LOCATION MANORCREEK WAEstablished Series
TAXONOMIC CLASS: Loamy, mixed, dysic, isofrigid Terric Haplosaprists
TYPICAL PEDON: Manorcreek mucky peat-forestland, on a 2 percent slope at an elevation of 380 feet. (When described on September 25, 1997, the soil was moist throughout. Colors are for moist soils unless otherwise stated.
Oi-- 0 to 1 inch peat; slightly decomposed needles, leaves, twigs, and cone fragments; 95 to 100 percent fibers unrubbed, 90 to 95 percent fibers rubbed; very strongly acid (pH 4.6); abrupt smooth boundary. (1/2 to 2 inches thick)
Oe-- 1 to 9 inches; very dusky red (2.5YR 2.5/2) mucky peat (same color whether evaluating a broken face, rubbed, or pressed); 35 percent fibers unrubbed, 20 percent fibers rubbed; dries irreversibly; many very fine, fine, medium, and coarse roots; extremely acid (pH 3.5); abrupt smooth boundary. (6 to 10 inches thick)
Oa1-- 9 to 14 inches; black (7.5YR 2.5/1) muck; (same color whether evaluating a broken face, rubbed, or pressed); 5 percent fibers unrubbed, 1 percent fibers rubbed; very hard; dries irreversibly; few very fine and fine roots; extremely acid (pH 3.7); clear smooth boundary.
Oa2-- 14 to 35 inches; black (10YR 2/1) muck; (same color whether evaluating a broken face, rubbed, or pressed); 5 percent fibers unrubbed, 0 percent fibers rubbed; very hard; dries irreversibly; few very fine roots; extremely acid (pH 4.0); clear smooth boundary. (Combined thickness of the Oa horizons is 18 to 30 inches.)
2C-- 35 to 60 inches; brown (10YR 4/3) silt, light yellowish brown (10YR 6/4) dry; massive; very hard, friable, slightly sticky and slightly plastic; moderately smeary; common fine and medium distinct olive brown (2.5Y 4/3), light gray (2.5Y 7/2) dry irregularly shaped iron depletions with clear boundaries in the matrix; moderately acid (pH 5.8).
TYPE LOCATION: Grays Harbor County, Washington, about 3 3/4 miles northwest of the intersection of State Highway 101 and Forest Service road #21, about 1,795 feet east and 1,160 feet south of the northwest corner of Section 5, T. 23 N., R. 11 W. (Latitude 47 degrees 31 minutes 47 seconds North, Longitude 124 degrees 08 minutes 53 seconds West)
RANGE IN CHARACTERISTICS: The mean annual soil temperature is 43 to 45 degrees F. The mean summer soil temperature is 48 to 50 degrees F and the mean winter soil temperature is 40 to 42 degrees F. The difference between the mean winter and summer soil temperature is 7 to 9 degrees F. These soils are always moist, and have a surplus of available water on a monthly basis throughout the year; peraquic soil moisture regime. Depth to dense or cemented till is greater than 60 inches. Depth to the mineral material is 24 to 36 inches. The surface tier (0 to 20 cm, or 0 to 12 inches) contains fibric, hemic and sapric material with the combination of fibric and hemic material making over 50 percent of the thickness. The subsurface tier (30 to 90 cm, or 12 to 36 inches) contains only sapric material with mineral soil material present at a depth of 24 to 36 inches. The bottom tier (90 to 130 cm, 36 to 52 inches or more) is mineral soil material consisting of silt or silt loam.
The Oe horizon has hue of 2.5YR or 5YR moist and chroma of 1 or 2 moist either broken, rubbed, or pressed. It is ultra acid or extremely acid.
The Oa horizon has hue of 7.5YR, 5YR, or 10YR moist, value of 2 or 2.5 moist, and chroma of 0 or 1 moist either broken, rubbed, or pressed. It is ultra acid or extremely acid.
The 2C horizon has hue of 10YR or 7.5YR moist, value of 3 through 5 moist, and chroma of 2 through 4 moist. It is silt or silt loam and strongly or moderately acid.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Manorcreek soils are in closed wet depressions on till plains. Slopes are 0 to 5 percent. The soils formed in organic material over glaciolacustrine deposits. Elevations are 350 to 500 feet. Average annual precipitation is 110 to 130 inches. Fog drip contributes to the effective precipitation totals. Average annual temperature is 41 to 43 degrees F. The frost-free season is 120 to 140 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Haas, Kunamakst, Salmonriver, and Thimblepeak soils. All of these soils are on ground moraines and are mineral soils.
DRAINAGE AND PERMEABILITY: Very poorly drained; moderate over slow permeability. Manorcreek soils have a perched zone of saturation between 0 and 3.5 feet year round.
USE AND VEGETATION: Timber production, wildlife habitat, recreation, and watershed. Native vegetation is western redcedar, western hemlock, lodgepole pine, cascara buckthorn, salal, deer fern, labrador tea, and common beargrass.
DISTRIBUTION AND EXTENT: Grays Harbor County, Washington MLRA 4A. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Grays Harbor County, Washington, 2007; Quinault Indian Reservation.
REMARKS: Diagnostic horizons and features recognized in this pedon are the following:
Fibric material - 0 to 1 inch (Oi layer)
Hemic material - 1 to 9 inches (Oe layer)
Sapric material - 9 to 35 inches (Oa1 and Oa2 layers)
Terric subgroup - mineral soil material at 35 inches
This soil has a peraquic soil moisture regime.