LOCATION JUDGETOWN ID

Established Series
Rev: BLR-BDG-EMM
06/2013

JUDGETOWN SERIES

The Judgetown series consists of deep, well drained soils formed in weathered granitic residuum with thick volcanic ash mantles. They are on mountain slopes and ridges. Saturated hydraulic conductivity is moderately high to 17 inches and high below this depth. Slopes range from 5 to 75 percent. The average precipitation is about 42 inches and the average annual temperature is about 42 degrees F.

TAXONOMIC CLASS: Ashy over loamy, amorphic over isotic, frigid Typic Udivitrands

TYPICAL PEDON: Judgetown ashy loam, forested, on a 20 percent slope at 3,240 feet elevation. Aspect is northwest. When described on October 20, 1992 the soil was moist to 20 inches and dry below. (Colors are for dry soil unless otherwise noted).

Oi--0 to 1 inches; fresh and partially decomposed needles, twigs, leaves, and moss.

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

A--2 to 4 inches; brown (7.5YR 4/2) ashy loam, dark brown (7.5YR 3/2) moist; weak very fine and fine granular structure; very soft, very friable, nonsticky and nonplastic; many fine and medium, few coarse roots; many very fine and fine irregular pores; 2 percent fine rounded iron-manganese concretions; moderately acid (pH 5.8); clear smooth boundary. (2 to 10 inches thick).

Bw1--4 to 17 inches; light yellowish brown (10YR 6/4) ashy loam, dark brown (7.5YR 3/4) moist; weak fine and medium subangular blocky structure parting to weak very fine and fine granular; soft, very friable, slightly sticky and slightly plastic; many very fine and fine, common medium and coarse roots; many very fine and fine irregular pores; 5 percent fine rounded iron-manganese concretions; slightly acid (pH 6.3); abrupt wavy boundary. (8 to 23 inches thick).

2Bw2--17 to 22 inches; brown (10YR 5/3) sandy loam, dark yellowish brown (10YR 3/4) moist; moderate medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common fine and medium, few coarse roots; common very fine and fine irregular, few medium tubular pores; 2 percent fine mica flakes; one 3 inch wide krotovina filled with volcanic ash; slightly acid (pH 6.3); clear wavy boundary.

2Bw3--22 to 30 inches; brown (10YR 5/3) sandy loam, brown (10YR 4/3) moist; moderate fine and coarse subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common fine and medium roots; common very fine and fine irregular, few very fine tubular pores; 2 percent fine mica flakes; 5 percent gravel; slightly acid (pH 6.1); clear smooth boundary. (10 to 30 inches thick).

2BC--30 to 36 inches; yellowish brown (10YR 5/4) loamy sand, brown (10YR 5/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; common very fine and fine roots; common very fine irregular pores; 3 percent fine mica flakes; 10 percent gravel; slightly acid (pH 6.3); gradual smooth boundary. (0 to 21 inches thick).

2C--36 to 52 inches; light yellowish brown (2.5Y 6/3) loamy coarse sand, light olive brown (2.5Y 5/3) moist; massive; slightly hard, friable, nonsticky and nonplastic; few very fine roots throughout and few coarse roots in cracks; few very fine irregular pores; 5 percent fine mica flakes; slightly acid (pH 6.2); clear smooth boundary. (6 to 22 inches thick).

2Cr--52 inches; decomposing granitic bedrock.

TYPE LOCATION: Clearwater County, Idaho; about 2 miles northwest of Pierce, Idaho; about 200 feet south and 200 feet west of the northeast corner of sec. 32, T. 37 N., R. 5 E.; Latitude - 46 degrees, 30 minutes, 47 seconds, North; Longitude - 115 degrees, 50 minutes, 38 seconds, West. USGS Jaype Quadrangle.

RANGE IN CHARACTERISTICS:

Average annual soil temperature - 39 to 45 degrees F.
Frigid temperature regime.
Soil moisture regime - not dry for 45 consecutive days during 4 months that follow summer solstice.
Udic moisture regime.
Thickness of volcanic ash mantle - 14 to 32 inches
Volcanic glass content - 30 to 50 percent
Acid-oxalate extractable Al plus 1/2 Fe - 1.5 to 2.5 percent
Phosphate retention - 60 to 80 percent
15-bar water retention on air dried samples - 9 to 12 percent

