LOCATION WADECREEK OREstablished Series
TAXONOMIC CLASS: Fine, isotic, isomesic Oxyaquic Haplohumults
TYPICAL PEDON: Wadecreek silt loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 2 inches; mat of decomposing needles, leaves, twigs, and moss.
A1--2 to 6 inches; dark reddish brown (5YR 2/2) silt loam, dark brown (7.5YR 3/3) dry; moderate fine and medium granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many fine and very fine roots; many very fine irregular pores; strongly acid (pH 5.4); clear wavy boundary. (3 to 5 inches thick)
A2--6 to 11 inches; dark brown (7.5YR 3/2) silt loam, brown (7.5YR 4/3) dry; moderate fine subangular blocky and granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine and very fine roots; many very fine tubular and many very fine irregular pores; strongly acid (pH 5.4); clear wavy boundary. (3 to 7 inches thick)
BA--11 to 21 inches; dark brown (7.5YR 3/3) silty clay loam, brown (7.5YR 5/3) dry; moderate fine and very fine subangular blocky structure; slightly hard, friable, sticky and plastic; common very fine roots; many very fine tubular pores; strongly acid (pH 5.4); clear smooth boundary. (4 to 10 inches thick)
Bt1--21 to 32 inches; dark yellowish brown (10YR 4/4) silty clay loam, yellowish brown (10YR 5/4) dry; moderate fine subangular blocky structure; hard, firm, very sticky and very plastic; common very fine roots; many very fine tubular pores; few faint clay films on peds; 5 percent rounded gravel in lower part; very strongly acid (pH 4.6); clear smooth boundary. (10 to 15 inches thick)
Bt2--32 to 40 inches; yellowish brown (10YR 5/4) and grayish brown (10YR 5/2) silty clay loam, light yellowish brown (10YR 6/4) and pale brown (10YR 6/3) dry; moderate medium and fine subangular blocky structure; hard, firm, very sticky and very plastic; few very fine roots; many very fine tubular pores; few faint clay films on peds; very strongly acid (pH 4.6); clear smooth boundary. (0 to 10 inches thick)
Bt3--40 to 50 inches; yellowish brown (10YR 5/6) silty clay, brownish yellow (10YR 6/6) dry; moderate medium and fine subangular blocky structure; very hard, very firm, very sticky and very plastic; few very fine roots; common very fine tubular pores; many fine and very fine distinct light yellowish brown (10YR 6/4) masses of iron accumulation and light gray iron depletions (10YR 7/2); common faint clay films on peds; very strongly acid (pH 4.6); abrupt smooth boundary. (8 to 20 inches thick)
BC--50 to 57 inches; yellowish brown (10YR 5/6) and strong brown (7.5YR 4/6) silty clay loam, brownish yellow (10YR 6/6) and strong brown (7.5YR 5/8) dry; weak fine subangular blocky structure; slightly hard, firm, sticky and plastic; common very fine tubular pores; many distinct fine and very fine yellowish red (5YR 4/6) masses of iron accumulation; extremely acid (pH 4.4); clear smooth boundary. (5 to 15 inches thick)
2C--57 to 60 inches; yellowish brown (10YR 5/4) and light gray (10YR 7/2) loam, brownish yellow (10YR 6/6) and very pale brown (10YR 8/3) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; many very fine tubular pores; many fine distinct strong brown (7.5YR 5/6) masses of iron accumulation; extremely acid (pH 4.4).
TYPE LOCATION: Lincoln County, Oregon; about 2,200 feet east and 700 feet south of NW corner of section 5, T. 9 S., R. 10 W.
RANGE IN CHARACTERISTICS: The soil is usually moist; it is dry less than 45 consecutive days between the depths of 4 and 12 inches following the summer solstice. The mean annual soil temperature is 47 to 54 degrees F. The difference between mean summer and mean winter soil temperature is 5 to 9 degrees F. The umbric epipedon is 10 to 20 inches. It is extremely acid through strongly acid throughout the profile. The solum is 40 to 60 inches thick. Clay decreases by 20 percent or more from the maximum between the surface and 60 inches.
The A and BA horizons have hue of 10YR, 7.5YR or 5YR, value of 2 or 3 moist, 3 to 5 dry and chroma of 1 through 3 moist and dry. Clay content is 18 to 35 percent. It has 7 to 10 percent organic matter.
The Bt horizon has hue of 10YR or 7.5YR, value of 3 through 5 moist, 5 or 6 dry and chroma of 2 through 6 moist and dry. Redox features only occur in the lower part of the argillic horizon. It is silty clay or silty clay loam with 35 to 50 percent clay and 0 to 15 percent gravel.
The BC and 2C horizon have hue of 10YR or 7.5YR, value of 4 through 7 moist, 6 through 8 dry and chroma of 2 through 8 moist and dry. It is loam, clay loam or silty clay loam with 15 to 35 percent clay and 0 to 15 percent gravel. Redox concentrations occur throughout this horizon.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Wadecreek soils are on high terrace remnants along major coastal stream systems. Slopes are 0 to 20 percent. Elevation is 200 to 500 feet. The climate is characterized by cool wet winters and cool moist summers with fog. The soils formed in mixed fine textured alluvium. The mean annual precipitation is 70 to 100 inches. The mean annual temperature is 48 to 53 degrees F. The frost-free period is 160 to 300 days.
GEOGRAPHICALLY ASSOCIATED SOILS: There are the Hebo, Fendall, Reedsport, and Tolovana soils. All of the above soils lack argillic horizons. Hebo soils are poorly drained. Fendall and Reedsport soils are well drained and are 20 to 40 inches deep to bedrock. Tolovana soils are well drained and are dominated by amorphous material. Fendall, Reedsport, and Tolovana soils are on adjacent mountain areas or on dissected sideslopes of terrace remnants.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow permeability. A high water table is at a depth of 2 to 3 feet from the soil surface from November through May.
USE AND VEGETATION: These soils are primarily used for timber production, pasture, watershed, and wildlife habitat. Native vegetation includes Douglas fir, western hemlock, Sitka spruce, red alder, cascara buckthorn, vine maple, salmonberry, red huckleberry, salal, and western swordfern. In Curry County, Oregon, native vegetation also includes Port-Orford cedar, evergreen huckleberry, and Pacific rhododendron.
DISTRIBUTION AND EXTENT: Eola age terraces along major stream systems of coastal Oregon; MLRA 1. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Lincoln County, Oregon, 1990.
REMARKS: Diagnostic horizons and features in this pedon:
Umbric epipedon - from 2 to 21 inches. (A1, A2, BA)
Argillic horizon - from 21 to 50 inches (Bt1, Bt2, and Bt3 horizons).
Particle-size control section - from 21 to 41 inches.
All diagnostic horizons and features are measured from the top of the first mineral horizon.