LOCATION SHATTUCK ID

Established Series
PNP-BDG-EMM
07/2013

SHATTUCK SERIES

The Shattuck series consists of very deep, well-drained soils that formed in volcanic ash over material weathered from quartzite. Shattuck soils are on mountain slopes and ridges and have slopes of 15 to 75 percent. Permeability is moderately slow. The average annual precipitation is about 45 inches and the average annual air temperature is about 42 degrees F.

TAXONOMIC CLASS: Ashy over loamy-skeletal, amorphic over isotic, frigid Ultic Udivitrands

TYPICAL PEDON: Shattuck ashy silt loam, forested. (Colors are for dry soil unless otherwise noted.)

Oi--0 to 1.5 inches; partially decomposed needles, leaves, and twigs.

Oe--1.5 to 2.5 inches; well decomposed moss, leaves, needles, and twigs. (O horizons 1 to 2.5 inches thick)

A--2.5 to 7 inches; yellowish brown (10YR 5/6) ashy silt loam, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine, and few medium and coarse roots; many very fine and fine irregular pores; slightly acid (pH 6.5); gradual smooth boundary. (2 to 5 inches thick)

Bw1--7 to 14 inches; brownish yellow (10YR 6/6) ashy silt loam, dark brown (7.5YR 3/4) moist; weak fine subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine and fine, and few coarse roots; many very fine and fine irregular pores; slightly acid (pH 6.4); clear smooth boundary.

Bw2--14 to 19 inches; brownish yellow (10YR 6/6) ashy silt loam, dark brown (7.5YR 3/4) moist; weak coarse subangular blocky structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, and few coarse roots; many very fine and fine irregular pores; slightly acid (pH 6.2); abrupt smooth boundary. (Bw horizons 11 to 16 inches thick)

2Bt1--19 to 30 inches; light reddish brown (5YR 6/3) gravelly clay loam, reddish brown (5YR 4/3) moist; moderate coarse subangular blocky structure; hard, firm, moderately sticky and slightly plastic; few coarse roots; many very fine and fine, and few medium irregular, and few fine tubular pores; few faint clay films lining pores; common silt coatings on faces of peds; 20 percent gravel; moderately acid (pH 5.9); gradual wavy boundary.

2Bt2--30 to 44 inches; light reddish brown (5YR 6/3) extremely cobbly clay loam, reddish brown (5YR 4/4) moist; moderate coarse subangular blocky structure; hard, firm, moderately sticky and slightly plastic; common medium roots; many very fine and fine irregular, many very fine and fine, and few medium tubular pores; common faint clay films lining pores; few silt coatings on faces of peds; 20 percent gravel, 40 percent cobbles, 10 percent stones; strongly acid (pH 5.5); gradual wavy boundary. (2Bt horizons 25 to 37 inches thick)

2BC--44 to 63 inches; reddish yellow (5YR 6/6) extremely cobbly clay loam, yellowish red (5YR 5/6) moist; massive; hard, firm, moderately sticky and slightly plastic; few medium roots; many very fine and fine irregular pores; few faint clay films lining pores; 20 percent gravel, 30 percent cobbles, 10 percent stones; strongly acid (pH 5.4).

TYPE LOCATION: Clearwater County, Idaho; about 6 miles north and 3 miles west of Ahsahka, Idaho; about 800 feet east and 2,490 feet south of the northwest corner of sec. 31, T. 38 N., R. 1 E.; on a 24 percent northwest slope. Latitude - 46 degrees, 35 minutes, 27 seconds North; Longitude - 116 degrees, 23 minutes, 24 seconds West; USGS Southwick Quadrangle.

