LOCATION CAMPRA                  ID

Established Series
Rev. BG-BDG-EMM
06/2013

CAMPRA SERIES

The Campra series consists of very deep, well drained, moderately slowly permeable soils that formed in material weathered from basalt with a mantle of loess and minor amounts of volcanic ash. They are on canyon side slopes, short escarpments, hills and mountain slopes. Slopes are 10 to 75 percent. The average annual precipitation is about 30 inches. The average annual temperature is about 43 degrees F.

TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Vitrandic Hapludalfs

TYPICAL PEDON: Campra gravelly ashy silt loam, forested on a 32 percent slope with a northwest aspect at 1800 feet elevation. The profile was dry throughout when described on July 20, 1993. (Colors are for dry soil unless otherwise noted.)

Oi--0 to 3 inches; organic mat of slightly decomposed moss, leaves, needles and twigs. (0.5 to 3 inches thick)

A--3 to 7 inches; brown (10YR 4/3) gravelly ashy silt loam, dark brown (10YR 3/3) moist; moderate very fine and fine granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine and common medium roots throughout; many very fine and fine irregular pores; 25 percent subangular basalt gravel; neutral (pH 7.3); clear wavy boundary. (2 to 6 inches thick)

AB--7 to 14 inches; brown (10YR 5/3) very gravelly ashy silt loam, brown (10YR 4/3) moist; weak very fine and fine granular and weak fine and medium subangular blocky structure; soft, very friable, slightly sticky and slightly plastic; common very fine and fine roots throughout; many very fine and fine irregular pores; 30 percent subangular basalt gravel and 10 percent subangular basalt cobbles; neutral (pH 7.2); clear wavy boundary. (0 to 12 inches thick)

E/Bt--14 to 20 inches; 75 percent E - pale brown (10YR 6/3) very gravelly silt loam, brown (10YR 4/3) moist; 25 percent B - brown (10YR 5/3) very gravelly silt loam, brown (10YR 4/3) moist; moderate fine and medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine roots between faces of peds; common very fine and fine irregular and few very fine tubular pores; few patchy faint clay films in pores; 40 percent subangular basalt gravel and 15 percent subangular basalt cobbles; neutral (pH 6.8); abrupt wavy boundary. (0 to 6 inches thick)

Bt/E1--20 to 33 inches; 75 percent B - yellowish brown (10YR 5/4) extremely cobbly silt loam, dark yellowish brown (10YR 3/4) moist; 25 percent E - pale brown (10YR 6/3) extremely cobbly silt loam, dark yellowish brown (10YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common very fine and fine roots along faces of peds; common very fine and fine irregular and few very fine tubular pores; few patchy faint clay films on faces of peds; 15 percent subangular basalt gravel, 50 percent subangular basalt cobbles, and 10 percent subangular basalt stones; neutral (pH 6.6); abrupt wavy boundary. (3 to 13 inches thick)

Bt/E2--33 to 49 inches; 85 percent B - dark yellowish brown (10YR 4/6) extremely gravelly silt loam, dark yellowish brown (10YR 4/4) moist; 15 percent E - pale brown (10YR 6/3) extremely gravelly silt loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; common very fine and fine roots along faces of peds; common very fine and fine irregular and few very fine tubular pores; common discontinuous prominent pale brown (10YR 6/3) skeletans on faces of peds and in pores; common discontinuous distinct strong brown (7.5YR 4/6) clay films on faces of peds; 1 percent fine mica flakes; 70 percent subangular basalt gravel and 5 percent subangular basalt cobbles; slightly acid (pH 6.5); clear wavy boundary. (8 to 16 inches thick)

Bt/E3--49 to 61 inches; 85 percent B - brown (10YR 4/3) extremely gravelly silt loam, dark brown (10YR 3/3) moist; 15 percent E - pale brown (10YR 6/3) extremely gravelly silt loam, brown (10YR 4/3) moist; moderate fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine roots along faces of peds; common very fine and fine tubular and few very fine irregular pores; common discontinuous distinct light yellowish brown (10YR 6/4) clay films on faces of peds and on rock fragments; 1 percent fine mica flakes; 60 percent subangular basalt gravel and 5 percent subangular basalt cobbles; slightly acid (pH 6.1); abrupt wavy boundary. (0 to 24 inches thick)

Bt/E4--61 to 67 inches; 85 percent B - brown (10YR 4/3) very gravelly clay loam, dark brown (10YR 3/3) moist; 15 percent E - pale brown (10YR 6/3) very gravelly clay loam, brown (10YR 4/3) moist; strong medium and coarse subangular blocky structure; hard, firm, moderately sticky and moderately plastic; few fine and medium roots along faces of peds; few very fine tubular pores; common discontinuous prominent very pale brown (10YR 8/2) skeletans in root channels and pores; many continuous prominent brown (10YR 4/3) clay films on faces of peds and in pores; 1 percent fine mica flakes; 35 percent subangular basalt gravel; moderately acid (pH 6.0).

