LOCATION REGGEAR IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, frigid Vitrandic Fragiudalfs
TYPICAL PEDON: Reggear ashy silt loam, forest, on a northerly convex slope of 3 percent at 3,130 feet elevation. When described on September 1983, the soil was moist above 11 inches and dry below. (Colors are for dry soil unless otherwise stated.)
Oi--0 to 2 inches; undecomposed leaves, needles, and twigs; some partially decomposed litter. (0 to 2 inches thick)
A--2 to 8 inches; brown (7.5YR 5/4) ashy silt loam, dark brown (7.5YR 3/4) moist; moderate fine and medium subangular blocky structure parting to strong fine granular; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, medium, and coarse roots; many very fine and fine tubular pores; slightly acid (pH 6.5); clear smooth boundary. (1 to 9 inches thick)
Bw--8 to 13 inches; brown (7.5YR 5/4) ashy silt loam, brown (7.5YR 4/4) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, medium, and coarse roots; many very fine, common fine, and few medium tubular pores; neutral (pH 6.8); abrupt wavy boundary. (0 to 12 inches thick)
2E--13 to 22 inches; light gray (10YR 7/2) silt loam, yellowish brown (10YR 5/4) moist; weak fine and medium prismatic structure parting to weak medium subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; many very fine, fine, and medium and common coarse roots; many very fine and common fine tubular pores; 5 percent of horizon has continuous faint clay films on vertical faces of peds; slightly acid (pH 6.4); clear wavy boundary. (0 to 17 inches thick)
2B/E--22 to 31 inches; B material: light yellowish brown (10YR 6/4) silt loam, dark yellowish brown (10YR 4/4) moist; E material: light gray (10YR 7/2) silt loam, yellowish brown (10YR 5/4) moist; moderate medium prismatic structure parting to moderate medium subangular blocky; hard, firm, moderately sticky and moderately plastic; many very fine, common fine, and few medium roots; many very fine and fine, few medium tubular pores; continuous prominent clay films lining pores and continuous distinct clay films on faces of peds; thick coats of E material on 60 percent of faces of peds; moderately acid (pH 5.8); abrupt wavy boundary. (0 to 20 inches thick)
2Btx1--31 to 41 inches; very pale brown (10YR 7/4) silt loam, dark yellowish brown (10YR 4/4) moist; moderate coarse prismatic structure parting to moderate medium and coarse subangular blocky; very hard, very firm and brittle, moderately sticky and moderately plastic; roots flattened on faces of peds; many very fine and fine, common medium vesicular and tubular pores; continuous prominent clay films lining pores and continuous distinct clay films on faces of peds; few fine dark organic stains on faces of peds; iron stains on faces of peds between E and B material; E material coatings on faces of prisms; tongues of E material 0.10 to 0.75 inch thick between prisms; very strongly acid (pH 5.0); clear smooth boundary. (6 to 17 inches thick)
2Btx2--41 to 60 inches; light yellowish brown (10YR 6/4) silt loam, dark yellowish brown (10YR 4/4) moist; weak coarse prismatic structure parting to weak coarse subangular blocky; extremely hard, extremely firm, and brittle; slightly sticky and slightly plastic; many very fine and fine, and few medium tubular and vesicular pores; continuous distinct clay films lining pores, continuous faint clay films on faces of peds; few fine dark organic matter stains on faces of peds; very strongly acid (pH 4.5); clear smooth boundary. (7 to 23 inches thick)
3Btx--60 to 86 inches; light yellowish brown (10YR 6/4) silt loam, dark yellowish brown (10YR 4/4) moist; weak coarse prismatic structure; extremely hard, extremely firm and brittle, moderately sticky and moderately plastic; many very fine and fine, and common medium tubular and vesicular pores; continuous prominent clay films lining pores, continuous distinct clay films on faces of peds; very thin coatings of E material; very strongly acid (pH 4.8).
TYPE LOCATION: Clearwater County, Idaho; about 1.5 miles north of Weippe, Idaho; about 1,200 feet north and 2,400 feet west, of the southeast corner of Section 3, T. 35 N., R. 4 E. Latitude - 46 degrees, 24 minutes, 5 seconds North; Longitude - 115 degrees, 56 minutes, 28 seconds West; USGS Weippe North Quadrangle.
RANGE IN CHARACTERISTICS:
Soil moisture - usually moist year round, not dry for 45 consecutive days June to October. (udic moisture regime)
Average annual soil temperature - 39 to 46 degrees F.
