LOCATION DRANBURN ID
Established Series
Rev. SM/CLM/TWH
12/2022
DRANBURN SERIES
The Dranburn series consists of very deep, well drained soils formed in mixed alluvium and colluvium on mountains. Permeability is moderately slow. Dranburn soils have slopes of 15 to 45 percent. Average annual precipitation is about 20 inches. Average annual air temperature is about 39 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Dranburn silt loam on an 18 percent slope at 5,920 feet elevation. (Colors are for air dry soil unless otherwise stated.)
Oi--0 to 1 inch; undecomposed leaves and twigs primarily from aspen and the understory; moderately acid (pH 5.6); abrupt wavy boundary. (0 to 2 inches thick)
A1--1 to 10 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; weak medium subangular blocky structure parting to weak fine granular; very hard, friable, slightly sticky and slightly plastic; many very fine, fine, and medium and common coarse roots; many very fine and fine tubular and irregular pores; neutral (pH 6.7); clear smooth boundary. (9 to 12 inches thick)
A2--10 to 17 inches; dark grayish brown (10YR 4/2) silt loam, very dark brown (10YR 2/2) moist; moderate medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; many very fine, fine, and medium and common coarse roots; many very fine and fine tubular pores; 5 percent gravel and 2 percent cobbles; slightly acid (pH 6.5); clear smooth boundary. (6 to 12 inches thick)
AB--17 to 22 inches; brown (10YR 5/3) silty clay loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; hard, firm, slightly sticky and slightly plastic; common very fine and fine and few medium and coarse roots; many very fine and fine tubular pores; 5 percent gravel; slightly acid (pH 6.4); clear wavy boundary. (0 to 8 inches thick)
Bt1--22 to 28 inches; yellowish brown (10YR 5/4) silty clay loam, dark brown (10YR 3/3) moist; moderate fine subangular blocky structure; very hard, firm, slightly sticky and slightly plastic; common very fine and fine and few medium and coarse roots; many very fine and fine tubular pores; few faint clay films on faces of peds and in pores; 10 percent gravel; slightly acid (pH 6.3); clear wavy boundary. (4 to 11 inches thick)
Bt2--28 to 43 inches; light yellowish brown (10YR 6/4) gravelly silty clay loam, yellowish brown (10YR 5/4) moist; moderate medium subangular blocky structure; very hard, very firm, sticky and plastic; few very fine, fine, and medium roots; common very fine tubular pores; common distinct clay films on faces of peds and in pores; 20 percent gravel; slightly acid (pH 6.2); gradual wavy boundary. (10 to 18 inches thick)
Bt3--43 to 48 inches; brownish yellow (10YR 6/6) gravelly silty clay loam, yellowish brown (10YR 5/4) moist; moderate fine subangular blocky structure; very hard, very firm, sticky and plastic; few very fine and fine roots; common very fine tubular pores; few faint clay films on faces of peds and in pores; 15 percent gravel; slightly acid (pH 6.2); clear wavy boundary. (4 to 10 inches thick)
BC--48 to 61 inches; brownish yellow (10YR 6/6) silty clay loam, yellowish brown (10YR 5/4) moist; weak fine subangular blocky structure; very hard, very firm, sticky and plastic; common very fine tubular pores; 10 percent gravel; slightly acid (pH 6.2).
TYPE LOCATION: Franklin County, Idaho; about 3 miles northwest of Treasureton, Idaho; about 2,100 feet east and 1,000 feet north of the southwest corner of sec. 36, T 12 S, R 39 E. Latitude - 42 degrees, 19 minutes, 54 seconds North; Longitude - 111 degrees, 50 minutes, 49 seconds West.
RANGE IN CHARACTERISTICS: (Depths given are measured from the mineral soil surface)
Thickness of mollic epipedon - 20 to 30 inches
Depth to argillic horizon - 16 to 23 inches
Average annual soil temperature - 38 to 42 degrees F.
