LOCATION DOLLAR WAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, superactive, mesic Humic Fragixerepts
TYPICAL PEDON: Dollar loam - pasture. (Colors are for moist soils unless otherwise stated.)
Ap--0 to 6 inches; dark brown (10YR 3/3) loam, dark grayish brown (10YR 4/2) dry; moderate very fine and fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many fine roots; many shot up to 1/8 inch in diameter; strongly acid; abrupt smooth boundary. (2 to 8 inches thick)
BA--6 to 24 inches; dark reddish brown (5YR 3/3) loam, reddish brown (5YR 4/3) dry; moderate fine subangular blocky structure; hard, friable, slightly sticky and moderately plastic; 2 common fine roots; many fine pores; very few shot; very strongly acid; clear wavy boundary. (12 to 20 inches thick)
Bw--24 to 32 inches; dark brown (7.5YR 3/4) loam, brown (7.5YR 5/4) dry; weak medium subangular blocky structure; hard, friable, slightly sticky and moderately plastic; few very fine roots; few very fine pores; a number of peds are prominent nodule-like, rounded, and oblong, 1x2 inches in size, and brittle; strongly acid; clear smooth boundary. (6 to 14 inches thick)
Bx1--32 to 45 inches; dark yellowish brown (10YR 3/4) loam, yellowish brown (10YR 5/4) dry; many medium distinct mottles, grayish brown (10YR 5/2) moist; very coarse polygonal blocks, larger than 10 inches; very hard, very firm (brittle), slightly sticky and moderately plastic; few very fine pores; strongly acid; gradual smooth boundary. (6 to 15 inches thick)
Bx2--45 to 60 inches; similar to above except that this horizon becomes less brittle and compact with increase in depth; loam; slightly plastic; very strongly acid.
TYPE LOCATION: Clark County, Washington; one-half mile north of Meadow Glade, Washington; 140 feet west of intersection of northeast 119th Street and northeast 112th Avenue on 199th Street; in the SE1/4, SE1/4, SE1/4 of section 4, T. 3 N., R. 2 E., W.M.
RANGE IN CHARACTERISTICS: The mean annual soil temperature at a depth of 20 inches ranges from 47 degrees to 52 degrees F. The solum ranges from moderately acid to very strongly acid. Depth to the fragipan is 20 to 40 inches. The umbric epipedon is 14 to 30 inches thick.
The A horizon is very dark brown to dark brown.
The BA horizon has hue of 5YR through 10YR, value of 2 or 3, and moist chroma of 2 or 3.
The Bw horizon has hue of 5YR through 10YR, moist value of 2 through 4, and moist chroma of 2 through 6. Depth to the fragipan ranges from 24 to 42 inches.
The Bx horizons have hue of 5YR through 10YR, moist value of 3 or 4, and moist chroma of 3 through 6. Depth to mottles with moist chroma of 2 or less exceeds 30 inches. The 10- to 32-inch control section is dominantly loam with more than 18 percent clay and more than 15 percent particles coarser than very fine sand.
COMPETING SERIES: These are the Baumgard and Lebar series. Baumgard and Lebar soils lack fragipans.
GEOGRAPHIC SETTING: These soils are on terraces at elevations of 250 to 300 feet. Slopes are 0 to 5 percent. These soils formed in mixed old alluvium. Dollar soils are in a humid marine climate having relatively cool dry summers and mild moist winters. Average annual precipitation is about 50 inches. Average January temperature is 37 degrees F., average July temperature is 64 degrees F., mean annual temperature is 50 degrees F., and the growing season is about 132 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cove, Hillsboro, and Hockinson soils. Hillsboro and Hockinson soils have less than 18 percent clay. Cove soils have more than 35 percent clay.
DRAINAGE AND PERMEABILITY: Moderately well drained; slow runoff; moderate permeability in the A and upper B horizons and very slowly permeable in the Bx horizon.
USE AND VEGETATION: Mainly for production of hay, pasture, and small grains. Native vegetation is Douglas-fir, red alder, grand fir, and western redcedar, with an understory of vine maple, western brackenfern, western swordfern, salal, Oregongrape, and red huckleberry.
DISTRIBUTION AND EXTENT: Southwestern Washington. Series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Clark County, Washington, 1971.
REMARKS: Diagnostic horizons and features recognized in this pedon are an umbric epipedon from the surface to 24 inches, a cambic horizon from 24 to 32 inches, and a fragipan from 32 to 60 inches.