LOCATION KINGSPEAK               ID

Established Series
Rev. SHB/RWL/EMM
10/2013

KINGSPEAK SERIES

The Kingspeak series consists of very deep, well drained soils on hills and structural benches. They formed in mixed alluvium and lacustrine sediments with a mixed mantle of reworked loess and volcanic ash. Slopes range from 3 to 35 percent. The average annual air temperature is about 43 degrees F. and the average annual precipitation is about 29 inches.

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

TYPICAL PEDON: Kingspeak ashy silt loam, forest; on a northeast-facing slope of 18 percent at 2,240 feet elevation. When described on September 10, 2003, the soil was slightly moist throughout. (Colors are for dry soil unless otherwise noted.)

Oi--0 to 1 inch; slightly decomposed needles, leaves, twigs, bark and cones. (1 to 1.5 inches thick)

Oe--1 to 2 inches; moderately decomposed organic matter mixed with 1980 Mt. St. Helens volcanic ash. (0.5 to 1.5 inches thick)

A--2 to 3 inches; light brownish gray (10YR 6/2) ashy silt loam, dark grayish brown (10YR 4/2) moist; moderate very fine and fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many very fine and fine, and common medium and coarse roots; many very fine and fine and few medium tubular pores; 1 percent gravel; slightly acid (pH 6.5); abrupt wavy boundary. (1 to 3 inches thick)

Bw--3 to 10 inches; very pale brown (10YR 7/3) ashy silt loam, brown (10YR 4/3) moist; weak fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine, and common medium and coarse roots; many very fine and fine, and few medium and coarse tubular pores; 1 percent gravel; slightly acid (pH 6.5); clear wavy boundary. (4 to 7 inches thick)

E/Bt1--10 to 20 inches; (E part, 80 percent) pale yellow (2.5Y 7/3) silt loam, light olive brown (2.5Y 5/3) moist; (B part, 20 percent) light yellowish brown (10YR 6/4) silt loam, dark yellowish brown (10YR 4/4) moist; weak coarse platy structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, and few medium and coarse roots; many very fine and fine, common medium, and few coarse tubular pores; few faint clay films bridging sand grains; 1 percent very fine mica flakes; 2 percent gravel; slightly acid (pH 6.5); gradual wavy boundary. (0 to 10 inches thick)

E/Bt2--20 to 24 inches; (E part, 60 percent) pale yellow (2.5Y 7/3) silt loam, light olive brown (2.5Y 5/3) moist; (B part, 40 percent) light yellowish brown (10YR 6/4) silt loam, dark yellowish brown (10YR 4/4) moist; weak very coarse and coarse platy structure; hard, friable, slightly sticky and slightly plastic; common very fine and fine, and few medium and coarse roots; many very fine and fine, common medium, and few coarse tubular pores; few faint clay films on plate surfaces and lining pores; common yellowish brown (10YR 5/4) and strong brown (7.5YR 4/6) lamellae 1/16 to inch thick; few distinct light gray (2.5Y 7/2) silt coats on ped faces; 1 percent very fine mica flakes; 2 percent gravel; slightly acid (pH 6.2); clear wavy boundary. (4 to 8 inches thick)

E/Bt3--24 to 30 inches; (E part, 55 percent) pale yellow (2.5Y 7/3) silt loam, brown (10YR 5/3) moist, (B part, 45 percent) light yellowish brown (10YR 6/4) silt loam, dark yellowish brown (10YR 4/4) moist; weak coarse prismatic structure; hard, friable, slightly sticky and slightly plastic; few very fine, fine, medium and coarse roots; many very fine and fine, common medium, and few coarse tubular pores; common faint clay films on ped faces and lining pores, many strong brown (7.5YR 4/6) and yellowish brown (10YR 5/4) lamellae 1/16 to 1/2 inch thick; few distinct light gray (2.5Y 7/2) silt coats on ped faces; 1 percent very fine mica flakes; 5 percent gravel, 5 percent cobbles; slightly acid, pH (6.3); gradual wavy boundary. (5 to 9 inches thick)

