LOCATION HILDEBRAND ID
Established Series
Rev. ELR-BDG-EMM
06/2013
HILDEBRAND SERIES
The Hildebrand series consists of very deep, moderately well drained soils formed in mixed alluvium with a thin volcanic ash mantle. They are on stream terraces. Saturated hydraulic conductivity is moderately high and slopes range from 2 to 20 percent. The average annual precipitation is about 45 inches and the average annual temperature is about 42 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, active, frigid Andic Hapludalfs
TYPICAL PEDON: Hildebrand ashy silt loam, forested, on a 5 percent slope at 3,240 feet elevation. Aspect is west. When described on October 27, 1999, the soil was moist throughout. (Colors are for dry soil unless otherwise noted).
A--0 to 4 inches; grayish brown (10YR 5/2) ashy silt loam, very dark grayish brown (10YR 3/2) moist; moderate fine granular structure parting to weak fine granular; soft, very friable, non-sticky and non-plastic; many very fine and fine roots; many very fine and fine irregular pores; strongly acid (pH 5.5); abrupt wavy boundary. (A horizon 1 to 9 inches thick).
Bw--4 to 12 inches; yellowish brown (10YR 5/4) ashy silt loam, dark brown (7.5YR 3/4) moist; weak fine and medium granular structure; soft, very friable, non-sticky and non-plastic; many very fine, common fine and few medium roots; many very fine and fine irregular pores; strongly acid (pH 5.4); clear wavy boundary. (Bw horizons 0 to 12 inches thick).
2Bt1--12 to 25 inches; pale brown (10YR 6/3) silt loam, dark yellowish brown (10YR 3/4) moist; few, fine faint redox concentrations; moderate medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common very fine and fine roots along ped faces; common very fine irregular and few fine tubular pores; few, faint clay films on ped faces; strongly acid (pH 5.5); clear wavy boundary.
2Bt2--25 to 36 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; common fine distinct dark yellowish brown (10YR 4/6) moist and few medium distinct dark yellowish brown (10YR 4/6) moist redox concentrations; moderate fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; common very fine and fine roots along ped faces; common very fine irregular and few fine tubular pores; common, faint, dark brown (10YR 3/3) clay films on ped faces; strongly acid (pH 5.3); clear wavy boundary.
2Bt3--36 to 40 inches; pale brown (10YR 6/3) loam, brown (10YR 4/3) moist; many fine and medium distinct dark yellowish brown (10YR 4/6) moist and few coarse distinct dark yellowish brown (10YR 4/6) moist redox concentrations; moderate fine and medium subangular blocky structure; soft, friable, slightly sticky and slightly plastic; few very fine and fine roots along ped faces; common very fine irregular and few fine tubular pores; few fine clay films in pores; strongly acid (pH 5.4); clear wavy boundary. (2Bt horizons 21 to 51 inches thick).
2C1--40 to 45 inches; light yellowish brown (10YR 6/4) silt loam, yellowish brown (10YR 5/4) moist; many fine and medium distinct dark yellowish brown (10YR 4/6) moist and common coarse distinct dark yellowish brown (10YR 4/6) moist redox concentrations; massive; soft, friable, slightly sticky and slightly plastic; few very fine roots along ped faces; common very fine irregular pores; strongly acid (pH 5.5); clear wavy boundary. (0 to 11 inches thick)
2C2--45 to 60 inches; light yellowish brown (10YR 6/4) silt loam, yellowish brown (10YR 5/4) moist; many fine to coarse distinct dark yellowish brown (10YR 4/6) moist redox concentrations; massive; soft, friable, slightly sticky and slightly plastic; few very fine roots along ped faces; common very fine irregular pores; moderately acid (pH 5.6).
TYPE LOCATION: Clearwater County, Idaho; about 11 miles southeast of Elk River, Idaho; about 800 feet north and 400 feet west of the southeast corner of sec. 33, T. 39 N., R. 3 E.; Latitude 46 degrees, 40 minutes, 33 seconds North; Longitude - 116 degrees, 06 minutes, 04 seconds West. USGS Little Green Mountain Quadrangle.
RANGE IN CHARACTERISTICS:
Average annual soil temperature - 39 to 45 degrees F (Frigid temperature regime).
