LOCATION HANKS IDEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive Typic Dystrocryepts
TYPICAL PEDON: Hanks gravelly coarse sandy loam--on a 30 percent slope at an elevation of 7,800 feet in forested lands. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 0.3 inch; very dark grayish brown (10YR 3/2) slightly decomposed needles, twigs, and cones; slightly matted; very strongly acid (pH 4.9); abrupt wavy boundary. (0 to 4 inches thick)
A1--0.3 to 1 inch; grayish brown (10YR 5/2), brown (10YR 5/3) crushed coarse sandy loam, very dark grayish brown (10YR 3/2) moist; upper part darker; very weak thin platy and weak very fine granular structure; soft and very friable; many very fine and fine, common medium roots; many very fine interstitial and tubular pores; 14 percent angular gravel, mostly less than 5 mm. across; strongly acid (pH 5.4); clear wavy boundary. (1 to 4 inches thick)
A2--1 to 3 inches; brown (10YR 5/3) gravelly coarse sandy loam, very dark grayish brown (10YR 3/2) moist; weak very fine granular structure; slightly hard and very friable; many very fine and fine and few medium roots; many very fine and fine tubular pores; 18 percent angular gravel, mostly less than 5 mm. across; strongly acid (pH 5.3); clear smooth boundary. (1 to 4 inches thick)
Bw--3 to 11 inches; pale brown (10YR 6/3) gravelly coarse sandy loam, dark brown (10YR 3/3) moist; moderate very fine crumb structure; slightly hard and very friable; common very fine, fine, and medium and few coarse roots; many very fine and fine tubular pores; 20 percent angular gravel, mostly less than 5 mm. across; strongly acid (pH 5.2); gradual irregular boundary. (4 to 10 inches thick)
BC--11 to 27 inches; very pale brown (10YR 7/3) gravelly coarse sandy loam, yellowish brown (10YR 5/4) moist; 40 percent of very pale brown (10YR 7/4), yellowish brown (10YR 5/4) moist; moderate very fine crumb structure; soft and very friable; few very fine and fine roots; common very fine and fine tubular pores; 22 percent angular gravel, mostly less than 5 mm. across; strongly acid (pH 5.5); gradual irregular boundary. (7 to 30 inches thick)
C1--27 to 40 inches; very pale brown (10YR 8/3) and very pale brown (10YR 8/4) gravelly loamy coarse sand, light yellowish brown (10YR 6/4) moist; structureless, massive; soft and very friable; few very fine and fine roots; few very fine and fine tubular pores; 30 percent angular gravel; strongly acid (pH 5.5); clear wavy boundary. (6 to 20 inches thick)
C2--40 to 55 inches; very pale brown (10YR 8/3) gravelly loamy coarse sand; light yellowish brown (10YR 6/4) moist; structureless, massive; soft and very friable; few very fine, fine, medium, and coarse roots; common very fine and fine tubular pores; 25 percent granitic angular gravel; moderately acid (pH 5.6). (0 to 30 inches thick)
TYPE LOCATION: Boise County, Idaho; southwest 1/4, southwest 1/4 of section 21, T. 10 N., R. 6 E.; coordinates from the fiducial center of serial photograph ELD 29-71, 2.8 inches north and 1.8 inches east.
RANGE IN CHARACTERISTICS:
Moisture regime - Udic
Average annual soil temperature - 34 to 39 degrees F.
Average summer soil temperature with no 0 horizon - 49 to 55 degrees F. Weighted average percent coarse fragments in the
control section - 0 to 35 percent
Sola thickness - 20 to 30 inches
Base saturation of profile - 5 to 25 percent
A horizon
Chroma - 2 or 3 dry and moist
Weak or moderate structure
Bw horizon
Hue - 10YR or 7.5YR
Value - 6 or 7 dry, 3,4 or 5 moist
Chroma - 3 or 4 dry and moist
Textures - SL, L, GR-L, GR-COSL
Moderate or weak crumb, granular or subangular blocky structure
C horizon
Textures - LCOS, GR-LCOS, CB-LCOS
COMPETING SERIES: These are Lake Janee, Mccloud, and Smithfha. All of these soils are loamy throughout the particle-size control section. In addition Lake Janee soils have a solum more than 40 inches thick. Mccloud soils have a paralithic contact at 20 to 30 inches. Smithfha soils have an albic horizon.
GEOGRAPHIC SETTING: The soils are in mountains at elevations between 6,000 and 8,000 feet. The areas consist mostly of upper sideslopes, saddles, benches, and ridge crests. Slopes range from about 5 to 65 percent. Most aspects are northerly. The soils are forming in residuum and possibly colluvium derived from granitic and related rocks. The average annual precipitation is 35 to 45 inches and includes 140 to 180 inches of snowfall. The average frost-free period is 20 to 60 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Josie and Whitecap series. The Josie soils have umbric epipedons 10 to 16 inches thick. The Whitecap soils have bedrock at 10 to 20 inches.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained; medium or rapid runoff; and moderately rapid permeability.
USE AND VEGETATION: Used mainly for watershed, grazing, wildlife, recreation, and forestry. The vegetation is mostly pure and mixed stands of subalpine fir and lodgepole pine and some Douglas-fir. The understory includes dwarf and tall huckleberry, mountain ash, currant, twinberry, elk sedge, woodrush, sickletop pedicularis, alumroot, Indian paintbrush, arnica, and lupine.
DISTRIBUTION AND EXTENT: Probably in much of the higher part of the Idaho Batholith. Moderately extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Middle Fork Payette River Area, Boise, and Valley Counties, Idaho, 1969.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon the zone from the soil surface to a depth of 3 inches (O and A horizons);
Cambic horizon - the zone from 3 to 27 inches (Bw and BC horizons).