LOCATION BRIDGEWATER WA+ID OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, superactive, mesic Cumulic Haploxerolls
TYPICAL PEDON: Bridgewater extremely stony sandy loam-rangeland on a 2 percent southwest slope at an elevation of 1,330 feet. (Colors for dry soil unless otherwise noted).
A1--0 to 8 inches; dark grayish brown (10YR 4/2) extremely stony sandy loam, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable, nonsticky and nonplastic; many very fine roots; many very fine irregular pores; 30 percent pebbles, 25 percent cobbles and 15 percent stones; neutral (pH 7.0) clear wavy boundary. (6 to 11 inches thick)
A2--8 to 30 inches; dark grayish brown (10YR 4/2) extremely cobbly sandy loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure, soft, very friable, nonsticky and nonplastic; common very fine roots; many very fine irregular pores; 30 percent pebbles, 30 percent cobbles and 10 percent stones; neutral (pH 7.0) clear wavy boundary. (10 to 34 inches thick)
2C--30 to 60 inches; brown (10YR 5/3) extremely cobbly loamy sand, very dark grayish brown (10YR 3/2) moist; single grain; loose; few very fine roots; 30 percent pebbles, 30 percent cobbles and 10 percent stones; neutral (pH 7.0).
TYPE LOCATION: Asotin County, Washington; about 9 miles southwest of Anatone, 1,200 feet south and 2,300 feet west of northwest corner of sec. 5, T. 6 N., R. 44 E.
RANGE IN CHARACTERISTICS: Depth to 2C horizon is 20 to 40 inches. Mean annual soil temperature is 51 to 56 degrees F. These soils are usually moist but are dry in all parts between 4 and 12 inches for 75 to 90 consecutive days following summer solstice. The particle-size control section averages 6 to 15 percent clay in the fine earth fraction and is 60 to 80 percent basalt fragments. The mollic epipedon is 20 to 40 inches thick.
The A1 horizon has value of 3 or 4 dry and chroma of 1 or 2 moist, 2 or 3 dry.
The A2 horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 2 or 3 dry or moist. It is extremely cobbly sandy loam, extremely cobbly loam, extremely cobbly coarse sandy loam, extremely gravelly loam, or extremely gravelly sandy loam. Reaction is slightly acid through slightly alkaline.
The 2C horizon has value of 4 or 5 dry, 2 or 3 moist, and chroma of 1 through 3 dry or moist. It is extremely cobbly coarse sand, extremely cobbly loamy sand, extremely cobbly sand, extremely gravelly coarse loamy sand or extremely gravelly sand. Reaction is slightly acid through slightly alkaline.
COMPETING SERIES: These are the Veazie, Wenaha, and Yakima series in other families. Veazie, Wenaha, and Yakima soils are coarse-loamy over sandy or sandy-skeletal.
GEOGRAPHIC SETTING: Bridgewater soils are on flood plains, low terraces, and alluvial fans at elevations of 750 to 2,500 feet. Slopes are 0 to 15 percent. These soils formed in alluvium. The average annual precipitation ranges from 12 to 22 inches. Average annual air temperature is 50 to 54 degrees F. Frost-free season is 120 to 190 days.
GEOGRAPHICALLY ASSOCIATED SOILS: They are the Gwinly, Joseph, Laufer, and Lickskillet series and the competing Wenaha series. Joseph soils are sandy-skeletal. Gwinly, Laufer, and Lickskillet soils have a lithic contact at a depth of less than 20 inches.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff, moderate or moderately rapid permeability. These soils are subject to rare or occasional flooding.
USE AND VEGETATION: Used for rangeland. Native vegetation is bluebunch wheatgrass, serviceberry, hawthorn, and rose.
DISTRIBUTION AND EXTENT: Southeastern Washington, western Idaho, and northeastern Oregon. The series is of small extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Asotin County, Washington, 1984.
REMARKS: Diagnostic features and horizons recognized in this soil are a mollic epipedon from the surface to 30 inches and an irregular decrease in organic carbon with depth.