LOCATION ALDERMAND               ID

Established Series
Rev. KWH-BDG-EMM
05/2013

ALDERMAND SERIES

The Aldermand series consists of very deep, well-drained soils that
formed in mixed volcanic ash and material from granitic or metamorphic rock. Aldermand soils are on mountains and canyons and have slopes of 35 to 85 percent. Saturated hydraulic conductivity is moderately high in the upper part and rapid in the lower part. The average annual precipitation is about 30 inches, and the average annual air temperature is about 42 degrees F.

TAXONOMIC CLASS: Coarse-loamy, isotic, frigid Vitrandic Eutrudepts

TYPICAL PEDON: Aldermand ashy loam, forested, on a 65 percent slope on a northeasterly aspect at an elevation of 2,120 feet. (Colors are for dry soil unless otherwise noted.)

Oi--0 to 1 inch; slightly decomposed needles, leaves, and twigs.

Oe--1 to 2 inches; fresh and moderately decomposed needles, leaves, and twigs.

A--2 to 7 inches; brown (7.5YR 5/3) ashy loam, dark brown (7.5YR 3/3) moist; weak fine granular structure; loose, slightly sticky and nonplastic; many very fine and common fine and medium roots throughout; many very fine and fine and few medium irregular pores; 2 percent fine rounded iron-manganese concretions; 2 percent fine mica flakes; 3 percent fine gravel; neutral (pH 7.2); clear smooth boundary. (1 to 8 inches thick)

Bw1--7 to 12 inches; brown (7.5YR 5/3) ashy loam, dark brown (7.5YR 3/3) moist; weak very fine and fine subangular blocky structure parting to weak fine granular; soft, very friable, slightly sticky and nonplastic; many very fine, common fine and medium and few coarse roots throughout; many very fine and fine irregular pores; 2 percent fine rounded iron-manganese concretions; 5 percent fine mica flakes; 3 percent fine gravel; neutral (pH 7.1); clear wavy boundary.

Bw2--12 to 17 inches; yellowish brown (10YR 5/4) ashy loam, dark brown (10YR 3/3) moist; weak very fine and fine subangular blocky structure parting to moderate fine granular; soft, very friable, slightly sticky and nonplastic; many very fine, common fine, and few coarse roots throughout; many very fine and common fine irregular pores; 2 percent fine rounded iron-manganese concretions; 5 percent fine mica flakes; 5 percent gravel; neutral (pH 6.9); clear wavy boundary. (combined thickness of Bw horizons is 5 to 21 inches thick)

2Bw3--17 to 25 inches; light yellowish brown (10YR 6/4) sandy loam, dark brown (10YR 3/3) moist; weak very fine, fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine and common medium roots; common very fine and few fine irregular and common very fine tubular pores; 5 percent fine mica flakes; 10 percent fine gravel; slightly acid (pH 6.3); gradual wavy boundary. (6 to 31 inches thick)

2BC--25 to 33 inches; light yellowish brown (10YR 6/4) sandy loam, dark brown (10YR 3/3) moist; weak very fine, fine and medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and few fine and medium roots throughout; common very fine and few fine irregular and common very fine tubular pores; 10 percent fine mica flakes; 10 percent gravel; slightly acid (pH 6.3); gradual wavy boundary. (0 to 35 inches thick)

2C1--33 to 44 inches; pale brown (10YR 6/3) gravelly sandy loam, dark brown (10YR 3/3) moist; weak very fine and fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine and few fine roots throughout; many very fine and common fine irregular pores; 15 percent fine mica flakes; 25 percent gravel; slightly acid (pH 6.3); gradual wavy boundary.

2C2--44 to 62 inches; pale brown (10YR 6/3) very stony loamy sand; dark brown (10YR 3/3) moist; massive; loose, nonsticky and nonplastic; few very fine and fine roots throughout; many very fine and common fine irregular pores; 15 percent fine mica flakes; 20 percent gravel, 35 percent stones; slightly acid (pH 6.4).

TYPE LOCATION: Clearwater County, Idaho; about 6 miles north and 1.5 miles iast of Ahsahka, Idaho; about 650 feet north and 1,150 feet east of the southwest corner of sec. 35, T. 38 N., R. 1 E.; Latitude - 46 degrees, 35 minutes, 12 seconds North; Longitude - 116 degrees, 18 minutes, 13 seconds West; USGS Ahsahka Quadrangle.

