LOCATION WOLLENT OREstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, nonacid, mesic Typic Humaquepts
TYPICAL PEDON: Wollent silt loam, cultivated. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 10 inches; very dark grayish brown (10YR 3/2) silt loam, grayish brown (10YR 5/2) dry; few fine faint dark grayish brown (10YR 4/2) mottles; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine irregular pores; moderately acid (pH 6.0); clear smooth boundary. (10 to 14 inches thick)
Bg--10 to 16 inches; gray (10YR 5/1) silt loam, light gray (10YR 7/1) dry; few fine prominent strong brown (7.5YR 5/6) mottles; weak coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine irregular pores; moderately acid (pH 5.8); clear smooth boundary. (6 to 10 inches thick)
Bcg--16 to 24 inches; gray (10YR 5/1) silt loam, light gray (10YR 7/1) dry; many fine and medium distinct and prominent brown (10YR 4/3) and reddish brown (5YR 4/4) mottles; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; common very fine pores; 25 percent 5 to 30 mm firm and brittle red and black concretions; moderately acid (pH 5.8); clear smooth boundary. (6 to 15 inches thick)
Cg--24 to 60 inches; gray (10YR 5/1) silty clay loam, light gray (10YR 7/1) dry; many fine and medium distinct and prominent brown (10YR 4/3) and reddish brown (5YR 4/4) redox concentrations; massive; hard, friable, moderately sticky and moderately plastic; few very fine irregular pores; moderately acid (pH 5.8).
TYPE LOCATION: Multnomah County, Oregon; about 500 yards northeast of the Multnomah Kennel Club; NW1/4 NE1/4 NW1/4 section 34, T. 1 N., R. 3 E., W.M.
RANGE IN CHARACTERISTICS: The mean annual soil temperature ranges from 52 to 54 degrees F. These soils have a seasonally perched water table at or within 10 inches of the surface. The solum ranges from 20 to 36 inches thick. The particle-size control section is silt loam or silty clay loam and averages about 20 to 30 percent clay. Depth to bedrock is more than 5 feet.
The A horizon has value of 2 or 3 moist, 4 or 5 dry, and chroma of 1 to 2 moist and dry. Redox features are none to common and faint to distinct.
The B horizon has value of 4 or 5 moist, 6 or 7 dry, and chroma of 1 or 2 moist and dry. Redox features are distinct or prominent.
The C horizon commonly is silty clay loam but is stratified with sand or clay in some pedons.
COMPETING SERIES: These are the Buckley, Gumboot and Skagit series in other families. All of these soils are fine-loamy and have more than 15 percent coarser than very fine sand.
GEOGRAPHIC SETTING: The Wollent soils are on high terraces at elevations of 200 to 400 feet. Slopes range from 0 to 3 percent. The soils formed in silty alluvium from the Gresham geologic formation. The climate is subhumid with cool moist winters and warm dry summers. Average January temperature is 35 degrees F., average July temperature is 68 degrees F., and mean annual temperature is 52 to 54 degrees F. Mean annual rainfall is 50 to 60 inches. The frost-free season is 165 to 210 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aloha, Latourell, Multnomah and Powell soils. Aloha soils are somewhat poorly drained. Latourell soils are well drained and have argillic horizons. Multnomah soils are well drained and are fine-loamy over sandy or sandy-skeletal. Powell soils are somewhat poorly drained and have a fragipan.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; moderately slow permeability.
USE AND VEGETATION: Most of these soils are cultivated. Berries, truck crops, nursery stock, hay and pasture are the major crops. Native vegetation is western redcedar, Oregon white oak, bigleaf maple, common snowberry, willow, rose, brackenfern, sedges, grasses and forbs.
DISTRIBUTION AND EXTENT: Along the lower Sandy River in northwestern Oregon. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Multnomah County, Oregon, 1977.
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