LOCATION KAWEETA WAEstablished Series
TAXONOMIC CLASS: Medial-skeletal, ferrihydritic, isofrigid Eutric Pachic Fulvudands
TYPICAL PEDON: Kaweeta extremely gravelly medial loam - forestland, on a 62 percent southeasterly aspect at an elevation of 1,280 feet in a Pacific silver fir/salal-deer fern plant association. (When described on January 3, 1995, the soil was moist throughout. Colors are for moist soil unless otherwise stated.)
Oi--0 to 1 inch; slightly decomposed needles, leaves, and twigs; abrupt smooth boundary. (0.5 to 3 inches thick)
A--1 to 7 inches; very dark grayish brown (10YR 3/2) extremely gravelly medial loam, yellowish brown (10YR 5/4) 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 fine and common medium and coarse roots; many very fine and fine tubular and irregular pores; 60 percent gravel; strongly acid (pH 5.4); clear smooth boundary. (4 to 7 inches thick)
Bw1--7 to 15 inches; dark brown (7.5YR 3/4) extremely gravelly medial sandy loam, yellowish brown (10YR 5/6) 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 irregular pores; 60 percent gravel, 5 percent cobbles; moderately acid (pH 5.6); clear wavy boundary.
Bw2--15 to 25 inches; dark brown (7.5YR 3/4) extremely gravelly medial sandy loam, yellowish brown (10YR 5/6) 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, and medium and few coarse roots; common very fine and fine irregular pores; 55 percent gravel, 10 percent cobbles; moderately acid (pH 5.6); clear wavy boundary. (Combined thickness of the Bw horizon is 10 to 22 inches.)
BC--25 to 33 inches; dark yellowish brown (10YR 3/4) extremely gravelly medial sandy loam, yellowish brown (10YR 5/6) 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 and fine and few medium and coarse roots; common very fine and fine irregular pores; 60 percent gravel, 15 percent cobbles; moderately acid (pH 5.8); abrupt wavy boundary. (6 to 11 inches thick)
R--33 inches; hard volcanic breccia.
TYPE LOCATION: Clallam County, Washington, about 1 mile southeast of Ellis Mtn., about 2,330 feet west and 1,275 feet north of the southeast corner of Section 30, T. 31 N., R. 12 W. (Latitude 48 degrees, 09 minutes, 09 seconds N., Longitude 124 degrees, 17 minutes, 34 seconds W.)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 43 to 47 degrees F. The mean summer soil temperature is 47 to 50 degrees F. and the mean winter soil temperature is 40 to 45 degrees F. The difference between the mean summer and mean winter soil temperature is 5 to 9 degrees F. These soils are usually moist, and are dry 0 to 30 consecutive days in the soil moisture control section, udic moisture regime. Depth to bedrock is 20 to 40 inches. The particle-size control section from the mineral soil surface to the bedrock contact has andic soil properties 60 to 90 percent rock fragments by volume. The andic soil material has an estimated moist bulk density of 0.30 to 0.70 g/cc, acid-oxalate extractable aluminum plus one half of the acid-oxalate extractable iron of 2 to 6 percent, phosphate retention of 85 to 100 percent, 15-bar water retention of 30 to 50 percent for air dried samples, acid oxalate iron is 1.5 to 3.5 percent.
The A horizon has hue of 10YR or 7.5YR moist and dry, value of 4 or 5 dry, and chroma of 2 through 4 moist and 4 or 6 dry. Reaction is strongly or moderately acid. It has 20 to 40 percent organic matter. It has 2 to 3 cmol/kg of aluminum.
The Bw horizon has hue of 10YR or 7.5YR moist and dry, value of 3 or 4 moist and 5 or 6 dry, and chroma of 3, 4, or 6 moist and 4 or 6 dry. It is extremely gravelly medial sandy loam, extremely gravelly medial loam, or extremely cobbly medial sandy loam. It has 10 to 20 percent organic matter. It has 1 to 2 cmol/kg of aluminum.
The BC horizon has value of 3 or 4 moist and 5 or 6 dry and chroma of 4 or 6 moist. It is extremely gravelly medial sandy loam or extremely cobbly medial sandy loam.
COMPETING SERIES: This is the Adwell series. Adwell soils are deep to dense glacial till, are perudic and moderately well drained.
GEOGRAPHIC SETTING: Kaweeta soils are on glaciated mountain slopes. Slopes are 40 to 80 percent. The soils formed in colluvium and residuum from marine basalt and associated volcanic rocks. Elevations are 800 to 2,400 feet. Average annual precipitation is 95 to 120 inches. Average annual temperature is 41 to 43 degrees F. The frost-free season is 130 to 150 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Adwell, Eatoncreek, Lizardlake, Neah, Pysht, Urboden, and Zenobia soils. Adwell soils are on moderate relief and glaciated mountain slopes and glacial moraines and are moderately well drained. Eatoncreek and Lizardlake soils are on glaciated mountain slopes and are shallow. Neah soils are on moderate relief mountain slopes and have a medial particle-size control section. Pysht soils are on glaciated mountain slopes and glacial moraines and are moderately well drained. Urboden soils are on mountain headwalls and are very deep. Zenobia soils are on moderate relief and glaciated mountain slopes and mountain headwalls and have over 2 cmol/kg of aluminum in the subsoil.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Native vegetation is Pacific silver fir, western hemlock, western redcedar, salal, salmonberry, red huckleberry, deer fern, and western swordfern.
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 - 7 to 33 inches (Bw1, Bw2 and BC subhorizons)
Andic soil properties - 1 to 31 inches (A, Bw1, Bw2, and BC subhorizons)
Lithic contact - 33 inches
PSCS - 1 to 33 inches (A, Bw1, Bw2, and BC subhorizons)
All depths to diagnostic horizons and other features are measured from the top of the first mineral horizon.