RANGE IN CHARACTERISTICS:

Depth to weathered bedrock - 60 or more inches
Average annual soil temperature - 41 to 46 degrees F.
Frigid temperature regime
Average summer soil temperature - 59 to 61 degrees F (without an 0 horizon)
Soil moisture control section - not dry between depths of 8 to 24 inches for 45 consecutive days in summer and early fall.
Udic moisture regime.
Base Saturation (ammonium acetate) - 60 to 100 percent between 10 and 30 inches
Depth of mixed ash mantle - 7 to 25 inches

A and Bw horizons
Hue - 10YR or 7.5YR
Value - 3 to 7 dry, 3 to 5moist
Chroma - 2 to 4 dry, 1 to 4 moist
Texture - ashy loam, ashy silt loam, or ashy coarse sandy loam
Clay content - 8 to 15 percent
Rock fragments - 0 to 10 percent gravel, 0 to 5 percent cobbles, 0 to 10 percent total rock fragment content
Reaction - 5.0 to 7.2
Acid-oxalate AL plus 1/2 FE - 0.40 to 1.13 percent
Volcanic glass content - 5 to 35 percent

2Bw horizons
Value - 5 to 7 dry, 3 to 6 moist
Chroma - 3 or 4 dry, 3 to 6 moist
Texture - loam, sandy loam, coarse sandy loam, or loamy sand
Clay content - 5 to 16 percent
Rock fragments - 0 to 30 percent gravel, 0 to 30 percent cobbles, 0 to 40 percent stones, 0 to 50 percent total rock fragment content
Reaction - 4.9 to 6.8

2BC horizon
Hue - 7.5YR or 10YR
Value - 6 or 7 dry, 3 to 5 moist
Chroma - 3 to 6 moist
Texture - loam, sandy loam, coarse sandy loam, loamy sand, or loamy coarse sand
Clay content - 3 to 16 percent
Rock fragments - 2 to 20 percent gravel, 0 to 5 percent cobbles, 2 to 25 percent total rock fragment content
Reaction - 4.7 to 6.4

2C horizons
Hue - 5YR to 2.5Y
Value - 5 to 8 dry, 3 to 6 moist
Chroma - 2 to 6 dry or moist
Texture - loam, sandy loam, coarse sandy loam, loamy sand, loamy coarse sand, sand or coarse sand
Clay content - 0 to 14 percent
Rock fragments - 0 to 40 percent gravel, 0 to 40 percent cobbles, 0 to 35 percent stones, 0 to 55 percent total rock fragment content
Reaction - 4.6 to 6.5

COMPETING SERIES:
Mannering soils: have low chroma redoximorphic features at a depth of 50 to 100 cm.

GEOGRAPHIC SETTING: Aldermand soils are on canyon and mountain sideslopes at elevations of 1,200 to 4,940 feet (366 to 1506 meters). The slope range is 35 to 85 percent. These soils formed in mixed volcanic ash and material weathered from granitic residuum. The average annual temperature ranges from 41 to 46 degrees F. The average annual precipitation ranges from 27 to 65 inches (686 to 1650 mm) and the frost-free season is 50 to 100 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Crumarine, Kauder (T),
Texascreek and Uvi series. Crumarine soils are in drainageways and are somewhat poorly drained. Kauder soils are on hills, have a volcanic ash mantle and have a fragipan. Texascreek soils are on south and west-facing convex slopes and have a mesic soil temperature regime. Uvi soils are on similar landscapes and are fine-loamy in the particle-size control section.

DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium to rapid. Permeability is moderate in the upper part and rapid in the lower part.

USE AND VEGETATION: This soil is used primarily for timber production,
livestock grazing, wildlife habitat, recreation, and watershed. The
natural vegetation is mainly western redcedar, grand fir, western
larch, Douglas-fir, Myrtle pachystima, goldthread, common princes pine,
queencup beadlily and sweetscented bedstraw.

DISTRIBUTION AND EXTENT: North-central Idaho. Aldermand soils are moderately extensive.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Clearwater County, Idaho, 1979.

REMARKS: Diagnostic horizons and features recognized in this pedon:

Ochric epipedon - the zone from 2 to 7 inches (A horizon).
Vitrandic feature - the zone from 2 to 17 inches (A, Bw1, Bw2 horizons).
Cambic horizon - the zone from 7 to 25 inches (Bw and 2Bw horizons).
Particle-size control section - the zone from 12 to 42 inches (Bw1, Bw2, 2Bw3, 2BC and part of the 2C1 hrozions).

The ranges in values listed under the A and Bw horizons for volcanic glass content and acid-oxalate extractable Al + 1/2 Fe are estimates only.

ADDITIONAL DATA: Laboratory data is available for two pedons of Aldermand. Soil survey sample numbers - S92ID-035-026 (this pedon) and S92ID-035-027; Pedon numbers - 92P 964 and 92P 965. (Soil survey sample no. S92ID-035-027 was originally sampled as Oviatt series).

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National Cooperative Soil Survey
U.S.A.