LOCATION WRENCOE IDEstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, frigid Vertic Endoaquolls
TYPICAL PEDON: Wrencoe silty clay - on a 1 percent slope in a meadow at 2,070 feet elevation. (Colors are for moist soil unless otherwise noted. When described the soil was moist throughout.)
Oi--0 to 0.5 inches to 0; grass, roots, stems, and leaves.
A1--0.5 to 5 inches; mixed, very dark gray (10YR 3/1) and very dark grayish brown (10YR 3/2) silty clay, gray (10YR 5/1) and grayish brown (10YR 5/2) dry; strong fine and medium subangular blocky structure parting to strong fine and medium granular; hard, firm, moderately sticky and very plastic; many very fine, common fine, and few medium roots; common very fine, few fine and medium tubular pores; slightly acid (pH 6.2); clear wavy boundary. (3 to 8 inches thick)
A2--5 to 10 inches; very dark grayish brown (10YR 3/2) silty clay, grayish brown (10YR 5/2) dry; few fine distinct dark yellowish brown (10YR 4/4) redox concentrations; moderate medium and coarse subangular blocky structure; hard, firm, sticky and very plastic; common very fine, few fine, and medium roots; common very fine and few fine tubular pores; common fine and medium iron and manganese stains; slightly acid (pH 6.2); gradual wavy boundary. (4 to 7 inches thick)
Bg--10 to 15 inches; mixed dark gray (10YR 4/1) and dark grayish brown (10YR 4/2) silty clay, gray (10YR 6/1) and light brownish gray (10YR 6/2) dry; common medium distinct dark yellowish brown (10YR 4/4) redox concentrations; moderate coarse subangular blocky structure; hard, firm, moderately sticky and very plastic; few very fine, fine, and medium roots; many very fine and few fine tubular pores; common fine and medium iron and manganese stains; slightly acid (pH 6.2); clear wavy boundary. (3 to 7 inches thick)
Btg1--15 to 23 inches; mixed dark grayish brown (10YR 4/2) and grayish brown (10YR 5/2) silty clay, light gray (10YR 7/1) and light brownish gray (10YR 6/2) dry; common medium distinct dark yellowish brown (10YR 4/4) redox concentrations; weak coarse prismatic structure parting to moderate coarse angular blocky; very hard, very firm, very sticky and very plastic; few very fine roots; many very fine, few fine and medium tubular pores; few distinct clay films in pores; common medium and large iron and manganese stains; slightly acid (pH 6.5); clear wavy boundary. (5 to 10 inches thick)
Btg2--23 to 36 inches; mixed grayish brown (10YR 5/2) and light brownish gray (10YR 6/2) silty clay, light gray (10YR 7/1) and white (10YR 8/1) dry; many fine and medium distinct yellowish brown (10YR 5/4 and 10YR 5/6) redox concentrations; moderate very coarse prismatic structure; very hard, very firm, very sticky and very plastic; few very fine and fine roots; common very fine and few fine tubular pores; common distinct clay films on faces of peds; common medium and large iron and manganese stains; pressure faces are evident as peds dry out; neutral (pH 6.8); gradual wavy boundary. (10 to 14 inches thick)
Btg3--36 to 50 inches; mixed gray (10YR 5/1), grayish brown (10YR 5/2), and light brownish gray (10YR 6/2) silty clay; light gray (10YR 7/1), light gray (10YR 7/2) and white (10YR 8/1) dry; many fine and medium distinct yellowish brown (10YR 5/4 and 10YR 5/6) redox concentrations; weak very coarse prismatic structure; very hard, very firm, very sticky and very plastic; few very fine roots; common very fine and few fine tubular pores; common distinct clay films in pores and as bridges; common medium and large iron and manganese stains; neutral (pH 7.0); clear wavy boundary. (5 to 15 inches thick)
Btg4--50 to 60 inches; mixed gray (10YR 5/1), grayish brown (10YR 5/2), and light brownish gray (10YR 6/2) silty clay, light gray (10YR 7/1 and 10YR 7/2) and white (10YR 8/1) dry; few fine distinct brown (10YR 5/3) and yellowish brown (10YR 5/6) redox concentrations; massive; very hard, very firm, very sticky and very plastic; few very fine and fine tubular pores; few faint clay bridges; common fine and medium iron and manganese stains; neutral (pH 7.0); clear wavy boundary. (8 to 14 inches thick)
Cg--60 to 64 inches; mixed gray (10YR 5/1), grayish brown (10YR 5/2), and light brownish gray (10YR 6/2) silty clay, light gray (10YR 7/1 and 10YR 7/2) and white (10YR 8/1) dry; many fine and medium distinct yellowish brown (10YR 5/6) redox concentrations; massive; very hard, very firm, moderately sticky and very plastic; few very fine tubular pores; common fine iron and manganese stains; neutral (pH 7.0).
TYPE LOCATION: Bonner County, Idaho; about 0.3 miles north of Seneacquoteen, near the Pend Oreille River; about 1,600 feet east and 1,900 feet north of the southwest corner, sec. 31, T. 56, N., R. 3W.
RANGE IN CHARACTERISTICS:
Depth to high water table
December to June - 0 to 1.5 feet
July to November - 0 to 5 feet (dependent on the regulation of water by Albeni Falls dam)
Mollic epipedon thickness - 10 to 14 inches
Average annual soil temperature - 43 to 46 degrees F
Average summer soil temperature - 55 to 59 degrees F (without an O horizon and in saturated soil)
Solum thickness - 30 to 60 inches
A1 horizon
Color value, dry - 4 or 5
Texture - silty clay or silty clay loam
Reaction - slightly acid or neutral
B2t horizon
Color hue - 10YR, 2.5Y, or 5Y
Redox concentrations hue - 10YR or 7.5YR
Redox concentrations chroma, moist - 3 to 6
Reaction - slightly acid to slightly alkaline
C horizon
Color hue - 10YR to 5G
Redox concentrations hue - 10YR or 7.5YR
Redox concentrations value, moist - 4 to 6
Redox concentrations chroma, moist - 3 to 6
Texture - silty clay loam or silty clay, and gravelly or very gravelly in some pedons
Coarse fragments - 0 to 40 percent
Reaction - neutral to slightly alkaline
COMPETING SERIES: This is the Ceboya series and the similar Mountmed series. Ceboya soils have sola less than 20 inches thick. The Mountmed soils are smectitic.
GEOGRAPHIC SETTING: Wrencoe soils are on low terraces and floodplains at elevations of 2,050 to 2,100 feet. The slope range is 0 to 2 percent. The soils formed in lacustrine sediments derived from mixed sources. The average annual temperature ranges from 42 degrees to 45 degrees F, average annual precipitation ranges from 30 to 35 inches; and the frost-free season is 90 to 120 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bonner, Capehorn, Hoodoo, Mission, Odenson, and Pywell soils. Bonner soils are well drained and have sand and gravel at depths of 20 to 40 inches. Capehorn, Hoodoo, and Odenson soils are poorly drained and have less clay content. Mission soils are somewhat poorly drained and have a fragipan and an argillic. Pywell soils formed in organic materials.
DRAINAGE AND PERMEABILITY: Very poorly drained. Runoff is very slow. Permeability is slow. The soils are frequently flooded during the winter and spring months for very long periods.
USE AND VEGETATION: These soils are used for hay, pasture, grazing, wildlife habitat, and recreation. The natural vegetation is mainly rushes, cattails, willow, pyramid spirea, and sedge.
DISTRIBUTION AND EXTENT: Northern Idaho. These soils are inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bonner County, Idaho, 1981.