Average summer soil temperature - 49 to 52 degrees F. without and O horizon
Soil moisture regime - udic; dry for
Soil moisture control section - dry for 50 to 90 days
Particle-size control section (weighted averages):
Clay content average - 28 to 35 percent (total clay)
Rock fragment content - 0 to 20 percent
Absent in some pedons:
BC horizon
A Horizon:
Hue - 7.5YR or 10YR
Value - 3 through 5 dry, 2 or 3 moist
Chroma - 1 through 3 dry or moist
Reaction - slightly acid or neutral
Bt Horizons:
Hue - 7.5YR or 10YR
Value - 5 or 6 dry, 3 through 5 moist
Chroma - 3 through 6 dry or moist
Texture - silty clay loam or gravelly silty clay loam
Reaction - slightly acid or neutral
COMPETING SERIES: These are the
Bachus,
Bavdark,
Benteen,
Brushtop,
Clayburn,
Croydon,
Crystalbutte,
Davtone,
Decross,
Dehana,
Demast,
Dranyon,
Dry Canyon,
Echemoor,
Hagenbarth,
Hoopgobel,
Millerlake,
Pontuge,
Senchert,
Southmount,
Poodle,
Stubbs,
Thulepah,
Vadnais, and
Winu series. Bachus, Benteen, Echemoor, Senchert, Vadnais, and Winu soils have bedrock at depths of 20 to 40 inches.
Bavdark soils have less than 45 percent silt in the argillic horizon.
Brushtop soils are 40 to 60 inches to a lithic contact.
Clayburn soils have moderate permeability and have a sandy clay loam, clay loam, or loam particle-size control section which contains less than 45 percent silt.
Croydon soils are 40 to 60 inches to a lithic contact.
Crystalbutte soils have 25 to 35 percent rock fragments in the particle-size control section.
Davtone soils have hues of 5YR or redder in the argillic horizon.
Decross soils have a zone of calcium carbonate accumulation at depths of 20 to 40 inches.
Dehana,
Demast, and
Dranyon soils have 20 to 35 percent coarse fragments in the argillic horizon.
Dry Canyon soils are 40 to 60 inches to a lithic contact.
Hagenbarth soils have an average summer soil temperature of 52 to 58 degrees F.
Hoopgobel soils are 20 to 40 inches to a paralithic contact.
Millerlake soils have horizons of carbonate accumulation at depths of 15 to 40 inches.
Pontuge soils have horizons of secondary carbonate accumulation.
Southmount soils are moderately well drained and have mottles at 18 to 40 inches.
Poodle soils are moderately deep to a paralithic contact.
Stubbs soils have a paralithic contact a depths of 20 to 40 inches.
Thulepah soils are dry for more than 90 cumulative days from July to October.
GEOGRAPHIC SETTING: Dranburn soils are on mountain slopes at elevations of 5,400 to 7,000 feet. They formed in mixed alluvium and colluvium derived from quartzite with some loess influence. Slopes are 15 to 45 percent. The average annual precipitation ranges from 17 to 22 inches. The average annual air temperature is 37 to 41 degrees F. The frost free period is 50 to 70 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Northwater,
Robin, and
Yeates Hollow soils. Northwater soils are on steep north slopes higher on the landscape than Dranburn soils. Northwater soils have a loamy-skeletal particle-size control section. Robin soils are on similar landscape positions as Dranburn soils. Robin soils have a fine-silty particle-size control section and the top of the argillic horizon is deeper than 24 inches. Yeates Hollow soils are on south and west facing slopes lower on the landscape than Dranburn soils. Yeates Hollow soils have a clayey-skeletal particle-size control section.
DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; moderately slow permeability.
USE AND VEGETATION: These soils are used for rangeland. The natural vegetation is big-tooth maple, quaking aspen, and mountain brome. In some areas Rocky Mountain Douglas-fir is part of the natural vegetation.
DISTRIBUTION AND EXTENT: Southeast Idaho. MLRAs 13, 47. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Franklin County, Idaho, 1997.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon (pachic feature) - from 1 to 28 inches. (the A1, A2, AB, and Bt1 horizons)
Argillic horizon - the zone from 22 to 48 inches. (the Bt1, Bt2, and Bt3 horizons)
Particle-size control section - the zone from 22 to 42 inches (the Bt1 and part of the Bt2 horizon)
Keys to Soil Taxonomy: Series classified according to Eleventh Edition, 2011. The superactive CE activity class is presumed for this series based on the general trend indicated by lab data throughout this region.
The 06/2011 revision changes the moisture regime from xeric to udic. This brings this series in line with other series in MLRA 47 that have quaking aspen ecological sites.
National Cooperative Soil Survey
U.S.A.