LOCATION EUCHRE OREstablished Series
TAXONOMIC CLASS: Medial over loamy, ferrihydritic over isotic, acid, isomesic Alic Endoaquands
TYPICAL PEDON: Euchre medial silt loam, logged. (Colors are for moist soil unless otherwise noted.)
A1--0 to 5 inches; black (10YR 2/1) medial silt loam, very dark grayish brown (10YR 3/2) dry; moderate fine and very fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; moderately smeary; many very fine roots; many very fine irregular pores; extremely acid (pH 4.4); clear smooth boundary.
A2--5 to 15 inches; black (10YR 2/1) medial silt loam, dark brown (10YR 3/3) dry; weak fine subangular blocky structure parting to moderate very fine subangular blocky and granular; slightly hard, friable, slightly sticky and slightly plastic; moderately smeary; many very fine roots; many very fine irregular pores; very strongly acid (pH 4.6); clear wavy boundary. (Combined thickness of the A horizon is 14 to 20 inches thick)
2Bw--15 to 25 inches; dark yellowish brown (10YR 4/4) clay loam, light yellowish brown (10YR 6/4) dry; moderate fine and very fine subangular blocky structure; hard, friable, slightly sticky and slightly plastic; common very fine roots; many very fine tubular pores; common dark brown organic coatings on peds and pores; about 10 percent fine and medium concretions; many fine and very fine distinct, strong brown (7.5YR 4/6) masses of iron accumulation and dark grayish brown (10YR 4/2) iron depletions; extremely acid (pH 4.4); clear wavy boundary. (8 to 25 inches thick)
2C1--25 to 32 inches; brown and dark yellowish brown (10YR 4/3, 4/4) fine sandy loam, light yellowish brown and brownish yellow (10YR 6/4, 6/6) dry; massive; slightly hard, very friable, nonsticky and nonplastic; many very fine irregular and tubular pores; about 10 percent medium and coarse concretions; many distinct fine and very fine dark reddish brown (5YR 3/4), and strong brown (7.5YR 4/6) masses of iron accumulation and dark grayish brown (10YR 4/2) iron depletions; very strongly acid (pH 4.6); clear wavy boundary.
2C2--32 to 36 inches; yellowish brown (10YR 5/4) clay loam, very pale brown (10YR 7/4) dry; massive; hard, friable, slightly sticky and slightly plastic; many very fine tubular and irregular pores; many fine and very fine distinct gray and dark gray (10YR 5/1, 4/1) iron depletions and strong brown (7.5YR 4/6) masses of iron accumulation; very strongly acid (pH 4.8); clear wavy boundary. (Combined thickness of the 2C horizon is 9 to 16 inches)
3C--36 to 60 inches; dark brown (7.5YR 3/2, 3/4) sandy loam, brown and strong brown (7.5YR 4/4, 4/6) dry; massive; slightly hard, very friable, nonsticky and nonplastic; many very fine irregular pores; about 5 percent rounded paragravel; strongly acid (pH 5.4).
TYPE LOCATION: Lincoln County, Oregon; about 350 feet east of Highway 229 and about 150 feet south of Huhtala Road, NE1/4 of section 28, T. 9 S., R. 10 W.
RANGE IN CHARACTERISTICS: The soils are usually moist, but have a short dry period of less than 45 days following the summer solstice. The mean annual soil temperature is 48 to 53 degrees F. The difference between mean summer and mean winter soil temperatures is 5 to 9 degrees F. The umbric epipedon ranges from 14 to 20 inches thick. Aquic conditions with redox concentrations, depletions, and/or matrix chroma of 2 or less are at depth of 10 and 20 inches. The texture control section averages less than 35 percent rock fragments above 40 inches.
The A horizon has hue of 7.5YR or 10YR, value of 2 or 3 moist, 3 to 5 dry and chroma of 1 through 3 moist and dry. Estimated clay content is 12 to 25 percent clay. It has 0 to 15 percent rounded gravel. It has an estimated Alox + Feox of 3.0 to 5.0 percent, P-retention of 05 to 100 percent, 15-bar moisture content (dried) of 20 to 35 percent, and a moist bulk density of 0.75 to 0.85 grams/cubic centimeter. Organic matter is 10 to 15 percent.
The 2Bw horizon has hue of 10YR or 2.5Y, value of 4 or 5 moist, 5 or 6 dry and chroma of 2 through 6 moist and dry. Texture is silty clay loam or clay loam. Clay content is from 27 to 35 percent. It has 0 to 15 percent rounded gravel. It has a moist bulk density of 1.2 to 1.3 grams/cubic centimeter. Reaction is extremely acid, very strongly acid or stongly acid.
The 2C horizon has hue of 10YR or 7.5YR, value of 4 or 5 moist, 4 to 7 dry, and chroma of 3 to 8 moist and dry. It is variegated in some pedons. Texture is fine sandy loam, clay loam and in some areas ranges to stratified loam and fine sandy loam. Clay content is 10 to 35 percent. It has 0 to 15 percent rounded gravel.. Reaction is extremely acid, very strongly acid or strongly acid.
The 3C horizon has hue of 7.5YR or 10YR, value of 3 to 5 moist, 4 through 7 dry and chroma of 2 through 6 moist and dry. It is variegated in some pedons. Texture is sandy loam, loamy sand, gravelly loamy sand, or extremely gravelly sandy loam. Clay content is 3 to 10 percent. It has 0 to 35 percent rounded gravel and ranges to 55 percent below a depth of 40 inches, 0 to 15 percent rounded cobbles, and 0 to 15 percent rounded paragravel. Intermittent very weakly to weakly cemented lenses occur in some pedons. Reaction is extremely, very strongly or strongly acid.
COMPETING SERIES: There are no competing soils in this family.
GEOGRAPHIC SETTING: Euchre soils are on stream terraces at elevations of 40 to 800 feet. Slopes are 0 to 7 percent. They formed in alluvium dominated by amorphous material in the surface. The climate is humid, characterized by cool, moist summers with fog and cool, wet winters. The mean annual precipitation is 70 to 100 inches. The mean annual temperature is 49 to 53 degrees F. The frost-free period is 160 to 300 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Logsden, Quillamook, Siletz, and Wolfer soils. Logsden, Quillamook, and Siletz soils are well drained. In addition, Quillamook soils have andic soil properties throughout the particle-size control section. Wolfer soils are somewhat excessively drained and are medial over sandy or sandy-skeletal. Logsden soils have a fine-silty particle-size family class.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; moderately slow over moderate rapid permeability. An apparent water table is at its uppermost depth from November through May.
USE AND VEGETATION: Most areas have been cleared. Primary uses include pasture and wildlife habitat. Native vegetation includes Sitka spruce, western hemlock, red alder, cascara buckthorn, salmonberry, Douglas spirea, red huckleberry, western brackenfern, vine maple, rushes, sedges and grasses. Douglas fir seedlings have been planted in some areas.
DISTRIBUTION AND EXTENT: Stream terraces of the Winkle geomorphic surface in the central and northern Coast Range in Oregon; MLRA 4A. 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 - surface to a depth of 15 inches. (A1 to A2 horizons)
Cambic horizon - from 15 to 25 inches. (2Bw horizon)
Andic feature - from 0 to 15 inches (A1 and A2 horizons) Redox depletions with chroma of 2 or less occur at a depth of 15 to 25 inches from the surface.
Classification revised 10/04 from Typic Melanaquands to Alic Endoaquands. The value and chroma, moist, overlap Melanaquands and Endoaquands, in addition the melanic index is 1.75 to 2.00 based on data collected on similar soils.