Bt/E1--30 to 48 inches; (B part, 75 percent) very pale brown (10YR 7/4) silt loam, yellowish brown (10YR 5/4) moist; (E part, 25 percent) pale yellow (2.5Y 7/3) silt loam, light olive brown (2.5Y 5/3) moist, moderate coarse prismatic structure; hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; many very fine and fine, few medium and coarse tubular pores; common faint and distinct dark yellowish brown (10YR 4/4) and strong brown (7.5YR 4/6) clay films on ped faces and along pores; many strong brown (7.5YR 4/6) and light brown (7.5YR 6/4) lamellae 1/16 to 1 inch thick; few distinct light gray (2.5Y 7/2) silt coats on ped faces; few, fine iron-manganese masses; 1 percent very fine mica flakes; 3 percent gravel; slightly acid (pH 6.3); gradual wavy boundary. (10 to 20 inches thick)

Bt/E2--48 to 55 inches; (B part, 80 percent) yellow (10YR 7/6) silt loam, yellowish brown (10YR 5/6) moist; (E part, 20 percent) pale yellow (2.5Y 7/3) silt loam, light olive brown (2.5Y 5/3) moist, weak coarse prismatic structure; hard, friable, slightly sticky and slightly plastic; few very fine, fine and medium roots; many very fine and fine, and few medium and coarse tubular pores; common distinct and few prominent dark yellowish brown (10YR 4/4) and strong brown (7.5YR 4/6) clay films on ped faces and along pores; common strong brown (7.5YR 4/6) and light brown (7.5YR 6/4) lamellae 1/8 to 3/4 inch thick; common distinct light gray (2.5Y 7/2) silt coats on ped faces; few, fine iron-manganese masses; 1 percent very fine mica flakes; 1 percent gravel; slightly acid (pH 6.3); gradual wavy boundary. (5 to 10 inches thick)

Bt/E3--55 to 60 inches; (B part, 80 percent) yellow (10YR 7/6) silt loam, yellowish brown (10YR 5/6) moist; (E part, 20 percent) pale yellow (2.5Y 7/3) silt loam, light olive brown (2.5Y 5/3) moist, weak medium and coarse platy structure; hard, friable, slightly sticky and slightly plastic; few very fine and fine roots; many very fine and fine, and few medium and coarse tubular pores; common distinct and few prominent dark yellowish brown (10YR 4/4) and strong brown (7.5YR 4/6) clay films on ped faces and along pores; common strong brown (7.5YR 4/6) and yellowish brown (10YR 5/4) lamellae 1/8 to 1/2 inch thick; common distinct light gray (2.5Y 7/2) silt coats on ped faces; few, fine iron-manganese masses; 1 percent very fine mica flakes; 10 percent gravel; slightly acid (pH 6.3). (5 to 10 inches thick)

TYPE LOCATION: Benewah County, Idaho; about 4 miles northeast of Plummer ID, about 2,500 feet north and 470 feet east of the southwest corner of section 1, T. 46 N., R. 4 W., USGS Chatcolet quadrangle
Latitude 47 degrees, 21 minutes, 31.4 seconds N. and Longitude 116 degrees, 47 minutes, 15.7 seconds W.; NAD 83.

RANGE IN CHARACTERISTICS:
(Depth to diagnostic horizons and features are measured from the top of the first mineral layer.)
Mean annual soil temperature - 42 to 46 degrees F
Mean summer soil temperature - 47 to 52 degrees F. with an O horizon
Soil moisture - dry for 20 to 30 consecutive days in mid August to September, moist from mid-September through July; udic soil moisture regime
Clay content - averages 12 to 18 percent
Rock fragments - subangular to well rounded (quartzite, metasedimentary and basalt)

Volcanic ash influence - 7 to 10 inches thick
Volcanic glass content - 5 to 10 percent
Acid - oxalate extr. Al+1/2 Fe - 0.4 to 1.0 percent
Moist bulk density - 1.0 to 1.2 g/cc
Phosphate retention - 25 to 30 percent

A horizon
Value - 3 or 4 moist and 5 or 6 dry
Chroma - 2 or 3 dry or moist
Gravel content - 0 to 5 percent
Clay content - 5 to 15 percent
Reaction - slightly acid or neutral

Bw horizon (BE in some pedons)
Value - 6 or 7 dry
Chroma - 3 or 4 dry or moist
Texture - ashy silt loam
Gravel content - 0 to 5 percent
Clay content - 5 to 15 percent
Reaction - slightly acid or neutral

