LOCATION COHOCTAH MI+IL IN MN NY OH

Established Series
Rev. NWS-LWB-GLH
08/2012

COHOCTAH SERIES

The Cohoctah series consists of very deep, poorly drained or very poorly drained soils formed in loamy alluvial deposits on flood plains. Slope ranges from 0 to 2 percent. Mean annual precipitation is about 914 mm (35 inches), and mean annual temperature is about 10.0 degrees C (50 degrees F).

TAXONOMIC CLASS: Coarse-loamy, mixed, active, mesic Fluvaquentic Endoaquolls

TYPICAL PEDON: Cohoctah loam, on a slope of less than 1 percent in a wooded area at an elevation of 189 meters (620 feet) above mean sea level. (Colors are for moist soil unless otherwise stated.)

A--0 to 33 cm (13 inches); very dark gray (10YR 3/1) loam, gray (10YR 5/1) dry; weak medium granular structure; friable; slightly alkaline; clear smooth boundary. [25 to 61 cm (10 to 24 inches) thick]

Bg1--33 to 53 cm (13 to 21 inches); dark gray (10YR 4/1) sandy loam; weak coarse subangular blocky structure; friable; many medium distinct very dark brown (10YR 2/2) organic stains on vertical faces of peds; slightly alkaline; clear smooth boundary.

Bg2--53 to 84 cm (21 to 33 inches); grayish brown (10YR 5/2) fine sandy loam; weak coarse subangular blocky structure; friable; many fine prominent yellowish red (5YR 5/6) masses of oxidized iron throughout; strongly effervescent; moderately alkaline; abrupt smooth boundary.

Bg3--84 to 102 cm (33 to 40 inches); very dark grayish brown (10YR 3/2) loam; weak coarse subangular blocky structure; friable; few fine faint gray (10YR 5/1) iron depletions throughout; strongly effervescent; moderately alkaline; abrupt wavy boundary.

Bg4--102 to 142 cm (40 to 56 inches); grayish brown (10YR 5/2) sandy loam; weak coarse subangular blocky structure; friable; common medium prominent yellowish brown (10YR 5/8) masses of oxidized iron throughout; strongly effervescent; moderately alkaline; clear smooth boundary. [Combined thickness of the Bg horizon is 76 to 127 cm (30 to 50 inches).]

2Cg1--142 to 183 cm (56 to 72 inches); gray (10YR 5/1) sand; single grain; loose; strongly effervescent; moderately alkaline; clear wavy boundary.

2Cg2--183 to 203 cm (72 to 80 inches); dark gray (10YR 4/1) coarse sand; single grain; loose; 10 percent gravel; strongly effervescent; moderately alkaline.

TYPE LOCATION: Ottawa County, Michigan; about 4 1/2 miles east of Pearline; 2,440 feet east and 320 feet north of the southwest corner of sec. 22, T. 7 N., R 13 W.; USGS Grandville topographic quadrangle; lat. 42 degrees 58 minutes 25.8 seconds N. and long. 85 degrees 50 minutes 7.35 seconds W., NAD 27; UTM Zone 16, 594963 easting and 4758570 northing, NAD 83.

RANGE IN CHARACTERISTICS:
Thickness of the mollic epipedon: 25 to 61 cm (10 to 24 inches)
Particle-size control section: the percent of silt plus twice the percent of clay averages greater than 30 percent

A horizon:
Hue: 10YR
Value: 2 or 3
Chroma: 1 or 2
Texture: loam, silt loam, sandy loam, very fine sandy loam, fine sandy loam, loamy fine sand, or mucky very fine sandy loam
Reaction: slightly acid to slightly alkaline

Bg horizon, or Ab horizon where present:
Hue: 10YR to 5Y, or is neutral
Value: 2 to 6
Chroma: 0 to 4
Texture: sandy loam, fine sandy loam, loamy fine sand, or loam, or their mucky analogues, with thin layers or lenses of sand, fine sand, loamy sand, loamy fine sand, or silt loam in some pedons
Rock fragment content: 0 to 10 percent gravel
Reaction: slightly acid to moderately alkaline

Cg horizon, or Ab horizon where present:
Hue: 10YR to 5Y, or is neutral
Value: 2 to 6
Chroma: 0 to 2
Texture: fine sand, loamy sand, loamy fine sand, sand, or coarse sand, with thin strata of sandy loam, fine sandy loam, loam, or silt loam
Rock fragment content: 0 to 10 percent gravel
Reaction: slightly alkaline or moderately alkaline

COMPETING SERIES: There are no other series in this family. Similar soils are the Ceresco, Gilford, Glendora, Lyles, and Sloan series. Ceresco soils do not have dominant gray colors just below the mollic epipedon. Gilford and Lyles soils have a regular decrease in organic matter content with increasing depth. Glendora soils have a sandy particle-size control section. Sloan soils have a fine-loamy particle-size control section.

GEOGRAPHIC SETTING: Cohoctah soils are in abandoned drainageways and depressions on flood plains. Slope ranges from 0 to 2 percent. Cohoctah soils formed in loamy alluvial deposits. Mean annual precipitation ranges from 737 to 1016 mm (29 to 40 inches). Mean annual temperature ranges from 7.8 to 11.1 degrees C (46 to 52 degrees F). Frost-free period is 130 to 170 days. Elevation is 177 to 351 meters (580 feet to 1,150 feet) above mean sea level.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Abscota, Algansee, Ceresco, Glendora, Landes, Shoals, and Sloan soils. The somewhat poorly drained Ceresco soils and the well drained Landes soils are in a drainage sequence with the Cohoctah soils. The moderately well drained Abscota soils are on higher rises, the somewhat poorly drained Algansee soils are on slightly higher rises, and the poorly drained or very poorly drained Glendora soils are on similar landforms and are commonly on the same flood plain but have a sandy particle-size control sections. The somewhat poorly drained Shoals soils are on slightly higher positions and the very poorly drained Sloan soils are on similar landforms; both have fine-loamy particle-size control sections and commonly are on the same flood plain.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Poorly drained or very poorly drained. The depth to the top of an apparent seasonal high water table ranges from near the surface to 30 cm (1 foot) below the surface from September to May in normal years. The potential for surface runoff is very low or negligible. Saturated hydraulic conductivity is high. Permeability is moderately rapid. The soil is commonly flooded for brief to long periods of time from November to May.

USE AND VEGETATION: A small part has adequate artificial drainage, and is under cultivation. Corn is the principal crop and some is in legume-grass hay. The main part is in permanent pasture, woodland, or brush. Native vegetation is red maple, white ash, swamp white oak, American elm, alder, and quaking aspen.

DISTRIBUTION AND EXTENT: MLRAs 97, 98, 99, 101, and 103 in southern Michigan, Illinois, Indiana, New York, Ohio, and Minnesota. The series is of large extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: AMHERST, MASSACHUSETTS

SERIES ESTABLISHED: Ionia County, Michigan, 1965.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: from the surface to a depth of 33 cm (13 inches) (A horizon).
Cambic horizon: from a depth of 33 to 142 cm (13 to 56 inches) (Bg horizon).
Aquic conditions: redoximorphic features immediately below the mollic epipedon and in all underlying horizons.

National Cooperative Soil Survey
U.S.A.