Soil moisture control section - usually moist year around and not dry for 45 consecutive days during June to October (Udic moisture regime).
Thickness of volcanic ash - 8 to 13 inches.
Volcanic glass content in the 0.02 to 2.0 mm fraction- 7 to 26 percent
Acid-oxalate Al plus 1/2 Fe - 1.2 to 2.25 percent
Phosphate retention - 60 to 90 percent
15-bar water retention on air dried samples - 8.5 to 12.7 percent
A horizon:
Hue - 10YR or 7.5YR moist
Value - 4 or 5 dry and 3 or 4 moist
Chroma - 2 to 4 dry and 2 or 3 moist
Clay content - 8 to 10 percent
Rock fragments - 0 to 2 percent gravel
Reaction - 5.8 to 6.8
Bulk density - 0.60 to 0.95 g/cm3
Bw horizons:
Hue - 10YR or 7.5YR dry and moist
Value - 5 or 6 dry and 3 or 4 moist
Clay content - 8 to 10 percent
Rock fragments - 0 to 2 percent gravel
Reaction - 5.6 to 6.8
Bulk density - 0.60 to 0.95 g/cm3
2Bt horizons:
Hue - 10YR or 7.5YR moist
Value - 6 or 7 dry and 3 to 6 moist
Chroma - 2 to 4 dry and 2 to 6 moist
Texture - silt loam, loam or silty clay loam
Clay content - 7 to 35 percent (weighted average greater than 18 percent in upper 20 inches)
Rock fragments - 0 to 5 percent gravel
Reaction - 5.1 to 6.0
2C horizons:
Hue - 10YR or 2.5Y dry or moist
Value - 5 to 8 dry and 4 to 6 moist
Chroma - 3 to 6 dry and moist
Textures - loam, silt loam, sandy loam, loamy sand
Clay content - 5 to 21 percent
Rock fragments - 0 to 20 percent gravel
Reaction - 5.1 to 6.0
COMPETING SERIES:
Jaype: lacks redox concentrations within 150cm of surface
Konkol: lacks redox concentrations within 150cm of surface
GEOGRAPHIC SETTING: Hildebrand soils are on stream terraces at elevations of 2,660 to 3,565 feet (810 to 1087 meters) with slopes of 2 to 20 percent. These soils are formed in mixed alluvium with a thin volcanic ash mantle. The average annual temperature is 38 to 44 degrees F. and the average precipitation is 30 to 45 inches. The frost-free season is 50 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are
Brequito,
Grangemont,
Grasshopper,
Kauder,
Mushel,
Norwidge,
Spacecreek and
Teneb series. Brequito soils are on mountain sideslopes and are well drained. Grangemont soils are on plateau hills and benches, are well drained and have fragic characteristics. Grasshopper soils are on floodplains and are somewhat poorly drained. Kauder soils are on hills and plateaus and have a fragipan. Mushel soils are on mountain sideslopes and are well drained. Norwidge soils are on hills and plateaus, are well drained and have fragic characteristics. Teneb soils are on floodplains and drainageways and are poorly drained.
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained, moderately high saturated hydraulic conductivity. Average depth to an apparent water table is 30 to 40 inches from January to May and 40 to greater than 60 inches from May to December.
USE AND VEGETATION: These soils are used for timber production, livestock grazing, wildlife habitat, watershed, and recreation. Potential natural vegetation is western red cedar, grand fir, western larch, Douglas-fir, Engleman spruce and lodgepole pine, with an understory of wild ginger, queencup beadlily, coolwort foamflower, goldthread, poineer violet, and huckleberry.
DISTRIBUTION AND EXTENT: North Central Idaho, Hildebrand soils are not extensive; about 2,100 acres.
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 mineral soil surface to 4 inches (A horizon).
Cambic horizon - The zone from 4 to 12 inches (Bw horizon).
Volcanic ash cap - The zone from the mineral soil surface to 12 inches (A and Bw horizons).
Argillic horizon - The zone from 12 to 40 inches (2Bt horizons).
Particle size control section - The zone from 12 to 32 inches (2Bt1, and portions of the 2Bt2 horizons).
Ranges in the "Range in Characteristics" section for volcanic glass content, acid-oxalate, phosphate retention, 15 bar water retention and bulk density are estimates only.
National Cooperative Soil Survey
U.S.A.