LOCATION TRAPPERCREEK IDEstablished Series
TAXONOMIC CLASS: Medial over loamy, amorphic over mixed, active Typic Haplocryands
TYPICAL PEDON: Trappercreek medial silt loam, forested, on a 5 percent slope at 3,300 feet elevation. Aspect is northeast. When described on July 28, 1994 the soil was dry to 30 inches and moist below. (Colors are for dry soil unless otherwise indicated).
Oi--0 to 2 inches; undecomposed needles, stems, and twigs.
Oe--2 to 4 inches; decomposed needles, stems, and twigs. (O horizon 1 to 4 inches thick)
A--4 to 8 inches; brown (7.5YR 5/4) medial silt loam, dark brown (7.5YR 3/3) moist; weak fine and medium granular structure; soft, very friable, nonsticky and nonplastic; many fine to coarse roots; many very fine irregular pores; 3 percent iron-manganese concretions; slightly acid (pH 6.5); clear smooth boundary. (3 to 11 inches thick)
Bw--8 to 19 inches; brownish yellow (10YR 6/6) medial silt loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure parting to moderate very fine and fine granular; soft, very friable, nonsticky and nonplastic; many fine and medium, common coarse roots; many very fine irregular pores; 5 percent iron-manganese concretions; slightly acid (pH 6.5); abrupt wavy boundary. (11 to 20 inches thick)
2Bt1--19 to 32 inches; light yellowish brown (10YR 6/4) silt loam, brown (7.5YR 5/4) moist; moderate medium and coarse subangular blocky structure; hard, firm, slightly sticky and moderately plastic; common fine and medium roots located between peds, common very fine roots throughout; common very fine and fine irregular and tubular pores; common continuous distinct dark yellowish brown (10YR 4/4) clay films located on faces of peds and in pores; common continuous distinct pink (7.5YR 7/3) skeltans located on faces of peds; 2 percent fine mica flakes; one large 3 inch krotovina running vertical; moderately acid (pH 6.0); clear smooth boundary. (7 to 15 inches thick)
2Bt2--32 to 46 inches; light yellowish brown (10YR 6/4) silt loam, brown (7.5YR 4/4) moist; moderate coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; common very fine and fine, few medium roots located between peds, few very fine roots located throughout; common very fine and fine tubular pores; common continuous distinct brown (7.5YR 4/4) clay films located on faces of peds and in pores; few black iron-manganese stains located on faces of peds; 5 percent fine mica flakes; moderately acid (pH 5.7); clear wavy boundary. (0 to 16 inches thick)
2Bt3--46 to 60 inches; reddish yellow (7.5YR 6/6) silty clay loam, strong brown (7.5YR 5/6) moist; strong coarse subangular blocky structure; very hard, very firm, moderately sticky and moderately plastic; few very fine and fine roots located between peds, few very fine roots located throughout; common very fine and fine tubular pores; many continuous distinct brown (7.5YR 4/4) clay films located on faces of peds and in pores; few black iron-manganese stains located on faces of peds; 3 percent fine mica flakes; moderately acid (pH 5.7); gradual wavy boundary. (8 to 41 inches thick)
2Bt4--60 to 79 inches; reddish yellow (7.5YR 6/6) silty clay loam, brown (7.5YR 4/4) moist; strong very coarse subangular blocky structure; very hard, very firm, moderately sticky and moderately plastic; few very fine roots located between peds; few very fine tubular pores; many continuous prominent brown (7.5YR 4/4) clay films located on faces of peds and in pores; 2 percent fine mica flakes located in horizontal bands; strongly acid (pH 5.5); gradual smooth boundary. (0 to 12 inches thick)
2Bt5--79 to 85 inches; brown (7.5YR 5/4) silt loam, brown (7.5YR 4/4) moist; moderate coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few very fine roots located between peds; few very fine tubular pores; many continuous distinct brown (7.5YR 4/4) clay films located on faces of peds and in pores; 10 percent fine mica flakes; strongly acid (pH 5.5).