RANGE IN CHARACTERISTICS:

Average annual soil temperature - 39 to 45 degrees F.
Base saturation - less than 35 percent in upper 50 cm of the argillic horizon .
Thickness of volcanic ash mantle - 14 to 21 inches.
Volcanic glass content in the 0.02 to 2 mm fraction - 15 to 60 percent
Acid oxalate extractable Al plus 1/2 Fe - 1.8 to 2.7
Phosphate retention - 55 to 95 percent
15 bar water retention on air dry samples - 7 to 12 percent

A horizon
Hue - 7.5YR or 10YR
Value - 4 or 5 dry
Chroma - 3 to 6 dry, 2 to 4 moist
Texture - ashy-silt loam or ashy-loam
Clay content - 8 to 10 percent
Rock fragments - 0 to 10 percent gravel
Reaction - strongly acid to slightly acid
Bulk density - 0.65 to 0.90 grams/cc

Bw horizons
Hue - 10YR or 7.5YR
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 4 to 6 dry
Texture - ashy-silt loam or ashy-loam
Clay content - 8 to 15 percent
Rock fragments - 0 to 15 percent gravel
Reaction - strongly acid to slightly acid
Bulk density - 0.65 to 0.90 grams/cc

2Bt horizons
Hue - 10YR to 5YR
Value - 6 to 8 dry, 4 to 7 moist
Chroma - 2 to 4 dry, 3 to 6 moist
Textures - clay loam, loam, very fine sandy loam, coarse sandy loam, sandy clay loam, or silt loam
Clay content - 14 to 29 percent
Rock fragments - 5 to 70 percent gravel, 0 to 40 percent cobbles, 0 to 10 percent stones, 15 to 85 percent total rock fragments (weighted average for the control section is greater than 35 percent)
Reaction - extremely acid to moderately acid

2BC horizon
Hue - 7.5YR or 5YR dry, 10YR to 5YR moist
Value - 6 to 8 dry, 3 to 8 moist
Chroma - 2 to 6 dry, 3 to 8 moist
Textures - clay loam, coarse sandy loam, sandy loam, sandy clay loam or loamy sand
Clay content - 8 to 29 percent
Rock fragments - 20 to 75 percent gravel, 0 to 35 percent cobbles, 0 to 10 percent stones, 30 to 85 percent total rock fragments
Reaction - extremely acid to strongly acid

COMPETING SERIES: This is the Flumecreek series. Flumecreek series have moderate permeability.

GEOGRAPHIC SETTING: The Shattuck soils are on mountain slopes and ridges, have elevations of 1,800 to 4,800 feet and have slopes of 15 to 75 percent. The soils formed in a mantle of volcanic ash over material weathered from quartzite. The average annual temperature is 38 to 44 degrees F. The average annual precipitation is 40 to 55 inches and the frost-free season is 50 to 110 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bouldercreek, Dworshak, Kruse, and Teakean soils. Bouldercreek soils occur on mountain slopes and lack an argillic horizon. Dworshak soils occur on mountain slopes and are in an Ashy over loamy family. Kruse soils occur on mountain slopes, ridges and canyon sides. They have a xeric moisture regime and a vitrandic surface. Teakean soils occur on mountain slopes. They have a xeric moisture regime and a fragipan.

DRAINAGE AND PERMEABILITY: Well drained; very rapid runoff; moderately slow permeability.

USE AND VEGETATION: This soil is used mainly for timber production, woodland grazing, wildlife habitat and watershed. The natural vegetation is western redcedar, grand fir, Douglas-fir, and western larch with an understory of queencup beadlily, longtube twinflower, western rattlesnake platain, baldhip rose, common snowberry, and Myrtle pachystima.

DISTRIBUTION AND EXTENT: North-central, Idaho; Shattuck soils are not extensive. MLRA 43A.

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

SERIES ESTABLISHED: Clearwater County, Idaho, 2003.

REMARKS: This soil is named after a local mountain.

Diagnostic horizons and other features recognized in this pedon are:

Volcanic ash mantle - The zone from 2.5 inches to 19 inches. (A, Bw1, Bw2 horizons)

Ochric epipedon - The zone from 0 inches to 7 inches. (Oi, Oe and A horizons)

Cambic horizon - The zone from 7 to 19 inches. (Bw1 and Bw2 horizons)

Argillic horizon - The zone from 19 to 44 inches. (2Bt1 and 2Bt2 horizons)

Particle-size control section - The zone from 2.5 to 42.5 inches. (A, Bw1, Bw2, 2Bt1, 2Bt2 horizons)

The ranges of values listed under the Range in Characteristics for Bulk density, 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.