LOCATION STAVELY ID+OREstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, frigid Typic Haploxerepts
TYPICAL PEDON: Stavely coarse sandy loam, on a 24 percent north west-facing slope at 5,360 feet elevation. Vegetation is Douglas fir. When described on September 9, 1985, the profile was slightly moist throughout. (Colors are for dry soil unless otherwise noted.)
Oi--0 to 1 inch; partially decomposed fir needles, twigs, and leaves.
A--1 to 5 inches; dark grayish brown (10YR 4/2) coarse sandy loam, very dark brown (10YR 2/2) moist; weak fine granular structure; soft, very friable; common fine roots; 5 percent fine gravel; neutral (pH 6.6); abrupt smooth boundary. (2 to 5 inches thick)
AB--5 to 11 inches; pale brown (10YR 6/3) coarse sandy loam, dark brown (10YR 3/3) moist; weak fine subangular blocky structure; slightly hard, very friable; common fine roots; 5 percent fine gravel; neutral (pH 6.8); clear smooth boundary. (0 to 7 inches thick)
Bw1--11 to 18 inches; pale brown (10YR 6/3) coarse sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, friable; common fine, medium and coarse roots; 10 percent fine gravel; neutral (pH 6.7); clear smooth boundary.
Bw2--18 to 29 inches; very pale brown (10YR 7/3) gravelly coarse sandy loam, brown (10YR 4/3) moist; weak medium subangular blocky structure; slightly hard, friable; few fine roots; 20 percent fine gravel; neutral (pH 6.7); clear smooth boundary. (combined thickness of the Bw horizon is 8 to 22 inches)
BC--29 to 35 inches; very pale brown (10YR 7/3) fine gravelly loamy coarse sand, brown (10YR 5/3) moist; massive; hard, friable; few fine roots; 25 percent fine gravel; neutral (pH 6.6); gradual wavy boundary. (4 to 8 inches thick)
C1--35 to 43 inches; variegated very gravelly coarse sand; massive; hard, friable; few fine roots; 35 percent gravel; slightly acid (pH 6.4); gradual wavy boundary. (6 to 20 inches thick)
C2--43 to 61 inches; variegated very gravelly coarse sand; massive; hard, friable; 25 percent granodiorite cobbles and stones that are slightly hard, highly weathered and break down into gravelly coarse sand; matrix is very gravelly coarse sand with 40 percent gravel; few fine roots; slightly acid (pH 6.5).
TYPE LOCATION: Elmore County, Idaho; about 3 miles southeast of Pine and 2 miles north of Lester Creek Guard Station; about 550 feet north and 300 feet east of the southwest corner section 26, T. 2 N., R. 9 E.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 42 to 47 degrees F.
Reaction in the profile - slightly acid to neutral
Percent rock fragments in the control section - 5 to 30 percent (weighted average)
A horizon
Value- 4 through 6 dry, 2 through 5 moist
Chroma, dry and moist - 2 through 4
Bw horizon
Value- 6 or 7 dry, 3 through 5 moist
Chroma, dry and moist - 2 through 4
Texture - COSL, FGR-COSL, SL
Clay content - 10 to 15 percent
Base saturation - 75 to 85 percent
C horizon
Value- 7 or 8 dry, 5 or 6 moist
Chroma, dry and moist - 3 through 6
Percent rock fragments - 15 to 50
Texture - GR-LCOS, GRV-LCOS, GRV-COS
COMPETING SERIES: These are the Backswitch (T), Bouldrock, Selon and Snowshoe series. Backswitch soils have a paralithic contact over a lithic contact at a depth of 20 to 40 inches. Selon soils have an E/Bw horizon and a particle-size control section dominated with subrounded rock fragments of alluvial origin. Snowshoe soils lack rock fragments in the series control section and have loam or fine sandy loam textures in the upper 25 to 30 inches with the particle-size control sedtion averaging a fine sandy loam texture.
GEOGRAPHIC SETTING: Stavely soils are generally on forested mountain slopes at elevations of 4,000 to 6,200 feet. Slopes are 10 to 60 percent. The soils formed in material weathered from intermediate intrusive igneous rocks. The average annual precipitation is 20 to 30 inches. The average annual temperature is 40 to 45 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Broad Canyon, Coski, Grousecreek, and the competing competing Backswitch series. Broadcanyon and Coski soils have a mollic epipedon and cryic temperature regime. Grousecreek soils are skeletal and have a mollic epipedon. Broad Canyon andCoski soils are on steep north aspects. Backswitch and Grousecreek soils are on similar positions as Stavely soils.
DRAINAGE AND PERMEABILITY: Well drained; runoff is medium to rapid; moderately rapid permeability.
USE AND VEGETATION: Stavely soils are used for timber production, wildlife habitat, grazing, recreation, and watershed. The natural vegetation is a mixed stand of ponderosa pine and Douglas-fir.
Understory vegetation consists of mountain snowberry, chokecherry, serviceberry, snowbrush, and elk sedge.
DISTRIBUTION AND EXTENT: Southern part of the Idaho Batholith. Stavely soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Elmore County Area, Idaho, 1986.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Orchic epipedon - the zone from 1 to 5 inches (A horizon)
Cambic horizon - the zone from 11 to 29 inches (Bw horizon)
Particle-size control section - the zone from 11 to 41 inches with a weighted average of 22 percent gravel.
Classification revised 11/02 from Dystroxerepts to Haploxerepts based on base saturation as noted in range of characteristics in addition to supporting lab data for modal pedon.
ADDITIONAL DATA: Laboratory data is available for this pedon; sample # S79ID-039-004; NSSL; Lincoln, NE