LOCATION ANNRIVER MN+WIEstablished Series
TAXONOMIC CLASS: Coarse-loamy over sandy or sandy-skeletal, mixed, superactive, frigid Mollic Endoaqualfs
TYPICAL PEDON: Annriver silt loam on a west facing plane slope of 1 percent in a cultivated field. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 9 inches; very dark gray (2.5Y 3/1) silt loam, dark gray (2.5Y 4/1) dry; weak fine granular structure; friable; 2 percent gravel; moderately acid; abrupt smooth boundary. (4 to 9 inches thick)
Eg--9 to 14 inches; dark grayish brown (2.5Y 4/2) silt loam, light brownish gray (2.5Y 6/2) dry; common fine distinct dark yellowish brown (10YR 4/6) Fe concentrations; weak fine platy structure; friable; 2 percent gravel; strongly acid; clear wavy boundary. (2 to 8 inches thick)
Btg1--14 to 21 inches; grayish brown (2.5Y 5/2) silt loam; common medium prominent strong brown (7.5YR 4/6) Fe concentrations; moderate medium subangular blocky structure; friable; common discontinuous faint dark grayish brown (2.5Y 4/2) clay films on faces of peds and in pores; 2 percent gravel; strongly acid; clear wavy boundary. (3 to 15 inches thick)
2Btg2--21 to 31 inches; brown (7.5YR 5/2) loam; common medium prominent strong brown (7.5YR 4/6) Fe concentrations; moderate medium subangular blocky structure; friable; common discontinuous distinct dark brown (7.5YR 3/4) clay films on faces of peds and in pores; 8 percent gravel; strongly acid; clear wavy boundary. (3 to 15 inches thick)
3C1--31 to 47 inches; brown (7.5YR 4/3) gravelly coarse sand; common medium distinct strong brown (7.5YR 4/6) Fe concentrations; single grain; loose; 20 percent gravel; moderately acid; gradual smooth boundary.
3C2--47 to 80 inches; brown (7.5YR 4/2) gravelly coarse sand; single grain; loose; 20 percent gravel; slightly acid.
TYPE LOCATION: Kanabec County, Minnesota; about 4 miles north and 4 miles west of Mora; 500 feet south and 1500 feet east of the northwest corner of sec. 30, T. 40 N., R. 24 W.; USGS Ann Lake topographic quadrangle; lat. 45 degrees 55 minutes 53 seconds N. and long. 93 degrees 22 minutes 58 seconds W.; NAD27.
RANGE IN CHARACTERISTICS: Thickness of the silty mantle ranges from 12 to 40 inches. The depth to stratified sandy outwash ranges from 20 to 40 inches. Volume of gravel ranges from 0 to 5 percent in the silty mantle and from 5 to 15 percent in the loamy lower subsoil. Volume of gravel in the sandy outwash ranges from 10 to 50 percent as a weighted average, but some pedons may have individual strata with less than 10 percent gravel.
The Ap or A horizon has hue of 10YR or 2.5Y, value of 2 or 3, and chroma of 1 or 2. It is silt loam or silty clay loam. It is strongly acid to neutral.
The Eg horizon has hue of 10YR, 2.5Y, or 5Y, value of 4 to 6, and chroma of 1 or 2. It has distinct or prominent redoximorphic features. It is commonly silt loam, but includes very fine sandy loam or loam high in very fine sand. It is strongly acid to slightly acid.
An E/B or B/E horizon is in some pedons and has the same color and texture ranges as the Eg and Bt horizons. It has distinct or prominent redoximorphic features. It is strongly acid to slightly acid.
The Btg horizon has hue of 10YR or 2.5Y, value of 4 to 6, and chroma of 1 or 2. It has distinct or prominent redoximorphic features. It is silt loam or silty clay loam but includes very fine sandy loam or loam high in very fine sand. It is strongly acid to slightly acid.
The 2Btg or 2Bt horizon has hue of 7.5YR or 10YR, value of 3 to 5, and chroma of 2 to 4. It has distinct or prominent redoximorphic features. It is loam, fine sandy loam, or sandy loam. It is strongly acid to neutral.
Some pedons have a 3Bt horizon with color like the 2Bt described above. It is loamy sand, loamy coarse sand or their gravelly and very gravelly analogues.
The 3C horizon has hue of 5YR or 7.5YR, value of 3 or 4, and chroma of 2 to 4. It is sand, coarse sand or their gravelly and very gravelly analogues. It is strongly acid to neutral.
COMPETING SERIES: There are no competing series.
GEOGRAPHIC SETTING: Annriver soils typically are on outwash plains. Slopes range from 0 to 2 percent. They formed in a silty mantle of loess or lacustrine deposits overlying loamy alluvium and sandy outwash. Mean annual precipitation ranges from about 24 to 33 inches. Mean annual air temperature ranges from 37 to 45 degrees F. The frost free period ranges from about 90 to 145 days. Elevation ranges from 700 to 1700 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Antigo, Billyboy, Chetek, Minocqua, Ossmer and Rosholt soils. The very poorly drained Minocqua, somewhat poorly drained Ossmer, the moderately well drained Billyboy, and the well drained Antigo soils form the hydrosequence with Annriver soils in Minnesota. Chetek and Rosholt soils are on higher lying landscape positions.
DRAINAGE AND PERMEABILITY: Poorly and very poorly drained. Surface runoff is low. Permeability is moderate in the silty mantle and rapid or very rapid in the sandy outwash. Poorly drained phases have an apparent water table at 0 to 1 feet at some time during the months of October to June in most years. Very poorly drained phases have an apparent water table at +1 to 0 feet at some time during the months of October to June in most years.
USE AND VEGETATION: Most of this soil is cropped, forested or used as hayland or pasture. Native vegetation was mixed deciduous forest or mixed deciduous-coniferous forest.
DISTRIBUTION AND EXTENT: East Central Minnesota and north central and northwestern Wisconsin. Extensive. LRR K, MLRA-90A, and MLRA-90B.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: St. Paul, Minnesota
SERIES ESTABLISHED: Burnett County, Wisconsin, 2004.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Particle size control section - the zone from 14 to 40 inches.
Ochric epipedon - the zone from 0 to 14 inches (Ap, Eg).
Argillic horizon - the zone from 14 to 31 inches (Btg1, 2Btg2).
Reduced matrix - in the zone from 9 to 31 inches (Eg, Btg1, 2Btg2).
Redoximorphic concentrations - oxidized color features in the zone from 9 to 47 inches.
Aquic conditions within 20 inches of the surface. Redoximorphic features in the E horizon are used as field indicators to soil saturation. Mollic subgroup based on dark colors of the Ap horizon.
This soil was previously included with the Hillet series, which is in the Epiaquolls Great group class.