A horizon
Hue - 7.5YR or 10YR
Value - 3 to 5 dry, 2 or 3 moist
Chroma - 2 to 4 dry or moist
Textures - ashy silt loam or ashy loam
Clay content - 8 to 10 percent
Rock fragments - 0 to 15 percent gravel
Reaction - 5.6 to 7.0
Bulk density - 0.60 to 0.90 g/cc

Bw horizon
Hue - 7.5YR or 10YR
Value - 5 to 7 dry, 3 or 4 moist
Chroma - 3 or 4 dry, 3 to 6 moist
Textures - ashy silt loam or ashy loam
Clay content - 8 to 10 percent
Rock fragments - 0 to 15 percent gravel
Reaction - 5.0 to 6.8
Bulk density - 0.60 to 1.10 g/cc

2Bw horizons
Value - 5 to 8 dry, 3 to 6 moist
Chroma - 3 or 4 dry, 3 to 6 moist
Textures - loam, fine sandy loam, sandy loam, coarse sandy loam or loamy sand
Clay content - 8 to 25 percent
Rock fragments - 0 to 30 percent gravel, 0 to 10 percent cobbles, 0 to 30 percent total rock fragments
Reaction - 5.0 to 6.3

2BC horizon
Value - 5 to 8 dry, 4 or 5 moist
Chroma - 4 to 6 dry, 3 to 6 moist
Textures - sandy loam, coarse sandy loam or loamy sand
Clay content - 5 to 12 percent
Coarse fragments - 10 to 23 percent gravel
Reaction - 5.0 to 6.3

2C horizon
Hue - 10YR or 2.5Y
Value - 6 to 8 dry, 5 or 6 moist
Chroma - 3 or 4 dry, 3 to 6 moist
Textures - fine sandy loam, sandy loam, coarse sandy loam, loamy sand, loamy coarse sand or coarse sand
Clay content - 2 to 12 percent
Coarse fragments - 0 to 50 percent gravel, 0 to 15 percent cobbles, 0 to 10 percent stones, 0 to 50 percent total rock fragments
Reaction - 4.3 to 6.3

COMPETING SERIES: These are the Dullaxe, Flewsie and Gorhamgulch series.

Flewsie soils: are very deep, have soft quartzite fragments in the subsoil and do not have fine mica flakes

Dullaxe soils: are very deep

Gorhamgulch soils: have an ash mantle with >60 percent volcanic glass and have 2Eb horizons

GEOGRAPHIC SETTING: Judgetown soils are on mountain slopes and ridges at elevations of 1,600 to 5,200 feet (489 to 1585 Meters) with slopes of 5 to 75 percent. These soils are formed in weathered granitic residuum with a thick volcanic ash mantle. The average annual temperature is 38 to 44 degrees F. and the average precipitation is 29 to 60 inches (686 to 1524 mm). The frost-free season is 50 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the, Fico, Garveson, Jury, and Weitas soils. Fico soils are on smooth mountain ridgetops and have cryic soil temperature regimes. Garveson soils are on convex mountain side slopes and are sandy-skeletal. Jury soils are on concave mountain side slopes are very deep and have a medial surface layer. Weitas soils are on concave mountain ridgetops, have cryic soil temperature regimes, have umbric epipedons, and are very deep.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained, medium to very rapid runoff, moderately high saturated hydraulic conductivity to 17 inches and high below this depth.

USE AND VEGETATION: These soils are used for timber production, wildlife habitat, watershed, and recreation. Potential natural vegetation is western red cedar, grand fir, western white pine, western larch and Douglas-fir with an understory of queencup beadlilly, wild ginger, common goldthread, oneleaf foamflower, bunchberry dogwood, prince's pine, myrtle pachystima, and rustyleaf menziesia.

DISTRIBUTION AND EXTENT: North Central Idaho, Judgetown soils are moderately extensive. MLRA 43A.

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 0 to 4 inches (Oi, Oe, and A horizon).

Volcanic ash mantle - the zone from 2 to 17 inches (A and Bw1 horizons).

Cambic horizon - the zone from 4 to 30 inches ( Bw1, 2Bw2, and 2Bw3 horizons).

Paralithic contact - the zone below 52 inches (2Cr horizon).

Particle-size control section - the zone from 2 to 42 inches (A, Bw1, 2Bw2, 2Bw3, 2BC, and part of the 2C horizon).

The ranges of values listed under the Range In Characteristics for the soil properties Volcanic glass content, Acid-oxalate Al+1/2 Fe, Phosphate retention and 15-bar water retention are estimates only.

National Cooperative Soil Survey
U.S.A.