LOCATION CLEVESCOVE OR

Established Series
REV. SLR/TDT
06/2011

CLEVESCOVE SERIES

The Clevescove series consists of deep, well drained soils that formed in residuum and colluvium from sandstone. Clevescove soils are on mountains side slopes and have slopes of 30 to 70 percent. The mean annual precipitation is about 75 inches, and the mean annual temperature is about 52 degrees F.

TAXONOMIC CLASS: Coarse-loamy, isotic, isomesic Andic Humudepts

TYPICAL PEDON: Clevescove loam - forested, on a 51 percent slope at an elevation of 260 feet. (Colors are for moist soil unless otherwise stated.)

Oi--0 to 3 inches; slightly decomposed litter of bark, needles and twigs.

A1---3 to 7 inches; black (10YR 2/1) loam, dark gray (10YR 4/1) dry; strong fine and medium granular structure; soft, very friable, slightly sticky and nonplastic; many fine and medium, and common coarse roots; many very fine and fine tubular and irregular pores; 10 percent sandstone gravel; very strongly acid (pH 5.0); clear smooth boundary.

A2--7 to 18 inches; very dark brown (10YR 2/2) loam, brown (10YR 4/3) dry; moderate very fine and fine granular structure; soft, very friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine, fine, and medium tubular and irregular pores; 14 percent sandstone gravel; very strongly acid (pH 5.0); gradual smooth boundary. (Combined thickness of the A horizon is 12 to 20 inches)

AB--18 to 34 inches; very dark brown (10YR 2/2) gravelly loam, dark grayish brown (10YR 4/2) dry; weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine and fine, and common medium tubular pores; 20 percent sandstone gravel; very strongly acid (pH 5.0); gradual smooth boundary. (8 to 17 inches thick)

Bw--34 to 53 inches; very dark grayish brown (10YR 3/2) gravelly loam, grayish brown (10YR 5/2) dry; weak medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine and fine irregular pores; 15 percent hard sandstone gravel, 10 percent parafragments; very strongly acid (pH 5.0); abrupt smooth boundary. (10 to 23 inches thick)

Cr--53 to 63 inches; weathered and fractured sandstone.

TYPE LOCATION: Douglas County, Oregon, about 1 3/4 miles east of Elbow Lake Campground, about 2,500 feet west and 1,000 feet south of the N.E. c.rner of section 34, T. 20 S., R. 12 W. (Latitude 43 degrees, 47 minutes, 41 seconds N, Longitude 124 degrees, 6 minutes, 45 seconds W.)

RANGE IN CHARACTERISTICS: The mean annual soil temperature is 52 to 54 degrees F. The difference between mean summer and mean winter soil temperature varies from 5 to 9 degrees F. The soil is usually moist but is dry within the moisture control section for less than 45 consecutive days following the summer solstice. Depth to paralithic bedrock is 40 to 60 inches. The particle-size control section averages 10 to 18 percent clay. The O horizon is 1 to 4 inches thick. The umbric epipedon is 20 to 35 inches thick. Base saturation is less than 50 percent throughout.

The A horizon has value of 2 or 3 moist, 3 to 5 dry, and chroma of 1 or 2 moist and 1 to 3 dry. It has 10 to 18 percent clay. It has 0 to 15 percent gravel. It is strongly acid to extremely acid. It has 5 to 10 percent organic matter. Bulk density is 0.90 to 1.00 grams/cubic centimeter.

The AB horizon has value of 2 or 3 moist, 3 to 5 dry, and chroma of 2 or 3 moist and dry. It is gravelly loam or loam with 5 to 25 percent gravel. It is strongly or very strongly acid. It has 1 to 5 percent organic matter.

The Bw horizon has value of 2 to 4 moist, 3 to 5 dry, and chroma of 2 to 4 moist and dry. It is gravelly loam, gravelly sandy loam, or sandy loam. It has 7 to 18 percent clay. It has 10 to 35 percent gravel. It is strong or very strongly acid. It has 0.5 to 1.0 percent organic matter.

COMPETING SERIES: This is the Horseprairie series. Horseprairie soils are greater than 60 inches to bedrock, are on marine terraces with slopes of 0 to 30 percent and are silt loam or loam throughout.

GEOGRAPHIC SETTING: Clevescove soils are on mountain side slopes. The soils are formed in residuum and colluvium from sandstone. Slopes are 30 to 70 percent. Elevations are 20 to 800 feet. The climate is characterized by cool, wet winters and cool, moist summers. The mean annual precipitation is 70 to 80 inches. The mean annual temperature is 51 to 53 degrees. The mean January temperature is 42 to 46 degrees F., and the mean July temperature is 58 to 62 degrees F. The frost free period is 180 to 240 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Millicoma, Reedsport, Salander, and Templeton soils. Millicoma and Reedsport soils are 20 to 40 inches to bedrock. In addition, Millicoma soils are loamy-skeletal. These soils are on convex and more steeply sloping side slopes. Salander soils are medial and are on concave and less steeply sloping side slopes. Templeton soils are fine-silty, and are on similar positions.

DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.

USE AND VEGETATION: These soils are used for timber production and wildlife habitat. Native vegetation dominantly is Sitka spruce, western hemlock, western redcedar, Douglas-fir, red alder, salmonberry, red and evergreen huckleberry, western swordfern, Oregon oxalis, vine maple, and salal.

DISTRIBUTION AND EXTENT: Coast Range in southwestern Oregon, MLRA 4A. The series is of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Douglas County, Oregon, 1994.

REMARKS: Diagnostic horizons and features recognized in this pedon are:

Umbric epipedon - from the mineral soil surface to 34 inches. (A1, A2, and AB horizons)

Cambic horizon - from 34 to 53 inches (Bw horizon); mollic colors are present, but organic matter is less than 1 percent.

Particle-size control section - from 13 to 43 inches

Base saturation is assumed to be less than 50 percent.

Organic carbon is assumed to be greater than 12 kg per square meter to a depth of 100 cm.

ADDITIONAL DATA: Laboratory data is available for the Salander and Templeton series, soils that are geographically associated with the Clevescove series. Reference sample SA-1981 Salander soil (Badayos thesis samples), Douglas County, Oregon; Oregon Soil Characterization Laboratory, Oregon State University, Corvallis, Oregon, unpublished.

National Cooperative Soil Survey
U.S.A.