LOCATION DODGECREEK IDEstablished Series
TAXONOMIC CLASS: Sandy, mixed, frigid Andic Dystrudepts
TYPICAL PEDON: Dodgecreek ashy silt loam, woodland; on a southeast-facing slope of 7 percent at 3,500 feet elevation. When described on July 6, 1994, the soil was moist throughout. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 1 inch; needles, leaves, twigs and cones. (0.5 to 1 inch thick)
Oe-1 to 2 inches; decomposed organic matter mixed with Mt. St. Helen's volcanic ash. (0.5 to 1.5 inches thick)
A--2 to 3 inches; grayish brown (10YR 5/2) ashy silt loam, very dark grayish brown (10YR 3/2) moist; weak very fine and fine subangular blocky structure parting to weak very fine granular; soft, very friable, nonsticky and slightly plastic; many very fine, common fine, few medium and coarse roots; many very fine tubular pores; slightly acid (pH 6.5); abrupt wavy boundary. (1 to 2 inches thick)
Bw1--3 to 7 inches; yellowish brown (10YR 5/4) ashy silt loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, few fine and medium roots; many very fine tubular pores; neutral (pH 6.8); clear wavy boundary. (3 to 6 inches thick)
Bw2--7 to 10 inches; light yellowish brown (10YR 6/4) ashy loam, dark yellowish brown (10YR 4/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine, few fine and medium roots; many very fine tubular pores; neutral (pH 6.8); clear wavy boundary. (3 to 6 inches thick)
2BC1--10 to 14 inches; very pale brown (10YR 7/4) sandy loam, yellowish brown (10YR 5/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and slightly plastic; common very fine, few fine, medium, and coarse roots; common very fine tubular and irregular pores; 5 percent fine gravel; neutral (pH 6.6); clear wavy boundary. (3 to 10 inches thick)
2BC2--14 to 19 inches; mixed very pale brown (10YR 7/4) and light yellowish brown (10YR 6/4) loamy sand, dark yellowish brown (10YR 4/4) and yellowish brown (10YR 5/4) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; few very fine and fine roots; common very fine tubular and irregular pores; 5 percent fine gravel; slightly acid (pH 6.5); abrupt wavy boundary. (3 to 5 inches thick)
2C1--19 to 47 inches; mixed pale yellow (2.5Y 8/3) and very pale brown (10YR 7/4) coarse sand, pale yellow (2.5Y 7/3) and light yellowish brown (10YR 6/4) moist; single grain; loose, nonsticky and nonplastic; few very fine and fine roots; many very fine irregular pores; 5 percent fine gravel, 5 percent medium and coarse gravel; slightly acid (pH 6.2); gradual wavy boundary. (7 to 28 inches thick)
2C2--47 to 62 inches; pale yellow (2.5Y 8/2) coarse sand, light gray (2.5Y 7/2) moist; single grain; loose, nonsticky and nonplastic; many very fine irregular pores; one very thin clay band; 5 percent fine gravel; slightly acid (pH 6.2).
TYPE LOCATION: Boundary County, Idaho; about 5.0 miles northwest of Naples, about 250 feet south and 250 feet west of the northeast corner of sec. 32, T. 61 N., R. 1 W; Latitude - 48 degrees, 36 minutes, 07 seconds North; Longitude - 116 degrees, 28 minutes, 54 seconds West.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 43 to 45 degrees F.
Average summer soil temperature - 48 to 52 degrees F. with an O horizon
Moisture control section - dry 25 to 35 days (August to September), moist mid-September through July; udic moisture regime
Depth to sandy material - 10 to 22 inches
Clay content - 0 to 5 percent in the particle-size control section
Volcanic ash mantle - 7 to 13 inches thick
Volcanic glass content - 30 to 65 percent
Acid-oxalate extr. Al + 1/2 Fe - 1.0 to 3.0 percent
Phosphate retention - 55 to 90 percent
A horizon
Chroma - 2 or 3 dry or moist
Texture - SIL, L (ashy)
Clay content - 3 to 8 percent
Rock fragment content - 0 to 5 percent gravel
Bulk density - 0.65 to 1.00 grams per cubic centimeter
Reaction - moderately acid to slightly acid
Bw horizons
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 4 or 6 dry or moist
Texture - SIL, L (ashy)
Clay content - 2 to 8 percent
Rock fragment content - 0 to 5 percent gravel
Bulk density - 0.65 to 1.00 grams per cubic centimeter
Reaction - slightly acid to neutral
2BC horizons
Hue - 10YR or 2.5Y
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 through 6 dry or moist
Texture - SL, LS, GR-LS
Clay content - 2 to 5 percent
Rock fragment content - 0 to 25 percent gravel
Reaction - slightly acid to neutral
2Bw horizon - present in some pedons
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 or 4 dry, 4 or 6 moist
Texture - SL, LFS, FSL
Gravel content - 0 to 10 percent
2Bt horizon - present in some pedons
Gravel content - 0 to 10 percent
Lamellae - 0.1 to 0.5 inch thick, few to common
2C horizons
Hue - 10YR, 2.5Y, or variegated
Value - 6 through 8 dry, 4 through 7 moist
Chroma - 2 through 4 dry or moist
Texture - COS, S, GR-COS, GRF-COS, LFS, FS, GR-LCOS, and GRV-COS in lower part of some pedons
Clay content - 0 to 3 percent
Rock fragment content - 0 to 25 percent gravel, 0 to 10 percent cobbles
Reaction - moderately acid to slightly acid
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Dodgecreek soils are on outwash terraces. Slopes range from 2 to 12 percent. They formed in sandy glacial outwash with a thin mantle of volcanic ash. Elevations range from 3,000 to 4,900 feet. The average annual air temperature is 42 to 45 degrees F. and average annual precipitation is 35 to 45 inches. The average frost-free period is 80 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Idamont, Myrtlecreek (T), Pend Oreille, and Snowcreek (T) soils. Idamont and Pend Oreille soils are on mountains and are ashy over loamy in the control section. Myrtlecreek and Snowcreek soils are on steeper terraces and escarpments and have less volcanic ash in the surface mantle.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff; permeability is moderate and moderately rapid in the upper part and rapid and very rapid below.
USE AND VEGETATION: These soils are used for woodland, wildlife habitat, and recreation. Potential natural vegetation is mainly western hemlock, western redcedar, grand fir, western white pine, western larch, Douglas-fir, lodgepole pine, and Engelmann spruce with an understory of common princes pine, darkwoods violet, dampwoods blueberry, longtube twinflower, myrtle pachystima, pyrola, queencup beadlily, common beargrass, western wintergreen, and western rattlesnake plantain.
DISTRIBUTION AND EXTENT: Northern Idaho, and possibly northwestern Montana, and northeastern Washington. Series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Boundary County, Idaho, 2002.
REMARKS: Classification changed from Andic Dystrochrepts to Andic Dystrudeps in 2000 due to revision of Soil Taxonomy.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the mineral soil surface to 7 inches (A and Bw1 horizons)
Cambic horizon - the zone from 3 to 14 inches (Bw1, Bw2, and 2BC1 horizons)
Volcanic ash mantle - the zone from 2 to 10 inches (A, Bw1, Bw2 horizons)
Particle-size control section - the zone from 10 to 40 inches (2BC1, 2BC2, and part of the 2C1 horizon)