LOCATION INDIANPASS WAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, isotic, mesic Andic Dystrudepts
TYPICAL PEDON: Indianpass extremely gravelly medial sandy loam-forestland, on a 71 percent southwesterly aspect at an elevation of 1,410 feet in a western hemlock/Oregon-grape-swordfern plant association. (When described on September 19, 1994, the soil was moist throughout. Colors are for moist soil unless otherwise stated.)
Oi--0 to 2 inches; slightly decomposed needles, twigs, leaves, and other wood fragments; abrupt smooth boundary. (1 to 3 inches thick)
Oe--2 to 3 inches; moderately decomposed organic materials; abrupt smooth boundary. (0.5 to 1 inch thick)
A--3 to 6 inches; very dark grayish brown (10YR 3/2) extremely gravelly medial sandy loam, brown (10YR 5/3) dry; weak very fine and fine granular and weak very fine subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; weakly smeary; many very fine and common fine, medium, and coarse roots; many very fine and common fine irregular pores; 50 percent gravel, 10 percent cobbles; moderately acid (pH 5.6); clear smooth boundary. (2 to 5 inches thick)
Bw1--6 to 11 inches; dark yellowish brown (10YR 3/4) extremely cobbly medial loam, light yellowish brown (10YR 6/4) dry; weak very fine and fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; 25 percent gravel, 40 percent cobbles; moderately acid (pH 5.8); clear wavy boundary.
Bw2--11 to 17 inches; dark brown (7.5YR 3/4) extremely cobbly medial loam, light brown (7.5YR 6/4) dry; weak very fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; 30 percent gravel, 35 percent cobbles; moderately acid (pH 5.8); clear wavy boundary. (Combined thickness of the Bw horizon is 8 to 13 inches)
Bw3--17 to 37 inches; dark brown (7.5YR 3/4) extremely stony medial loam, light brown (7.5YR 6/4) dry; weak very fine and fine subangular blocky and weak very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; common very fine, fine, medium, and coarse roots; common very fine and fine tubular and irregular pores; 25 percent gravel, 20 percent cobbles, and 30 percent stones; moderately acid (pH 5.8); clear wavy boundary. (10 to 22 inches thick)
R--37 inches; fractured hard meta sedimentary rock.
TYPE LOCATION: Clallam County, Washington, about 4 1/3 miles northeast of the Klahowya Forest Service Campground, 1,675 feet east and 2,025 feet south of the northwest corner of Section 7, T. 30 N., R. 10 W. (Latitude 48 degrees, 06 minutes, 41 seconds N., Longitude 124 degrees, 02 minutes, 30 seconds W.)
RANGE IN CHARACTERISTICS: Mean annual soil temperature is 47 to 52 degrees F. These soils are usually moist, and are dry 30 to 45 consecutive days in the soil moisture control section. Depth to bedrock is 20 to 40 inches. The solum has moist bulk density of 0.90 to 1.00 g/cc and has acid oxalate extractable aluminum plus one half iron of 1.0 and 2.0 percent. The particle-size control section has 50 to 90 percent rock fragments by volume.
The A horizon has value of 5 or 6 dry and chroma of 2 through 4 moist. It has 4 to 7 percent organic matter.
The Bw horizon has hue of 10YR or 7.5YR moist and dry, value of 3 or 4 moist, and chroma of 4 or 6 moist. It is very cobbly medial loam, extremely cobbly medial loam, extremely gravelly medial loam, very gravelly medial loam, or extremely strong medial loam. It is moderately or slightly acid. It has 10 to 20 percent clay. It has 1 to 6 percent organic matter..
COMPETING SERIES: These are the Aschoff, Damewood, Hava, Hoodview, Ketland, Nicklund, Nordby and Sahalie series. Aschoff and Sahalie soils are over 40 inches deep. Hava and Ketland soils are deep to dense glacial till. Hoodview and Nordby soils are over 60 inches deep. Nicklund soils are 20 to 40 inches to dense glacial till. Damewood soils have an umbric epipedon.
GEOGRAPHIC SETTING: Indianpass soils are on glaciated mountain slopes. Slopes are 15 to 80 percent. The soils formed in colluvium and residuum from sedimentary and metasedimentary rocks. Elevations are 900 to 1,600 feet. Average annual precipitation is 80 to 100 inches. Average annual temperature is 48 to 50 degrees F. The frost-free season is 160 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: This is the competing Ketland soil.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Native vegetation is Douglas-fir, western hemlock, western redcedar, vine maple, salal, Oregon-grape, western swordfern, red huckleberry, and starflower.
DISTRIBUTION AND EXTENT: Clallam County, Washington; MLRA 1. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clallam County, Washington, 2000; Olympic National Forest.
REMARKS: Diagnostic horizons and features recognized in this pedon are the following:
Ochric epipedon
Cambic horizon - 6 to 37 inches
Andic subgroup properties - 3 to 37 inches
Lithic contact - 37 inches
PSCS - 13 to 37 inches
All depths to diagnostic horizons and other features are measured from the top of the first mineral horizon.