Average summer soil temperature - 47 to 52 degrees F., with an O horizon (frigid temperature regime)
Depth to fragipan - 20 to 40 inches
Control section - Clay content average - 18 to 26 percent
A horizon
Hue - 7.5YR or 10YR dry or moist
Value - 4 to 6 dry, 2 to 4 moist
Chroma - 2 to 4 dry or moist
Texture - Ashy-L, Ashy-SIL
Clay content - 8 to 23 percent
Rock fragments 0 to 2 percent gravel
Reaction - strongly acid to neutral
Volcanic glass content - 5 to 12 percent
Acid oxalate extractable Al + 1/2 Fe - 0.4 to 0.8 percent
Bw, BA, or BE horizon (absent in some profiles)
Hue - 7.5YR or 10YR dry or moist
Value - 5 or 6 dry, 3 or 4 moist
Chroma - 3 to 5 dry and 3 or 4 moist
Clay content - 8 to 25 percent
Rock fragments 0 to 2 percent gravel
Reaction - strongly acid to neutral
Volcanic glass content - 8 to 10 percent
Acid oxalate extractable Al + 1/2 Fe - 0.4 to 0.5 percent
2E horizon (absent in some profiles)
Value - 6 or 7 dry, 4 or 5 moist
Chroma - 2 to 4 dry and 2 to 6 moist
Clay content - 12 to 26 percent
Reaction - slightly acid to very strongly acid
2EB (present in some profiles)
E part
Value 6 or 7 dry, 5 moist
Chroma 2 or 3 dry, 3 or 4 moist
B part
Value 4 dry or moist
Chroma 4 dry or moist
Clay content 18 to 21 percent
Reaction very strongly acid or strongly acid
2B/E or E/B horizon (absent in some profiles)
B part
Hue - 7.5YR or 10YR moist
Value - B part - 4 to 6 dry
Chroma 3 to 6 dry or moist
Texture SIL, SICL
Clay content 16 to 33 percent
E part
Hue 10YR or 2.5Y dry or moist
Value - 6 to 8 dry and 4 to 6 moist
Chroma - 1 to 4 dry and 2 to 4 moist
Texture - SIL, SICL
Clay content - 10 to 26 percent
Reaction - very strongly acid to slightly acid
2Btx horizons
Hue - 7.5YR or 10YR dry, 5YR to 10YR moist
Value - 4 to 7 dry, 3 to 6 moist
Chroma - 3 to 6 dry or moist
Texture - SIL, SICL, C
Clay content - 19 to 45 percent
Gravel content 0 to 1 percent (fine)
Reaction - very strongly acid to slightly acid
3Btx horizon (absent in some profiles)
Hue - 5YR to 10YR dry or moist
Value - 5 to 7 dry and 3 to 5 moist
Chroma - 4 to 6 dry and 3 to 6 moist
Texture - SICL, CL, SIL, L
Clay content - 19 to 38 percent
Reaction - very strongly acid to moderately acid
COMPETING SERIES: This is the Lewhand series. Lewhand soils have a fragipan at 13 to 19 inches.
GEOGRAPHIC SETTING: The Reggear soils are on mountain slopes or hills on basalt plateaus. They have elevations of 1,600 to 3,800 feet and slopes of 2 to 40 percent. These soils formed in loess and reworked loess with a mixed volcanic ash mantle. The average annual air temperature varies from about 38 degrees to about 45 degrees F. The average annual precipitation is 26 to 45 inches, and the frost free period is 50 to 110 days (9 in 10 years to 1 in 10 years, respectively).
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Carlinton, Cavendish, Grangemont, Kauder, and Wilkins series. Carlinton and Cavendish soils are on south and west facing hills and have xeric moisture regimes. Kauder and Grangemont soils are on similar landscapes and have ash mantles 7 to 13 inches thick. Grangemont soils do not have a fragipan. Wilkins soils are in drainageways and are somewhat poorly drained.
DRAINAGE AND PERMEABILITY: Moderately well drained, runoff is medium to rapid.Permeability is very slow in the fragipan. A perched water table is present. Typically it occurs at a depth of 22 to 28 inches from December through May, but can occur at a depth of 18 to 34 inches November through July.
USE AND VEGETATION: This soil is used mainly for timber production, livestock grazing, tree nurseries, wildlife habitat, and watershed. The natural vegetation is grand fir, Douglas-fir, oceanspray, snowberry, ninebark, huckleberry, queencup beadlily, myrtle pachystima, and goldthread.
DISTRIBUTION AND EXTENT: North Central Idaho. MLRA 43A. Reggear soils are of moderate extent.
MLRA OFFICE RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: St. Joe Area, Shoshone County, Idaho, 1993.
REMARKS: Type location moved to present location in 1983.
Diagnostic horizons and other features recognized in this pedon:
Ochric epipedon - the zone from 2 to 8 inches (A horizon)
Vitrandic feature - the zone from 2 to 13 inches (A and Bw horizons)
Oxyaquic feature the zone from 22 to 31 inches (2B/E horizon)
Cambic horizon - the zone from 8 to 13 inches (Bw horizon)
Argillic horizon and fragipan - the zone from 31 to 86 inches (2Btx1, 2Btx2, and 3Btx horizons)
Particle size control section - the zone from 10 to 31 inches (lower part of Bw, 2E, and 2B/E
Horizons
ADDITIONAL DATA:
Laboratory data are available for this series: Reference sample - S83ID-035-002 (84P107) (this pedon) and S83ID-035-005 (84P112) from Clearwater County, Idaho; 9/83 by NSSL, Lincoln, NE. Partial laboratory data available S91ID- 009-004 (92P0277) from east Benewah County, Idaho; by NSSL, Lincoln, NE.