. It has distinct or prominent mottles and is slightly acid or medium acid.
The 2C horizon has hue of 10YR or 2.5Y, value of 4 through 6 moist, 5 through 7 dry, and chroma of 1 or 2 moist and dry. It is silty clay or clay and averages 45 to 60 percent clay to a depth of 40 inches or more. Below a depth of 40 inches, the texture is clay loam, clay or silty clay with 0 to 35 percent weathered gravel.
COMPETING SERIES: These are the Buckley, Gumboot and Skagit series in other families. Buckley, Gumboot and Skagit soils average less than 35 percent clay in the particle-size control section.
GEOGRAPHIC SETTING: Borges soils are in concave swales and drainageways on rolling uplands and high terraces at elevations of 300 to 650 feet. Slope is 0 to 8 percent. The soils formed in mixed old clayey alluvium. Summers are warm and dry and winters are cool and wet. Mean annual precipitation is 48 to 65 inches, mean annual temperature is 50 to 52 degrees F., and the frost-free period is 140 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bornstedt, Cottrell, Cornelius, and Powell soils. Bornstedt soils have less than 35 percent clay in the particle-size control section. Cornelius and Powell soils have a fragipan at a depth of less than 40 inches. Cottrell soils have chroma of more than 2 throughout the B horizon.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff or ponded; very slow permeability.
USE AND VEGETATION: The soils are used for pasture, hay, woodland, and wildlife habitat. Native vegetation dominantly is red alder, Oregon ash, Douglas-fir, hazel, western redcedar, and western swordfern.
DISTRIBUTION AND EXTENT: High terraces and rolling uplands of the northern Willamette Valley. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clackamas County, Oregon, 1982.