LOCATION HUCKLE                  ID

Established Series
Rev. GDM/BDG/RJS
11/2015

HUCKLE SERIES

The Huckle series consists of deep, well drained soils on mountains. They formed in colluvium over residuum derived from metasedimentary bedrock (predominantly siltite and fine grained quartzite), with a thick mantle of volcanic ash. Slopes are 5 to 70 percent. Mean annual air temperature is about 6.5 degrees C and mean annual precipitation is about 750 mm.

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

TYPICAL PEDON: Huckle ashy silt loam, forested; on a northwest-facing slope of 42 percent at an elevation of 1,065 meters. When described on June 19, 2000, the soil was moist throughout. (Colors are for dry soil unless otherwise stated.)

Oi--0 to 3 cm; slightly decomposed needles, leaves, twigs, cones, and bark. (1 to 4 cm thick)

Oe--3 to 8 cm; decomposed organic matter mixed with 1980 Mt. St. Helens volcanic ash. (1 to 5 cm thick)

A--8 to 10 cm; dark grayish brown (10YR 4/2) ashy silt loam, very dark brown (10YR 2/2) moist; weak very fine and fine granular structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and common medium and coarse roots; many very fine, fine, and common medium tubular pores; 10 percent gravel; neutral (pH 7.0); abrupt wavy boundary. (2 to 8 cm thick)

Bwl--10 to 20 cm; yellowish brown (10YR 5/4) ashy silt loam, dark yellowish brown (10YR 3/4) moist; weak fine and medium subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and common medium and coarse roots; many very fine and common fine tubular pores; 10 percent gravel; neutral (pH 6.8); gradual wavy boundary. (10 to 15 cm thick)

Bw2--20 to 33 cm; light yellowish brown (10YR 6/4) ashy silt loam, dark yellowish brown (10YR 4/4) moist; weak medium and coarse subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine, fine, and common medium and coarse roots; many very fine, fine, and common medium tubular pores; 10 percent gravel; neutral (pH 6.6); gradual wavy boundary. (13 to 35 cm thick)

Bw3--33 to 48 cm; light yellowish brown (10YR 6/4) gravelly ashy silt loam, dark yellowish brown (10YR 4/4) moist; weak medium and coarse subangular blocky structure; soft, very friable, nonsticky and slightly plastic; many very fine and fine, common medium, and few coarse roots; many very fine, fine, and common medium tubular pores; 15 percent gravel; slightly acid (pH 6.5); abrupt wavy boundary. (0 to 15 cm thick)

2Bw4--48 to 71 cm; pale brown (10YR 6/3) very cobbly silt loam, brown (10YR 4/3) moist; weak medium and coarse subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and few medium and coarse roots; many very fine, fine, and few medium and coarse tubular pores; 15 percent gravel and 35 percent cobbles; neutral (pH 6.6); clear wavy boundary. (13 to 45 cm thick)

2BC--71 to 97 cm; very pale brown (10YR 8/4) extremely cobbly silt loam, light yellowish brown (10YR 6/4) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and few medium and coarse roots; common very fine, fine, and few medium and coarse tubular pores; 20 percent gravel, 40 percent cobbles, and 3 percent fine paragravel; slightly acid (pH 6.5); gradual wavy boundary. (20 to 30 cm thick)

2C--97 to 119 cm; yellow (10YR 8/6) extremely cobbly loam, brownish yellow(10YR 6/6) moist; massive; slightly hard, friable, slightly sticky and slightly plastic; common very fine, fine, and few medium and coarse roots; common very fine, fine, and few medium and coarse tubular pores; 20 percent gravel, 40 percent cobbles, 5 percent stones, and 10 percent fine paragravel; slightly acid (pH 6.5); clear wavy boundary. (20 to 25 cm thick)

2Cr--119 to 150 cm; weathered and fractured metasedimentary siltite bedrock.

TYPE LOCATION: Benewah County, Idaho; southeast of Plummer, about 503 meters north and 573 meters west of the southeast corner of sec. 26, T. 46 N., R. 4 W. Latitude 47 degrees, 17 minutes, 54 seconds North; Longitude 116 degrees, 47 minutes, 48 seconds West; NAD 83; USGS Chatcolet Quadrangle.

