LOCATION ODENSON IDEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, frigid Aquandic Endoaquolls
TYPICAL PEDON: Odenson ashy silt loam - on a 0.5 percent slope in a pasture. (When described the soil was moist throughout. Colors are for moist soil unless otherwise noted.)
A1--0 to 4 inches; very dark grayish brown (10YR 3/2) ashy silt loam, grayish brown (10YR 5/2) dry; weak fine and medium granular structure; soft, friable, slightly plastic; many very fine, fine, and medium roots; many very fine and fine tubular pores; neutral (pH 7.0); clear wavy boundary. (4 to 5 inches thick)
A2--4 to 8 inches; very dark grayish brown (10YR 3/2) ashy silt loam, grayish brown (10YR 5/2) dry; weak medium and coarse subangular blocky structure parting to weak fine and medium granular; soft, friable, slightly plastic; many very fine, common fine, and few medium roots; many very fine and fin tubular pores; neutral (pH 7.2); abrupt wavy boundary. (3 to 4 inches thick)
A3--8 to 9 inches; dark brown (10YR 3/3) ashy silt loam, brown (10YR 5/3) dry; weak fine and medium subangular blocky structure; soft, very friable, slightly plastic; many very fine, common fine, and few medium roots; many very fine and few fine tubular pores; slightly alkaline (pH 7.5); abrupt broken boundary. (0 to 1 inch thick).
2Bg--9 to 18 inches; mixed light brownish gray (2.5Y 6/2) and light olive brown (2.5Y 5/4) silty clay loam, pale yellow (2.5Y 8/2) and pale yellow (2.5Y 7/4) dry; common fine distinct yellowish brown (10YR 5/4) and yellowish brown (10YR 5/6) redox concentrations; moderate very coarse prismatic structure parting to weak medium an coarse angular blocky; hard, firm, moderately sticky and moderately plastic; common very fine and few fine roots; many very fine and few fine tubular pores; few fine iron and manganese concretions; two 3-inch root channels of very dark grayish brown (10YR 3/2) silt loam; slightly alkaline (pH 7.8); clear wavy boundary. (6 to 10 inches thick)
2Bgk--18 to 35 inches; mixed light olive gray (5Y 6/2) and light olive brown (2.5Y 5/4) silty clay loam, pale yellow (5Y 8/2) and pale yellow (2.5Y 7/4) dry; many fine and medium prominent greenish gray (5GY 6/1) redox depletions and yellowish brown (10YR 5/6) and yellowish brown (10YR 5/8) redox concentrations; moderate very coarse prismatic structure parting to weak medium and coarse angular blocky; hard, firm, moderately sticky and moderately plastic; few very fine and fine roots; many very fine, fine, and common medium tubular pores; few fine manganese and many fine and medium iron stains; few medium irregular soft masses of lime, slightly effervescent; moderately alkaline (pH 8.0); clear irregular boundary. (15 to 20 inches thick)
3Cg--35 to 46 inches; light olive brown (2.5Y 5/4) silt loam, pale yellow (2.5Y 7/4) dry; many medium and coarse prominent gray (5Y 6/1) redox depletions surrounded by 3 mm bands of yellowish brown (10YR 5/6) iron stains; massive; hard, firm, slightly plastic; few very fine roots; many very fine and fine tubular pores; common fine manganese concretions and stains; moderately alkaline (pH 8.0); clear wavy boundary. (3 to 11 inches thick)
4Cgk--46 to 57 inches; light yellowish brown (2.5Y 6/4) silty clay, pale yellow (2.5Y 8/4) dry; many medium and coarse prominent gray (5Y 6/1) redox depletions, yellowish brown (10YR 5/6) and brownish yellow (10YR 6/6) redox concentrations; massive; very hard, very firm, very sticky and very plastic; common very fine roots along exterior of peds; many very fine and fine tubular pores; plates 1 to 2 mm thick due to varving; common medium manganese stains; many large irregular lime concretions, violently effervescent; moderately alkaline (pH 8.0); abrupt wavy boundary. (2 to 12 inches thick)
5Cg--57 to 60 inches; light olive brown (2.5Y 5/4) very fine sandy loam, pale yellow (2.5Y 7/4) dry; many medium and coarse prominent gray (5Y 6/1) redox depletions, yellowish brown (10YR 5/6) and brownish yellow (10YR 6/6) redox concentrations; massive; soft, friable, slightly plastic; common very fine and few fine tubular pores; common fine and medium manganese stains; moderately alkaline (pH 8.0); abrupt wavy boundary. (0 to 9 inches thick)
6Cgk--60 to 62 inches; light yellowish brown (2.5Y 6/4) silty clay, pale yellow (2.5Y 8/4) dry; common medium and coarse distinct light olive gray (5Y 6/2) redox depletions and brownish yellow (10YR 6/6) redox concentrations; very hard, very firm, very sticky and very plastic; common very fine and few fine tubular pores; common fine manganese stains; many fine and medium irregular lime concretions and soft lime masses, violently effervescent; moderately alkaline (pH 8.0); abrupt wavy boundary. (2 to 9 inches thick)
7Cg--62 to 65 inches; light olive brown (2.5Y 5/4) silt loam, pale yellow (2.5Y 7/4) dry; common medium and coarse distinct light olive gray (5Y 6/2) redox depletions and brownish yellow (10YR 6/6) redox concentrations; hard, firm, slightly sticky and slightly plastic; few very fine and fine tubular pores; common fine manganese stains; moderately alkaline (pH 8.0).
