LOCATION CARROLLS WAEstablished Series
TAXONOMIC CLASS: Mixed, mesic Typic Psammaquents
TYPICAL PEDON: Carrolls sand on a 1 percent slope at an elevation of 20 feet. (Colors are for moist soils unless otherwise stated.)
C1--0 to 7 inches; dark gray (10YR 4/1) sand, light gray (10YR 6/1) dry; single grain; loose; nonsticky and nonplastic; many very fine and fine roots; neutral (pH 6.8); abrupt smooth boundary. (6 to 9 inches thick)
C2--7 to 10 inches; gray (10YR 5/1) very fine sandy loam, light gray (10YR 6/1) dry; common fine distinct mottles of yellowish brown (10YR 5/6), brownish yellow (10YR 6/6) dry; massive; soft, very friable, nonsticky and nonplastic; neutral (pH 6.8); abrupt smooth boundary. (3 to 6 inches thick)
C3--10 to 60 inches; dark grayish brown (10YR 4/2) loamy sand, grayish brown (10YR 5/2) dry; single grain; loose, nonsticky and nonplastic; neutral (pH 6.8).
TYPE LOCATION: Cowlitz County, Washington, about 3 miles south of Castle Rock, 2,280 feet west, 2,380 feet south of the northeast corner sec. 26, T. 9 N., R. 2 W.
RANGE IN CHARACTERISTICS: The particle-size control section averages 0 to 5 percent coarse fragments and 5 to 20 percent volcanic glass, and is slightly acid or neutral throughout.
The C horizons have hues of 10YR or 2.5Y, value of 4 or 5 when moist, 5 or 6 when dry, and chroma of 1 or 2 when moist or dry. Textures are loamy sand, very fine sandy loam, fine sandy loam, or sand with 0 to 10 percent coarse fragments from 10 to 40 inches below the surface.
COMPETING SERIES: These are the Arloval, Conrad, Gothenberg, Heceta, Junius, Stafford, Tryon, Tyre, and Wanser series. All of these soils lack volcanic ash in the particle-size control section. In addition, Wanser soils are calcareous in the particle-size control section.
GEOGRAPHIC SETTING: The Carrolls soils are on low river terraces and bottomlands, and in swale areas along the Cowlitz and Toutle Rivers at elevations of 10 to 100 feet. Carrolls soils formed in sandy dredge materials over mudflow from the May 18, 1980 eruption of Mt. St. Helens. These deposits are more than 5 feet deep. The climate is characterized by warm, dry summers and cool, moist winters. Average annual precipitation is 45 to 60 inches. The average annual temperature is about 50 degrees F. The growing season (28F) is 200 to 240 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cowlitz, Mountsolo, and Panamaker soils. Cowlitz soils are somewhat excessively drained gravelly soils. Panamaker soils are somewhat excessively drained sandy soils. Mountsolo soils are 25 to 35 percent coarse fragments in the particle-size control section.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained, slow runoff, moderately rapid permeability. This soil has a seasonal high water table as high as 1 foot over the surface to 18 inches at times from November to April. It has brief, frequent flooding from October to May.
USE AND VEGETATION: Areas have been revegetated with grass seedings. Natural revegetation is by red alder.
DISTRIBUTION AND EXTENT: Cowlitz County, Washington; along the Cowlitz and Toutle Rivers. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Cowlitz County, Washington, 1989.
REMARKS: Diagnostic horizon and features recognized in this pedon are an ochric epipedon from the surface to 7 inches and a particle-size control section from 10 to 40 inches that is sandy throughout.