LOCATION SEDROWOOLLEY WAEstablished Series
TAXONOMIC CLASS: Coarse-silty, isotic, nonacid, mesic Vitrandic Xerofluvents
TYPICAL PEDON: Sedrowoolley silt loam, cultivated. (Colors are for moist soil unless otherwise indicated. All textures are apparent field textures.)
Ap1--0 to 4 inches; very dark grayish brown (2.5Y 3/2) silt loam, grayish brown (2.5Y 5/2) dry; moderate medium subangular blocky structure and moderate medium and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine continuous tubular pores; slightly acid (pH 6.2) abrupt smooth boundary.
Ap2--4 to 10 inches; dark grayish brown (2.5Y 4/2) silt loam, light brownish gray (2.5Y 6/2) dry; weak coarse subangular blocky structure parting to moderate medium and coarse granular; slightly hard, very friable, slightly sticky and slightly plastic; common very fine and few fine roots; common very fine continuous tubular pores; slightly acid (pH 6.4); clear wavy boundary. (combined thickness of the Ap horizon is 9 to 14 inches).
C1--10 to 16 inches; olive brown (2.5Y 4/4) silt loam, light brownish gray (2.5Y 6/2) dry; few fine very dark grayish brown (10YR 3/2) stains; massive; soft, very friable, slightly sticky and slightly plastic; common very fine roots; common very fine and fine tubular pores; neutral (pH 6.6); abrupt smooth boundary. (4 to 10 inches thick)
C2--16 to 32 inches; dark grayish brown (2.5Y 4/2) very fine sandy loam, light brownish gray (2.5Y 6/2) dry; few fine distinct dark yellowish brown (10YR 4/6) mottles; massive; soft, very friable, slightly sticky and nonplastic; few very fine and fine roots; common very fine and fine continuous tubular and irregular pores; distinct fine (5-30 mm thick) stratification of silt loam, fine sand and very fine sandy loam; a 1-inch layer of organic material at 31 inches; slightly acid (pH 6.4); abrupt smooth boundary. (10 to 20 inches thick)
C3--32 to 40 inches; grayish brown (2.5Y 5/2) silt loam, light brownish gray (2.5Y 6/2) dry; common fine gray (5Y 5/1) mottles; massive; soft, very friable, slightly sticky and nonplastic; few very fine roots; fir, western redcedar, western hemlock and red alder with an understory of western swordfern, ladyfern, geranium, western brackenfern, trailing blackberry, Oregon-grape, and salal.
C4--40 to 60 inches; olive brown (2.5Y 4/4) very fine sandy loam, light gray (2.5Y 7/2) dry; common fine distinct gray (5Y 5/1) mottles; massive; soft, very friable, slightly sticky and nonplastic; neutral (pH 6.6)
TYPE LOCATION: Skagit Count7y, Washington; about 1 mile northwest of Clear lake; 1,300 feet west and 650 feet south of the northeast corner sec. 2, T. 34 N., R. 4 E.
RANGE IN CHARACTERISTICS: These soils are usually moist but are dry in all parts of the moisture control section for 45 to 60 consecutive days following summer solstice. The mean annual soil temperature at a depth of 20 inches ranges from 49 to 53 degrees F. The particle-size control section averages 4 to 18 percent clay and less than 15 percent fine sand or coarser. Mottles with chroma of 2 or less are within 30 inches of the surface. Reaction is slightly acid or neutral throughout.
The Ap horizon has hue of 10YR or 2.5Y, value of 3 or 4 moist, 5, 6 or 7 dry, and chroma of 2, 3, or 4 moist and dry.
The C horizon has hue of 10YR or 2.5Y, value of 4 or 5 moist, 6 or 7 dry, and chroma of 2, 3 or 4 moist, 2 or 3 dry. Textures are silt loam, very fine sandy loam with some strata of fine sandy loam, or fine sand less than 5 inches thick.
GEOGRAPHIC SETTING: Sedrowoolley soils are on alluvial terraces at elevations of 10 to 50 feet. Slopes are 0 to 3 percent. They formed in alluvium. These soils are in a cool marine climate with mild wet winters and cool dry summers. The average annual rainfall ranges from 25 to 45 inches. The average annual temperature is about 51 degrees F., and the frost-free season is 160 to 210 days.
COMPETING SERIES: These are the Cokedale and Clato soils in other families. Cokedale soils are coarse-silty over sandy or sandy-skeletal. Clato soils lack grayish mottles above a depth of 30 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Field, Mt. Vernon, Skagit, and Sumas soils. Field soils are medial over sandy or sandy- skeletal. Mt. Vernon soils are medial over loamy and have a mollic epipedon. Skagit and Sumas soils have an aquic moisture regime. In addition, Sumas soils are fine-silty over sandy or sandy-skeletal.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff and moderate permeability. High water table is at a depth of 3 to 5 feet from November to May. These soils are subject to occasional flooding unless protected.
USE AND VEGETATION: Sedrowoolley soils are used for row crops, hay and pasture. native vegetation is Douglas-fir, western redcedar, western hemlock and red alder with an understory of western swordfern, ladyfern, geranium, western brackenfern, trailing blackberry, Oregon-grape, and salal.
DISTRIBUTION AND EXTENT: Northwestern Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Skagit County, Washington 1980.
REMARKS: Classification only changed 4/94 because of recent amendments to Soil Taxonomy.