LOCATION FORDPRAIRIE WA
Established Series
IRD. DRU/EED
07/2017
FORDPRAIRIE SERIES
Landscape--river valleys
Landform--flood plains, alluvial terraces
Slope--0 to 10 percent
Parent material--alluvium
Mean annual precipitation--about 1500 mm
Mean annual air temperature--about 11 degrees C
Depth class--very deep
Drainage class--moderately well drained
Soil moisture regime--xeric
Soil temperature regime--mesic
Soil moisture subclass--aquic
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Fluvaquentic Haploxerolls
TYPICAL PEDON: Fordprairie loam in an area of hayland (When described on August 18, 2014, the soil was dry to a depth of 74 cm and moist below that depth.)
Ap1--0 to 13 cm; loam, dark brown (7.5YR 3/3) moist, brown (10YR 4/3) dry; moderate medium granular structure; slightly hard, friable, slightly sticky and moderately plastic; many very fine roots; many very fine, common fine, and few medium tubular pores and few medium irregular pores; moderately acid (pH 5.6); abrupt smooth boundary
Ap2--13 to 38 cm; loam, dark brown (10YR 3/3) moist, dark yellowish brown (10YR 4/4) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; many very fine, common fine, and few medium tubular pores and few medium irregular pores; moderately acid (pH 5.9); abrupt smooth boundary
Bw--38 to 74 cm; loam, brown (10YR 4/3) moist, brown (10YR 5/3) dry; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few very fine roots; many very fine and few fine to medium tubular pores and few medium irregular pores; moderately acid (pH 6.0); abrupt smooth boundary
Bg1--74 to 87 cm; clay loam, brown (10YR 4/3) moist, brown (10YR 5/3) dry; moderate very fine subangular blocky structure; moderately hard, friable, slightly sticky and moderately plastic; few very fine roots; common very fine and few medium tubular pores and few medium irregular pores; 10 percent medium distinct brown (7.5YR 5/2) iron depletions lining pores and 15 percent medium prominent yellowish red (5YR 4/6) masses of oxidized iron in matrix; moderately acid (pH 6.0); abrupt smooth boundary
Bg2--87 to 140 cm; clay loam, dark grayish brown (10YR 4/2) moist, pale brown (10YR 6/3) dry; moderate very fine subangular blocky structure; moderately hard, friable, slightly sticky and moderately plastic; few very fine roots; few very fine tubular pores; 40 percent medium prominent yellowish red (5YR 4/6) masses of oxidized iron on faces of peds; moderately acid (pH 6.0); clear wavy boundary
Bg3--140 to 150 cm; clay loam, dark grayish brown (10YR 4/2) moist, pale brown (10YR 6/3) dry; weak very fine subangular blocky structure; moderately hard, friable, slightly sticky and moderately plastic; few very fine tubular pores; 25 percent medium prominent yellowish red (5YR 4/6) masses of oxidized iron on faces of peds and 35 percent coarse prominent dark brown (7.5YR 3/4) iron-manganese masses in matrix; moderately acid (pH 6.0)
TYPE LOCATION: Grays Harbor County, Washington, about 3 km south of Porter; about 490 m east and 65 m north of the southwest corner of section 34, T. 17 N., R. 5 W., Willamette Meridian; Malone, Washington, U.S. Geological Survey quadrangle; latitude 46.9106117 degrees north, longitude 123.3001633 degrees west, WGS 84 (coordinates determined with a GPS)
RANGE IN CHARACTERISTICS:
Mean annual soil temperature--10 to 12 degrees C
Soil moisture control section--dry 45 to 60 days following summer solstice
Mollic epipedon thickness--25 to 50 cm
Depth to aquic conditions--50 to 75 cm
Total rock fragment content--0 to 10 percent gravel
Ap horizon
Hue--10YR to 5YR moist, 10YR or 7.5YR dry
Value--2, 2.5, or 3 moist, 3 to 5 dry
Chroma--2 or 3 moist, 2 to 4 dry
Fine-earth texture--loam, silt loam
Clay content--18 to 27 percent
Reaction (pH)--5.1 to 6.5
Combined thickness--25 to 50 cm
Bw horizon
Hue--10YR to 5YR moist, 10YR or 7.5YR dry
Value--4 to 6 dry
Chroma--3 or 4 moist or dry
Fine-earth texture--loam, silt loam, clay loam
Clay content--18 to 35 percent
Reaction (pH)--5.1 to 6.5
Thickness--10 to 50 cm
Bg horizon
Hue--10YR, 7.5YR
Value--3 or 4 moist, 4 to 6 dry
Chroma--2 to 4 moist or dry
Fine-earth texture--clay loam, loam, silt loam
Clay content--18 to 35 percent
Reaction (pH)--5.1 to 6.5
Combined thickness--60 to 100 cm
Bg3 horizon
Hue--10YR, 7.5YR
Value--3 or 4 moist, 4 to 6 dry
Chroma--2 to 4 moist, 3 to 6 dry
Fine-earth texture--clay loam, silt loam, loam, fine sandy loam
Clay content--15 to 35 percent
Reaction (pH)--5.6 to 6.5
COMPETING SERIES:
Diyou--dry 120 to 150 days; reaction of 6.6 to 7.8; aquic conditions between depths of 25 and 50 cm
Mindlebaugh--reaction of 7.4 to greater than 9.0; accumulation of secondary calcium carbonates; aridic moisture regime
Truckee--reaction of 7.9 to greater than 9.0; effervescent throughout
GEOGRAPHIC SETTING:
Elevation--5 to 55 m
Mean annual precipitation--1200 to 1800 mm
Mean annual air temperature--10 to 11 degrees C
Frost-free period--150 to 200 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Eld--no aquic conditions; in slightly convex to linear positions of flood plains and on alluvial terraces
Scatter,
Elma--no aquic conditions; on convex natural levees and alluvial terraces
Rennie--aquic conditions to the soil surface; frequently ponded; in oxbows and backswamps
Roundtree--aquic conditions to the soil surface; frequently ponded; in concave depressions and overflow stream channels
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage class--moderately well drained
Depth to apparent seasonal water table--50 to 100 cm at times in November through April
Flooding--occastional to frequent, brief periods in November through March
Saturated hydraulic conductivity (Ksat)--moderately high or high in A and Bw horizons, low to high in Bg horizon
USE AND VEGETATION:
Use--hay production, livestock grazing, and crop production in cleared areas; wildlife habitat
Native vegetation--Douglas-fir, western redcedar, bigleaf maple, black cottonwood, red alder, salmonberry, common snowberry, red elderberry, vine maple, redosier dogwood, willow, beaked hazelnut, western swordfern
DISTRIBUTION AND EXTENT: Western Washington; MLRA 2; small extent
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Grays Harbor County, Washington; 2017; name from Ford Prairie area in Grays Harbor County, Washington
REMARKS:
Diagnostic horizons and other features in this pedon
*Particle-size control section--zone from 25 to 100 cm
*Mollic epipedon--zone from the surface to a depth of 38 cm
*Cambic horizon--zone from 38 to 150 cm
*Aquic conditions--zone from 74 to 150 cm
*Redoximorphic depletions with chroma of 2 or less--zone from 74 to 150 cm
4/2017--The Fordprairie series was proposed as a result of an update project. The official series description was developed according to SSR01 Technical Note--Content and Format of Official Series Descriptions (revised 12/2015). Further field investigation and laboratory sampling of the flood plains in MLRA 2 is recommended.
National Cooperative Soil Survey
U.S.A.