E/Bt horizon
E part
Hue - 2.5Y or 10YR
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 3 or 4 dry or moist
Clay content - 5 to 15 percent
Bt part
Hue - 10YR or 2.5Y
Value - 5 or 6 dry, 4 or 5 moist
Chroma - 3 or 4 dry or moist
Clay content - 10 to 18 percent
Texture - silt loam Gravel content - 0 to 10 percent
Cobble content - 0 to 10 percent
Total rock fragment content - 0 to 20 percent
Lamellae - none to many, 1/16 to 1/2 inch thick
Reaction - moderately acid to neutral

Bt/E horizon
Bt part
Hue - 10YR or 2.5Y
Value - 4 or 5 moist
Chroma - 3 to 6 dry or moist
E part
Hue - 2.5Y or 10YR
Value - 7 or 8 dry, 5 or 6 moist
Chroma - 3 to 6 dry or moist
Clay content - 10 to 15 percent
Texture - silt loam, loam
Lamellae - few to many, 1/16 to 1 1/4 inches thick
Gravel content - 0 to 10 percent
Cobble content - 0 to 10 percent
Total rock fragment content - 0 to 20 percent
Clay content - 12 to 20 percent
Reaction - moderately acid or slightly acid

Bt or Btx horizon - present in some pedons
Hue - 2.5Y or 10YR
Value - 5 to 7 dry, 4 or 5 moist
Chroma - 3 to 6 dry and moist
Texture - silt loam, silty clay loam
Lamellae - few to many; 1/16 to 3/4 inch thick; 7.5YR 4/6, 10YR 5/4, 5/6
Gravel content - 0 to 10 percent
Cobble content - 0 to 10 percent
Total rock fragment content - 0 to 20 percent
Clay content - 12 to 30 percent
Reaction - strongly acid to slightly acid

COMPETING SERIES: There are no competing series.

GEOGRAPHIC SETTING: The Kingspeak soils are on hills and structural benches. Slope ranges from 3 to 35 percent. They formed in mixed alluvium and lacustrine sediments with a mixed mantle of reworked loess and volcanic ash. Elevations are 2,200 to 2,600 feet. The climate is characterized by cool moist winters and warm dry summers. The mean annual precipitation is 28 to 30 inches. The mean annual air temperature is 41 to 45 degrees F. The frost-free period is 90 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Agatha, Blinn, Dorb and Shayhill soils. Agatha soils are on east aspects of benches, escarpments, and canyonsides and are deep to a lithic contact. Blinn soils are on west aspects of escarpments, are moderately deep to a lithic contact, and contain more than 35 percent rock fragments in the particle-size control section. Dorb soils are on north aspects of terrace escarpments and canyonsides, have a thick mantle of volcanic ash with greater than 35 percent rock fragments, and are deep to a lithic contact. Shayhill soils are on north aspects of escarpment toeslopes and contain greater than 35 percent rock fragments in the particle-size control section.

DRAINAGE AND PERMEABILITY: Well drained. Runoff is medium to high. Saturated hydraulic conductivity is moderately high.

USE AND VEGETATION: These soils are used for homesites, timber production, recreation, water supply, and wildlife habitat. Potential natural overstory vegetation is western hemlock, western redcedar, grand fir, Douglas-fir, western white pine, ponderosa pine, and western larch with an understory of huckleberry, queencup beadlily, starry false Solomon's seal, Idaho goldthread, longtube twinflower, sweetscented bedstraw, American trailplant, rose, Ross' sedge, and western meadowrue.

DISTRIBUTION AND EXTENT: Northern Idaho. MLRA 43A, 44A. The series is of small 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 include:
Ochric epipedon - the zone from 0 to 3 inches (Oi, Oe and A horizons)
Cambic horizon - the zone from 3 to 10 inches (Bw horizon)
Argillic horizon - the zone from 20 to 60 inches (E/Bt2, E/Bt3, Bt/E1, Bt/E2 and Bt/E3 horizons)
Vitrandic feature - the zone from 2 to 10 inches (A and Bw horizons)
Particle-size control section - the zone from 20 to 40 inches (E/Bt2, E/Bt3, and part of the Bt/E1 horizon)

Further clarification is needed as to the depth of a perched water table and if an oxyaquic subgroup feature would apply.

ADDITIONAL DATA: Laboratory data available for Soil Survey Sample Number: S04ID-009-005 Benewah County, Idaho. NSSL Pedon Number: 04N1107.

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National Cooperative Soil Survey
U.S.A.