TYPE LOCATION: Bonner County, Idaho; approximately 1/2 mile north of Ponderay, Idaho, and state highway 200; 1,925 feet west and 2,750 feet north of the southeast corner, sec. 2, T. 57 N., R. 2 W.
RANGE IN CHARACTERISTICS:
Depth to seasonal water table February through June - .5 to 2.0 feet July through January - 2 to 2 feet
Solum thickness - 28 to 40 inches
Average annual soil temperature - 43 to 46 degrees F
Average summer soil temperature - 55 to 59 degrees F (without an O horizon)
A horizons
Color value, moist - 2 or 3
Value, dry - 4 or 5
Chroma, moist or dry - 2 or 3
Reaction - slightly acid to slightly alkaline
2Bg horizons
Color hue - 2.5Y or 5Y
Chroma, moist or dry - 1 to 4
Mottles, contrast - distinct to prominent
Chroma, moist - 1 to 8
Texture - silt loam or silty clay loam (18 through 34 percent clay)
Reaction - slightly alkaline to moderately alkaline
Soft lime masses - present in some pedons
Cg horizons
Color hue - 5Y, 5GY, 2.5Y
Value, moist - 5 or 6
Value, dry - 7 or 8
Mottles, contrast - distinct to prominent
Chroma, moist - 1 to 8
Texture - stratified silt loam, silty clay loam, silty clay and very fine sandy loam
Lime concretions - lacking in some pedons
COMPETING SERIES: This is the Esro series and the similar Hoodoo and Wrencoe series. Esro soils have a mollic epipedon more than 20 inches thick. Hoodoo soils are ashy. Wrencoe soils are in a fine family.
GEOGRAPHIC SETTING: Odenson soils are on low positions of terraces and adjacent to terrace drainageways and have slopes of 0 to 2 percent. Elevations range from 2,120 to 2,240 feet. The soils formed in glaciolacustrine sediments and a mantle of volcanic ash and loess. Average annual air temperature ranges from 43 to 45 degrees F; average annual precipitation ranges from 32 to 34 inches. The frost-free season is about 90 to 110 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Colburn, Mission, Pywell, Selle, and the competing Hoodoo and Wrencoe soils. Colburn and Mission soils are somewhat poorly drained. Pywell soils are formed in organic materials. Selle soils are sandy and well drained.
DRAINAGE AND PERMEABILITY: Poorly drained; runoff is very slow. Permeability is moderately slow in the solum and slow in the substratum.
USE AND VEGETATION: These soils are used mainly for hay, pasture, and grazing. A few areas are used for homesites. The natural vegetation is black cottonwood, quaking aspen, paper birch, Sitka alder, western redcedar, grand fir, and western larch with an understory of myrtle pachystima, northern twinflower, common princes pine, darkwoods violet, Idaho trillium, baldhip rose, and queencup beadlily.
DISTRIBUTION AND EXTENT: Northern Idaho. The soils of this series are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana
SERIES ESTABLISHED: Bonner County, Idaho, 1981.
REMARKS: 80 ID-017-5--1 to 9.