TYPE LOCATION: Clearwater County, Idaho; about 4 miles north of Pierce, Idaho; about 150 feet south and 1,700 feet east of the northwest corner of sec. 16, T.37N., R5E. Latitude - 46 degrees, 33 minutes, 23 seconds North; Longitude - 115 degrees, 50 minutes, 12 seconds West; USGS Jaype Quadrangle.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 38 to 41 degrees F.
Average summer soil temperature - 44 to 47 degrees F (Cryic temperature regime)
Soil moisture regime - usually moist year round and not dry for 45 consecutive days during June to October. (Udic moisture regime)
Thickness of volcanic ash mantle - 15 to 23 inches
Volcanic glass - 15 to 50 percent
Acid-oxalate extractable Al+1/2Fe - 1.5 to 2.7 percent
Phosphorous retention - 55 to 90 percent
15 bar water retention - 8.0 to 12.0 percent on air dried samples
A horizon
Hue - 7.5YR or 10YR dry or moist
Value - 4 to 6 dry, 2 or 3 moist
Chroma - 2 to 4 dry, 1 to 4 moist
Clay content - 8 to 10 percent
Reaction - strongly acid to slightly acid
Bulk density - 0.65 to 0.90 g/cc
Bw horizon
Hue - 7.5YR or 10YR dry or moist
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 4 to 6 dry or moist
Clay content - 8 to 10 percent
Reaction - strongly acid to slightly acid
Bulk density - 0.65 to 1.00 g/cc
2Bt horizons
Hue - 7.5YR or 10YR dry or moist
Value - 5 to 7 dry, 4 or 5 moist
Chroma - 4 to 6 dry, 3 to 6 moist
Textures - L, SIL, CL, SICL
Clay content - 15 to 36 percent
Rock fragments - 0 to 10 percent gravel
Reaction - very strongly acid to moderately acid
2BC and 2C horizons (present in some profiles)
Hue - 10YR or 7.5YR dry or moist
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 to 6 dry or moist
Textures - L, SL, GRV-LS
Clay content - 10 to 20 percent
Rock fragments - 0 to 35 percent gravel
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Trappercreek soils are on stream terraces at elevations of 3,300 to 3,900 feet with slopes of 5 to 25 percent. These soils are formed in mixed alluvium with a thick mantle of volcanic ash. The average annual temperature is 38 to 41 degrees F. and the average annual precipitation is 45 to 50 inches. The frost-free season is 30 to 100 days (9 in 10 years to 1 in 10 years, respectively).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Narnett, Brodeer, and the Mushel series. Narnett soils are on convex stream terraces and have thin volcanic ash mantles. Brodeer soils are on concave mountain slopes and are frigid. Mushel soils are on convex mountain slopes, have thin volcanic ash mantles and are frigid.
DRAINAGE AND PERMEABILITY: Well drained; slow to medium runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used for timber production, livestock grazing, recreation, and wildlife habitat. Potential natural vegetation is subalpine fir, Engelmann spruce, lodgepole pine, western white pine, grand fir, with an understory of queencup beadlily, bunchberry dogwood, western goldenthread, coolwort foamflower, longtube twinflower, starry false Solomons seal, western rattlesnake plantain, trappers labrador tea, big blueberry, rustyleaf menziesia, and beargrass.
DISTRIBUTION AND EXTENT: North Central Idaho. Trappercreek soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Clearwater County, Idaho, 2003.
REMARKS: Diagnostic horizons and other features recognized in this pedon are:
Ochric epipedon - The zone from 4 to 8 inches. (A horizon)
Cambic horizon - The zone from 8 to 19 inches. (Bw horizon)
Volcanic ash mantle - The zone from 4 to 19 inches (A and Bw horizon).
Particle-size control section - The zone from 4 to 44 inches (A, Bw, 2Bt1, 2Bt2 and part of the 2Bt3 horizon).
The ranges of values listed under the Range in Characteristics for Bulk density, Volcanic glass content, Acid-oxlate Al+1/2 Fe, Phosphate retention and 15-bar water retention are estimates only.
Additional data: This series has laboratory data S94-ID-035-004 (95P131) Clearwater county, Idaho; by NSSL, Lincoln, NE.