LOCATION SAHALIE OREstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Andic Dystrudepts
TYPICAL PEDON: Sahalie stony loam, forested. (Colors are for moist soil unless otherwise noted.)
Oi--0 to 1 inch; slightly decomposed litter of twigs, cones, leaves, etc.; abrupt smooth boundary. (1/2 to 3 inches thick)
Oe--1 to 2 inches; moderately decomposed organic matter; extremely acid (pH 4.4); abrupt wavy boundary. (1/2 to 4 inches thick)
A1--2 to 3 inches; dark reddish brown (5YR 3/2) stony loam, brown (7.5YR 4/3) dry; weak medium granular structure; slightly hard, friable and firm, nonsticky and nonplastic; weakly smeary; numerous fine, medium and large roots; many very fine and fine tubular and irregular pores; 35 percent rounded cobbles, stones and gravel; strongly acid (pH 5.2); abrupt wavy boundary. (0 to 2 inches thick)
A2--3 to 8 inches; dark brown (7.5YR 3/2) stony loam, brown (7.5YR 4/4) dry; weak very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many fine, medium and large roots; many very fine and fine tubular and irregular pores; 35 percent rounded cobbles, stones and gravel; moderately acid (pH 5.6); gradual wavy boundary. (3 to 10 inches thick)
Bw--8 to 17 inches; dark brown (7.5YR 3/4) very stony loam, brown (7.5YR 5/4) dry; weak very fine and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many fine, medium and large roots; many very fine and fine irregular and tubular pores; 60 percent rounded cobbles, stones and gravel; moderately acid (pH 5.7); clear wavy boundary. (6 to 20 inches thick)
C1--17 to 30 inches; dark yellowish brown (10YR 4/4) very stony loam, light yellowish brown (10YR 6/4) dry; massive; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium roots; many very fine and fine irregular pores; 60 percent stones, cobbles, and gravel; moderately acid (pH 5.8); diffuse wavy boundary. (12 to 30 inches thick)
C2--30 to 40 inches; dark yellowish brown (10YR 4/4) very stony loam, light yellowish brown (10YR 6/4) dry; massive; hard and slightly hard, firm and friable, slightly sticky and slightly plastic; few roots; many very fine and fine irregular pores; 60 percent stones; cobbles, and gravel; moderately acid (pH 5.8); abrupt wavy boundary. (6 to 24 inches thick)
C3--40 to 62 inches; similar to above but firm and hard throughout.
TYPE LOCATION: Clackamas County, Oregon; 100 feet east of the junction of Forest Service Road S224 and S28, NW1/4 NW1/4 section 13, T.2S., R.6E., W.M.
RANGE IN CHARACTERISTICS: The soils are usually moist and are dry between depths of 8 and 24 inches for a short period of less than 45 consecutive days after the summer solstice. The mean annual soil temperature ranges from 47 degrees to 52 degrees F. The depth to bedrock dominantly is greater than 60 inches but ranges to 40 inches. Thickness of the solum ranges from 10 to 24 inches. Rock fragments in the texture control section range from 35 to 70 percent. The field estimated clay content is 10 to 18 percent. The solum is estimated to have acid oxalate extractable aluminum plus one half iron of 1.0 to 2.0 percent and less than 2.0 cmol per kg fine earth of 1N KCL extractable aluminum.
The A horizon has hue of 10YR through 5YR, value of 2 or 3 moist and 4 or 5 dry, and chroma of 2 or 3 moist and 3 or 4 dry. The upper part of the A horizon commonly has 5YR hue.
The B horizon has hue of 10YR or 7.5YR, value of 3 or 4 moist, 5 or 6 dry, and chroma of 4 through 6 moist and dry. It has weak or moderate very fine and fine subangular blocky structure.
The C horizon has hue of 10YR or 7.5YR and chroma of 3 or 4 moist and dry. The lower part of the C horizon is firm or very firm.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Sahalie soils are on hillsides in glaciated valleys of the Cascade Mountains at elevations of 1,000 to 3,000 feet. Slopes range from 5 to 80 percent. The soils formed in medium textured glacial till of late Pleistocene origin and weathered primarily from rocks of the Cascade Andesite formation (olivine basalts and olivine-bearing andesites) although weathered material from the Rhododendron formation (tuffs, breccias and agglomerates) and Columbia River basalt formation is present in some areas. The climate is characterized by warm wet winters and hot moist summers. The mean annual precipitation is 80 to 120 inches, falling as rain in the fall and spring, and snow in the winter. Rainfall amounts are relatively low in the summer. The mean January temperature is 34 degrees F. The mean July temperature is 64 degrees F. The mean annual temperature is 45 to 50 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aschoff and Headley soils. Aschoff soils have umbric epipedons. Headly soils are coarse-silty.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: The primary uses are for timber production, recreation and wildlife habitat. Overstory vegetation is Douglas fir, noble fir, silver fir and hemlock. The understory vegetation is dominated by huckleberry, rhododendron and beargrass.
DISTRIBUTION AND EXTENT: Cascade Mountains of northwest Oregon; MLRA 3. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clackamas County, Oregon (Bull Run, Sandy Area), 1976.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Ochric epipedon - from 2 to 8 inches
Cambic horizon - from 8 to 17 inches (Bw horizon)
Andic feature - from 2 to 17 inches having a moist bulk density of 0.85 to 0.95 grams per cubic centimeter and acid oxalate extractable aluminum plus one-half iron of 1.0 to 2.0 percent.
Particle-size control section - from 10 to 40 inches.
ADDITIONAL DATA: Characterization data for one pedon (FS62Ore-045-5 (1-7)) by Oregon State University. (Unpublished)