LOCATION VADNAIS ID
Established Series
Rev. LAR/HBM/CLM/RWL
12/2022
VADNAIS SERIES
The Vadnais series consists of moderately deep, well drained soils that formed in loess and eolian sand influenced by local alluvium. Vadnais soils are on basalt plains. Permeability is slow. Slopes range from 1 to 50 percent. The average annual precipitation is about 20 inches and the average annual air temperature is about 39 degrees F.
TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Argicryolls
TYPICAL PEDON: Vadnais silt loam - on a northeast-facing slope of 6 percent under sagebrush and grass at 5,820 feet elevation. When described on July 21, 1980, the soil was wet below 8 inches. (Colors are for dry soil unless otherwise stated.)
A1--0 to 2 inches; dark brown (10YR 3/3) silt loam, very dark grayish brown (10YR 3/2) moist; weak coarse granular structure; soft, very friable, slightly sticky and slightly plastic; many very fine and fine roots; common very fine tubular pores; moderately acid (pH 5.6); clear wavy boundary. (2 to 5 inches thick)
A2--2 to 8 inches; dark brown (10YR 3/3) silt loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, few coarse roots; common very fine tubular pores; moderately acid (pH 5.7); clear wavy boundary. (3 to 8 inches thick)
Bt1--8 to 14 inches; dark yellowish brown (10YR 4/4) silt loam, dark brown (10YR 3/3) moist; weak medium prismatic structure parting to moderate medium and fine subangular blocky; slightly hard, friable, slightly sticky and slightly plastic; common very fine and fine, few coarse roots; common very fine tubular pores; common faint clay films on faces of peds and lining tubular pores; 5 percent subangular vesicular basalt gravel; moderately acid (pH 5.8); clear wavy boundary. (4 to 6 inches thick)
Bt2--14 to 28 inches; yellowish brown (10YR 5/4) silt loam, dark brown (10YR 3/3) moist; moderate fine prismatic structure parting to moderate medium and fine subangular blocky; hard, firm, sticky and plastic; common very fine roots; common very fine pores; many faint clay films on faces of peds and lining tubular pores; 5 percent subangular vesicular basalt gravel; moderately acid (pH 5.8); clear wavy boundary. (8 to 14 inches)
Bt3--28 to 36 inches; yellowish brown (10YR 5/4) cobbly silty clay loam, brown (10YR 4/3) moist; moderate fine prismatic structure parting to strong medium and fine subangular blocky; hard, firm, sticky and plastic; common very fine roots; common very fine tubular pores; many distinct clay films on faces of peds and lining tubular pores; 20 percent angular vesicular basalt cobbles; moderately acid (pH 5.9); abrupt wavy boundary. (8 to 16 inches thick)
2R--36 inches; vesicular basalt bedrock.
TYPE LOCATION: Fremont County, Idaho; about 4 miles west of the Sand Creek Wildlife Management area Headquarters; 1,600 feet west 1,180 feet south of the northeast corner of sec. 11, T.10N., R.40E.
RANGE IN CHARACTERISTICS:
Thickness of mollic epipedon - 17 to 38 inches
Thickness of solum - 27 to 38 inches
Depth to bedrock - 20 to 40 inches
Particle-size control section - 19 to 29 percent clay
Average annual soil temperature - 39 to 43 degrees F
Average summer soil temperature - 56 to 59 degrees F
Soil moisture - dry throughout the moisture control section for 45 to 60 consecutive days during the four months following the summer solstice.
A horizon
Hue - 7.5YR or 10YR
Value - 3 to 5 dry, 2 to 3 moist
Chroma - 2 or 3 dry or moist
Rock fragments - 0 to 5 percent
Reaction - moderately acid or slightly acid
B horizon
Hue - 10YR through 5YR
Value - 4 through 6 dry, 3 or 4 moist
Chroma - 3 or 4 dry, 2 or 3 moist
Rock fragments - 0 to 20 percent
Texture - SIL, L, SICL, CB-SICL, included in some pedons in lower part C, SC, GR-C
Reaction - moderately acid or slightly acid
COMPETING SERIES: These are the
Bachus,
Bavdark (T),
Benteen,
Cambern,
Clayburn,
Crystalbutte,
Davtone,
Decross,
Dehana,
Demast,
Dranburn (T),
Dranyon,
Echemoor,
Gordo,
Hagenbarth,
Millerlake,
Senchert,
Southmount,
Poodle,
Stubbs,
Thulepah, and
Winu soils. Clayburn, Crystalbutte, Davtone, Decross, Dehana, Demast, Dranburn, Dranyon, Gordo, Hagenbarth, Millerlake, Southmount, and Thulepah have bedrock at depths greater than 40 inches. Bachus soils occur in a climate with a predominance of summer precipitation. Benteen soils have an average summer soil temperature of 45 to 52 degrees F. and have C horizons that contain 20 to 40 percent limestone rock fragments. Bavdark soils are greater than 60 inches deep to bedrock. Cambern soils formed in ash and tuff in an area of predominately summer moisture, and have O horizons. Echemoor and Stubbs soils are moderately deep to a paralithic contact. Harmehl soils have more than 20 percent rock fragments in the argillic horizon. Senchert soils have O horizons and are neutral to mildly alkaline in the Bt horizon. Poodle soils are moderately deep to a paralithic contact. Winu soils have 20 to 35 percent rock fragments in the upper 20 inches of the argillic horizon.
GEOGRAPHIC SETTING: Vadnais soils are on basalt plains at elevations of 5,300 to 6,900 feet. Slopes are 1 to 50 percent. The soils formed in loess and eolian sands influenced by valley side alluvium. Average annual precipitation is 18 to 26 inches. Most of this precipitation comes in the winter and spring months. Average annual air temperature is 37 to 41 degrees F and the average summer air temperature is 55 to 58 degrees F. The frost-free period is 40 to 80 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Fourme,
Hagenbarth,
Katseanes,
Pinebutte and
Sudpeak soils. The Fourme soils are moderately deep to sand and gravel and occupy lower outwash plains. The Sudpeak soils are fine, montmorillonitic and moderately-well drained occurring on lower outwash plains and flood plains. Katseanes soils are shallow and are adjacent to pressure ridges or rock outcrops. Pinebutte soils have a layer of calcium carbonate accumulation in the substratum and are in concavities. Hagenbarth soils are deep and in concavities.
DRAINAGE AND PERMEABILITY: Well drained; slow to rapid runoff; slow permeability.
USE AND VEGETATION: The soil is used principally for rangeland. Natural vegetation is mainly mountain big sagebrush, bluebunch wheatgrass, and Idaho fescue.
DISTRIBUTION AND EXTENT: These soils are moderately extensive in southeastern Idaho.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Fremont County, Idaho, 1989.
REMARKS: Diagnostic horizons and features recognized in this soil are:
Mollic epipedon - the zone from the surface to 28 inches (A1, A2, Bt1, and Bt2 horizons).
Argillic horizon - the zone from 8 to 36 inches (Bt1, Bt2, and Bt3 horizons).
Lithic contact - at a depth of 36 inches (2R horizon).
Particle-size control section - the zone from 8 to 28 inches (Btl and Bt2 horizons).
Soil moisture regime - xeric
This draft reflects a change in classification from mixed Argic Pachic Cryoborolls to mixed, superactive Argic Pachic Cryoborolls based on Soil Taxonomy issue #18.
National Cooperative Soil Survey
U.S.A.