RANGE IN CHARACTERISTICS:
Moisture control section - usually dry for 25 to 40 consecutive days August to September, moist mid-September through July
Mean annual soil temperature - 6.0 to 8.0 degrees C.
Mean summer soil temperature - 8.9 to 11.1 degrees C with an O horizon
Depth to paralithic contact - 100 to 150 cm
Volcanic ash mantle*
*Thickness - 36 to 60 cm
*Volcanic glass content - 30 to 50 percent
*Acid-oxalate extractable Al + 1/2 Fe - 0.5 to 2.0 percent
*Phosphate retention - 55 to 70 percent
*15 bar water (air dried) - 7 to 12 percent

A horizon
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture - ashy silt loam
Rock fragments - 0 to 20 percent gravel
Clay content - 5 to 10 percent
Bulk density - 0.65 to 0.90 g/cc
Reaction - 5.8 to 7.3

Bw1, Bw2, Bw3 horizons
Hue - 10YR or 7.5YR
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 3 or 4 dry or moist
Texture - ashy silt loam
Rock fragments - 0 to 20 percent gravel
Clay content - 5 to 10 percent
Bulk density - 0.65 to 0.90 g/cc
Reaction - 5.6 to 7.3

2Bw4 horizon
Hue - 10YR, 7.5YR, or 2.5Y
Value - 6 to 8 dry, 4 to 6 moist
Chroma - 3 or 4 dry or moist
Texture - silt loam or loam
Rock fragments - 15 to 40 percent gravel; 0 to 50 percent cobbles
Clay content - 5 to 15 percent
Reaction - 5.5 to 7.3

2BC horizon
Hue - 10YR, 7.5YR, or 2.5Y
Value - 6 to 8 dry, 4 to 6 moist
Chroma - 3 or 4 dry or moist
Texture - silt loam, loam or fine sandy loam
Rock fragments - 15 to 40 percent gravel; 5 to 45 percent cobbles
Parafragments - 0 to 5 percent paragravel
Clay content - 5 to 15 percent
Reaction 5.5 to 6.5

2C horizon
Hue - 10YR or 2.5Y
Value - 6 to 8 dry, 4 to 6 moist
Chroma - 3 to 6 dry or moist
Texture - loam, silt loam, fine sandy loam or sandy loam
Rock fragments - 10 to 30 percent gravel; 15 to 50 percent cobbles; 0 to 10 percent stones
Parafragments - 0 to 10 percent paragravel
Clay content - 5 to 15 percent
Reaction - 5.1 to 6.5

COMPETING SERIES:
Bouldercreek - are very deep
Boulderjud - loamy-skeletal part of the particle-size control section is dominated by subangular rock fragments of granitic origin
Bulgar - are very deep
Bullroar - are very deep
Deardorf - are moderately deep to a lithic contact
Ferguson - are very deep
Gutridge - are deep to a lithic contact
Honeyjones - are very deep
Stalter - are moderately deep to a paralithic contact
Thorton - are very deep
Threecent - are moderately deep to a lithic contact
Twobit - are moderately deep to a lithic contact

GEOGRAPHIC SETTING:
Landform - mountains
Elevation - 670 to 1,475 meters
Aspect - northerly
Slopes - 5 to 70 percent
Parent material - colluvium over residuum derived from metasedimentary bedrock (predominantly siltite and fine grained quartzite), with a thick mantle of volcanic ash
Mean annual precipitation - 625 to 1,025 mm.
Mean annual air temperature - 5.5 to 7.8 degrees C.
Frost-free period - 90 to 115 days

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Ardenvoir and Saint Maries soils. Ardenvoir soils are loamy-skeletal, do not have a thick volcanic ash mantle, and are on adjacent south aspects of mountains. Saint Maries soils do not have a thick volcanic ash mantle, are very deep, and are on east and west aspects of concave mountain backslopes.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; medium to rapid runoff; moderate saturated hydraulic conductivity.

USE AND VEGETATION: These soils are used for timber production, recreation, wildlife habitat, and watershed. Potential natural overstory vegetation is mainly western red cedar, grand fir, Douglas fir, western white pine, and western larch and with an understory of queencup beadlily, longtube twinflower, starry false Solomons-seal, hooker fairybells, Idaho goldthread, pacific trillium, darkwoods violet, myrtle pachystima, and western rattlesnake plantain.

DISTRIBUTION AND EXTENT: Northern Idaho and possibly eastern Washington; MLRA 43A. This series is of large extent.

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

SERIES ESTABLISHED: Benewah County, Idaho, 2013.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from 0 to 10 cm (Oi, Oe, A horizons)
Cambic horizon - from 10 to 97 cm (Bwl, Bw2, Bw3, 2Bw4, 2BC horizons)
Andic soil properties - from 8 to 48 cm (A, Bwl, Bw2, Bw3 horizons)
Particle-size control section - from 8 to 108 cm (A, Bwl, Bw2, Bw3, 2Bw4, 2BC, part of the 2C horizon)

ADDITIONAL DATA: Laboratory data available for Soil Survey Sample Number: S02ID009-003 Benewah County, Idaho. NSSL Pedon Number: 02N1053

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National Cooperative Soil Survey
U.S.A.