LOCATION DEADMANBAY WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Aquultic Haploxeralfs
TYPICAL PEDON: Deadmanbay silt loam, forested, in a gently sloping mountain valley at 80 m elevation. (Colors are for moist soil unless otherwise noted. When described on July 29, 2004 the soil was dry to 41 cm and moist below.)
Oi--0 to 3 cm; slightly decomposed plant material; abrupt wavy boundary.
A--3 to 13 cm; black (10YR 2/1) silt loam, very dark grayish brown (10YR 3/2) dry; strong coarse granular structure; slightly hard, very friable, nonsticky, nonplastic; many very fine and fine, common medium, and few coarse roots; few fine and medium tubular and common medium irregular pores; 10 percent gravel; very strongly acid (pH 5.0); clear wavy boundary. (7 to 20 cm thick)
Bw--13 to 41 cm; dark brown (10YR 3/3) silt loam, dark yellowish brown (10YR 4/4) dry; moderate coarse subangular blocky structure; moderately hard, friable, moderately sticky, moderately plastic; many very fine and fine, common medium, and few coarse roots; few fine and many medium tubular and common medium irregular pores; 10 percent gravel; moderately acid (pH 5.6); abrupt wavy boundary. (15 to 30 cm thick)
Bg--41 to 74 cm; dark yellowish brown (10YR 4/6) loamy coarse sand, yellowish brown (10YR 5/6) dry; massive; moderately hard, friable, nonsticky, nonplastic; few very fine, fine, and medium roots; many very fine interstitial pores; many fine prominent irregular reddish gray (2.5YR 6/1) dry, and reddish gray (2.5YR 5/1) moist, iron depletions in matrix; moderately acid (pH 6.0); clear wavy boundary. (20 to 40 cm thick)
2Btg--74 to 145 cm; dark yellowish brown (10YR 4/6) gravelly silty clay loam, yellowish brown (10YR 5/6) dry; strong medium subangular blocky structure; hard, friable, moderately sticky, moderately plastic; few fine roots and few medium roots; few very fine interstitial pores; many fine prominent irregular reddish gray (2.5YR 5/1) moist, and reddish gray (2.5YR 6/1) dry, iron depletions in matrix; 30 percent gravel; slightly acid (pH 6.4); gradual wavy boundary. (40 to 80 cm thick)
2Cd--145 to 152 cm; dark reddish gray (2.5YR 4/1) silty clay loam, reddish gray (2.5YR 5/1) dry; massive; very hard, firm, moderately sticky, moderately plastic; 10 percent gravel; neutral (pH 7.3).
TYPE LOCATION: San Juan County, Washington, located about 300 m east and 650 m south of the northwest corner of sec. 19, T. 37 N., R 1 W. Willamette Meridian; False Bay, Washington USGS quadrangle; lat. 48 degrees, 40 minutes, 58 N. and long. 122 degrees, 52 minutes, 30 seconds W.
RANGE IN CHARACTERISTICS: Depths to diagnostic horizons and features start from the mineral soil surface.
Mean annual soil temperature - 9 to 10 degrees C.
Moisture control section - dry 60 to 75 days following the summer solstice
Depth to redoximorphic features - 23 to 46 cm
Depth to densic contact - 100 to 150 cm
Particle-size control section:
Clay content - 18 to 35 percent
A horizon
Value - 2 or 3 moist, 3 to 5 dry
Chroma - 2 or 3 moist, 1 or 2 dry
Bw horizon
Value - 3 or 4 moist, 4 or 5 dry
Chroma - 2 or 3 moist, 3 or 4 dry
Texture - SIL or L
Clay content - 12 to 27 percent
Rock fragments - 0 to 15 percent gravel
Bg horizon
Value - 4 or 5 moist, 5 to 7 dry
Chroma - 4 to 6 moist and dry
Texture - LCOS, LS, or SL
Clay content - 1 to 12 percent
Rock fragments - 0 to 35 percent gravel
2Btg horizons
Value - 4 or 5 moist, 5 to 7 dry
Chroma - 4 to 6 moist and dry
Texture - SICL, SIL, or L
Clay content - 18 to 35 percent
Rock fragments - 0 to 30 percent gravel
2Cd horizon
Value - 3 to 5 moist, 4 to 6 dry
Chroma - 2 or 3 moist and dry
Texture - SICL, SIL, or L
Clay content - 12 to 35 percent
Rock fragments - 0 to 15 percent gravel
COMPETING SERIES: These are the Doolyville (T), Killebrew, Mitchellbay, Quatama, and Stockel series. Doolyville, Quatama, and Stockel do not have a densic contact. Killebrew and Mitchellbay soils are on similar landscape positions but have densic contacts above 100 cm. Wellsdale soils do not have redoximorphic features above 50 cm or a densic contact.
GEOGRAPHIC SETTING: Deadmanbay soils are in valleys of drift plains and drainageways of hills and mountains. Slope ranges from 2 to 15 percent. These soils formed in glacial drift underlain by dense glaciomarine deposits. Elevations are 0 to 198 m. The climate is characterized by warm dry summers and mild moist winters. The mean annual precipitation is 635 to 1016 mm. The mean annual temperature is 9 to 10 degrees C. The frost-free period is about 200 to 240 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bazal, Morancreek, and Cady soils. Bazal soils are in depressions within valleys and glacial drift plains and have aquic conditions to the surface and a densic contact at 50 to 100 cm. Morancreek soils are in similar landscape positions but do not have redoximorphic features above 38 cm or a densic contact. Cady soils are on slopes and summits of hills and mountains and have a lithic contact at 25 to 50 cm.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Somewhat poorly drained. Saturated hydraulic conductivity is moderately high to high in the upper part (A and B horizons) and moderately slow to very slow in the lower part (2Btg and 2Cd horizons).
USE AND VEGETATION: Deadmanbay soils are used for timber production, wildlife habitat, forage crop production, and livestock grazing. Potential natural vegetation consists of western redcedar, Douglas-fir, grand fir, lodgepole pine, red alder, common snowberry, trailing blackberry, salmonberry, stinging nettle, salal, swordfern, and bracken fern.
DISTRIBUTION AND EXTENT: Northwest Washington; MLRA A2, Northern Part. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: San Juan County, Washington, 2006.
REMARKS: Diagnostic horizons and other features:
Umbric epipedon - the zone from 3 to 41 cm (A and Bw horizons)
Argillic horizon - 74 to 145 cm (2Btg horizon)
Densic contact - 145 cm (upper boundary of 2Cd horizon)
Particle-size control section - 74 to 124 cm (upper 50 cm of argillic horizon)
Depth to redoximorphic features - 41 cm (iron depletions with a chroma of 2 or less)