TYPE LOCATION: Clearwater County, Idaho; about 3.4 miles east and 1.1 miles south of Orofino, Idaho; about 1,450 feet south and 1,750 feet east of the northwest corner of sec. 14, T.36N., R.2E.; Latitude - 46 degrees, 28 minutes, 00 seconds North; Longitude - 116 degrees, 10 minutes, 22 seconds West; USGS Orofino East Quadrangle.

RANGE IN CHARACTERISTICS:

Soil moisture control section - usually moist and not dry for 45 consecutive days between June and October. Udic moisture regime.
Average annual soil temperature - 39 to 45 degrees F. Frigid temperature regime.
Weighted average rock fragment content in the particle-size control section is greater than 35 percent.

Present in some pedons - Bt horizons

A horizon
Hue - 10YR or 7.5YR
Value - 4 or 5 dry, 2 or 3 moist
Chroma - 2 or 3 dry or moist
Texture - ashy silt loam or ashy loam
Clay content - 16 to 26 percent
Rock fragments - 0 to 25 percent gravel, 0 to 20 percent cobbles, 0 to 10 percent stones; 0 to 30 percent total rock fragments
Volcanic glass content - 5 to 15 percent
Acid-oxalate extractable Al plus 1/2 Fe - 0.4 to 1.13
Reaction - slightly acid or neutral

AB or BA horizons
Hue - 10YR or 7.5YR moist
Value - 3 or 4 moist
Chroma - 3 or 4 moist
Texture - ashy silt loam
Clay content - 15 to 23 percent
Rock fragments - 2 to 30 percent gravel, 0 to 15 percent cobbles, 2 to 45 percent total rock fragments
Volcanic glass content - 5 to 15 percent
Acid-oxalate extractable Al plus 1/2 Fe - 0.4 to 1.13
Reaction - slightly acid or neutral

Bw horizon (present in some pedons)
Hue - 10YR or 7.5YR moist
Texture - silt loam
Clay content - 15 to 25 percent
Rock fragments - 2 to 25 percent gravel, 0 to 5 percent cobbles, 2 to 35 percent total rock fragments
Reaction - slightly acid

E/Bt horizon
Texture - silt loam or loam
Clay content - 21 to 26 percent
Rock fragments - 20 to 40 percent gravel, 0 to 15 percent cobbles
Reaction - slightly acid or neutral

Bt/E horizons
B part
Hue - 10YR or 7.5YR
Value - 4 to 6 dry, 3 or 4 moist
Chroma - 3 to 6 dry, 3 or 4 moist
E part
Value - 5 or 6 dry
Chroma - 3 or 4 moist
Texture - silt loam, silty clay loam or clay loam
Clay content - 15 to 35 percent in the upper part and 21 to 45 percent in the lower part
Rock fragments - 0 to 80 percent gravel, 5 to 55 percent cobbles and 0 to 40 percent stones, 25 to 90 percent total rock fragments
Reaction - strongly acid to neutral

COMPETING SERIES:

Shayhill: does not have E/Bt or Bt/E horizons

GEOGRAPHIC SETTING: Campra soils are on canyonsides, short escarpments, hills and mountain slopes at elevations of 1,100 to 3,400 feet (335 to 1036 meters). Slopes are 10 to 75 percent. These soils are formed in material weathered from basalt with a mantle of loess and minor amounts of volcanic ash. The average annual temperature is 38 to 46 degrees F. The average annual precipitation is 22 to 45 inches (559 to 1143 mm) and the frost free period is 50 to 120 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Agatha, Elkridge, Kettenbach, Klickson and Sly series. Agatha, Kettenbach and Klickson soils are on canyonsides and have a xeric moisture regime. Elkridge soils are on canyonsides and footslopes and have a thin mantle of volcanic ash. Sly soils are on slump block benches and have less than 35 percent rock fragments.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; moderately high saturated hydraulic conductivity

USE AND VEGETATION: These soils are used primarily for timber production, livestock grazing, wildlife habitat and watershed. The natural vegetation is mainly grand fir, Douglas fir and ponderosa pine with an understory of queencup beadlilly, goldthread, American trailplant, longtube twinflower, creambush oceanspray and mallow ninebark.

DISTRIBUTION AND EXTENT: Northcentral Idaho. Campra soils are not extensive; about 7,000 acres. MLRA 43A and 9.

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 the 3 to 14 inches. (A and AB horizons)

Argillic horizon - the zone from 20 to 67 inches. (Bt/E horizons)

Particle size control section - the zone from 20 to 40 inches. (Bt/E1 and a portion of the Bt/E2 horizons)

The ranges in values listed under the A and AB horizons for Volcanic glass content and Acid-oxalate extractable Al plus 1/2 Fe are estimates only.

ADDITIONAL DATA: Laboratory data: Soil Survey Sample No. S93ID-035-003 (project no. 94P 39, pedon no. 94P 188) Clearwater County, Idaho by NSSL, Lincoln, NE.

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National Cooperative Soil Survey
U.S.A.