LOCATION MEADOWPORT IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active Andic Haplocryalfs
TYPICAL PEDON: Meadowport ashy silt loam, forestland; on a north facing slope of 20 percent at 3800 feet elevation. When described on July 11, 1984, the soil was moist throughout. (Colors are for dry soil unless otherwise stated).
Oi--0 to 1 inch; needles, leaves, and twigs.
Oe--1 to 1.5 inches; decomposed organic matter.
A--1.5 to 5 inches; pale brown (10YR 6/3) ashy silt loam, dark brown (10YR 4/3) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine and fine roots; many very fine and fine tubular pores; common fine rounded iron and manganese concretions; slightly acid (pH 6.5); clear wavy boundary. (3 to 4 inches thick)
Bw--5 to 13 inches; light yellowish brown (10YR 6/4) ashy silt 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, fine, and few medium roots; common very fine and fine tubular pores; common fine rounded iron and manganese concretions; neutral (pH 6.7); clear wavy boundary. (6 to 8 inches thick)
2Bt/E1--13 to 18 inches; mixed light yellowish brown (10YR 6/4) and very pale brown (10YR 7/3) silt loam, dark yellowish brown (10YR 4/4) and brown (10YR 5/3) moist; moderate coarse prismatic structure parting to moderate medium angular blocky; hard, firm, slightly sticky and slightly plastic; few very fine, fine, and medium roots; common very fine tubular pores; common faint clay films on faces of peds and lining pores; 15 percent E material between peds; slightly acid (pH 6.2); clear wavy boundary. (5 to 9 inches thick)
2Bt/E2--18 to 26 inches; mixed light yellowish brown (10YR 6/4) and very pale brown (10YR 7/3) silt loam, dark yellowish brown (10YR 4/4) and brown (10YR 5/3) moist; moderate coarse prismatic structure parting to weak coarse angular blocky; hard, firm, slightly sticky and plastic; few very fine roots; common very fine and few fine tubular pores; few faint clay films lining pores; common faint very pale brown (10YR 8/2) silt coatings on faces of peds; 15 percent E material between peds; strongly acid (pH 5.5); gradual wavy boundary. (7 to 10 inches thick)
2Btb1--26 to 40 inches; light yellowish brown (10YR 6/4) silty clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium and coarse subangular blocky structure; hard, firm, sticky and plastic; few very fine roots; few very fine tubular pores; common faint clay films on faces of peds and lining pores; 5 percent fine garnet pebbles; very strongly acid (pH 5.0); gradual wavy boundary. (11 to 14 inches thick)
2Btb2--40 to 61 inches; light yellowish brown (10YR 6/4) silty clay loam, dark yellowish brown (10YR 4/4) moist; strong coarse subangular blocky structure; very hard, very firm, very sticky and plastic; few very fine roots; few very fine and fine tubular pores; many faint and common distinct clay films on faces of peds and lining pores; 10 percent fine garnet pebbles; very strongly acid (pH 4.6).
TYPE LOCATION: Shoshone County, Idaho; about 18 miles east of Clarkia, about 100 feet north and 1100 feet west of the southeast corner of section 31, T.42 N., R.5 E. Latitude - 46 degrees, 52 minutes, 22 seconds North. Longitude - 115 degrees, 56 minutes, 13 seconds West. USGS Little Goat Mountain quadrangle.
RANGE IN CHARACTERISTICS:
Depth to bedrock - more than 60 inches
Solum thickness - more than 55 inches
Moisture control section - dry August to mid September (15 to 25 days); moist mid September through July (Udic moisture control section)
Average annual soil temperature - 39 to 42 degrees F
Average summer soil temperature - 44 to 46 degrees F with an O horizon (Cryic temperature regime)
Depth to perched water table - 18 to 30 inches (February to April)
Volcanic ash mantle - 9 to 12 inches thick
Volcanic glass content - 30 to 65 percent
Acid-oxalate extractable Al + 1/2 Fe - 1.0 to 3.0 percent
A horizon
Value - 5 or 6 dry and 3 or 4 moist
Clay content - 4 to 8 percent
Rock fragments - 0 to 10 percent gravel
Bulk density - 0.65 to 0.85 g/cc
Reaction - slightly acid or neutral
Bw horizon
Value - 5 or 6 dry and 3 or 4 moist
Clay content - 4 to 8 percent
Rock fragments - 0 to 10 percent gravel
Bulk density - 0.65 to 0.85 g/cc
2Bt/E horizon
Clay content - 18 to 26 percent
Rock fragments - 0 to 10 percent gravel
Reaction - strongly acid to slightly acid
2Btb horizon
Chroma - 4 to 6 dry or moist
Clay content - 28 to 35 percent
Rock fragments - 0 to 15 percent gravel
Reaction - very strongly acid to moderately acid
C horizon
Present in some pedons below 55 inches
Hue - 10YR
Value - 6 dry and 4 moist
Chroma - 4 or 6 dry or moist
Texture - CBV-SL or CBV-L
Rock fragments - 20 to 25 percent rounded gravel, 30 to 35 percent rounded cobbles
Reaction - slightly acid
COMPETING SERIES: This is the Lynxcreek series. Lynxcreek soils are dry more than 45 days during summer and early fall and lack Btb horizons.
GEOGRAPHIC SETTING: Meadowport soils are on all aspects on terraces. Slopes range from 15 to 35 percent. These soils formed in glacial lacustrine sediments and old alluvium derived from granite and schist, with a mantle of volcanic ash. Elevations range from 3700 to 4000 feet. The average annual air temperature ranges from 38 to 43 degrees F, average annual precipitation is 50 to 65 inches, and frost-free season is 30 to 100 days (9 in 10 years to 1 in 10 years, respectively).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Floodwood, Garveson, and Odonnell soils. Floodwood soils are on foothills and mountains, and are frigid and well drained. Garveson soils are on mountains, and are well drained and frigid and ashy over sandy or sandy-skeletal. Odonnell soils are on terraces and are frigid.
DRAINAGE AND PERMEABILITY: moderately well drained; rapid runoff; slow permeability.
USE AND VEGETATION: These soils are used for timber production, wildlife habitat, recreation, placer garnet mining, and watershed. Potential natural vegetation is mainly subalpine fir, Engelmann spruce, and western redcedar, with an understory of rustyleaf menziesia, arrowleaf groundsel, claspleaf twistedstalk, queencup beadlily, threeparted miterwort, starry false-solomons-seal, wild ginger, dampwoods blueberry, Carolina bugbane, baneberry, bearberry honeysuckle, and Columbia brome.
DISTRIBUTION AND EXTENT: This soil is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Shoshone County, Idaho, 1993.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from 1.5 to 5 inches (A horizon)
Argillic horizon - the zone from 13 to 61 inches (2Bt/E1, 2Bt/E2, 2Btb1, and 2Btb2 horizons)
Glossic horizon - the zone from 13 to 18 inches (2Bt/E1 horizon)
Volcanic ash mantle - the zone from 1.5 to 13 inches (A and Bw horizons)
Particle-size control section - the zone from 13 to 33 inches (2Bt/E1, 2Bt/E2, and part of 2Btb1 horizon)