LOCATION TENDOY IDEstablished Series
TAXONOMIC CLASS: Euic, frigid Typic Haplosaprists
TYPICAL PEDON: Tendoy muck - on a nearly level floodplain under sedge and grass vegetation at 4,690 feet elevation. (Colors are for moist soil unless otherwise noted.)
C--0 to 2 inches; very dark grayish brown (2.5Y 3/2) silt loam, grayish brown (10YR 5/2) dry; weak fine platy structure; soft, very friable, slightly sticky and slightly plastic; many very fine, fine and medium roots; many very fine irregular pores; slightly effervescent; slightly alkaline (pH 7.7); abrupt smooth boundary. (0 to 3 inches thick)
Oa1--2 to 7 inches; black (N 2/) on broken face and rubbed, sapric material; about 10 percent fibers, about 5 percent after rubbing; weak medium granular structure; many very fine, fine, and medium roots; slightly effervescent; slightly acid (pH 6.4); abrupt smooth boundary. (3 to 10 inches thick)
Oa2--7 to 10 inches; black (10YR 2/1) on broken face and rubbed, sapric material; about 30 percent fibers, about 10 percent after rubbing; structureless, many very fine, fine, and medium roots; neutral (pH 7.0); gradual smooth boundary. (2 to 6 inches thick)
Oa3--10 to 15 inches; black (N 2/) on broken face and rubbed, sapric material; about 25 percent fibers, about 5 percent after rubbing; structureless; common very fine, fine, and medium roots; slightly acid (pH 6.5); abrupt smooth boundary. (4 to 15 inches thick)
Oa4--15 to 19 inches; black (N 2/) on broken face and rubbed, sapric material; about 25 percent fibers, about 10 percent after rubbing; structureless; common very fine, fine, and medium roots; slightly acid (pH 6.5); abrupt smooth boundary. (3 to 10 inches thick)
Oa5--19 to 23 inches; black (10YR 2/1) on broken face and rubbed, sapric material; about 30 percent fibers, about 15 percent after rubbing; structureless; common very fine, fine, and medium roots; neutral (pH 6.6); abrupt smooth boundary. (2 to 8 inches thick)
Oa6--23 to 41 inches; black (N 2/) on broken face and rubbed, sapric material; about 10 percent fibers, less than 5 percent after rubbing; structureless; few very fine, fine, and medium roots; slightly acid (pH 6.1); clear smooth boundary. (5 to 25 inches thick)
Oa7--41 to 47 inches; black (N 2/) on broken face and rubbed, sapric material; about 10 percent fibers, less than 5 percent after rubbing; structureless; few very fine roots; moderately acid (pH 5.6); abrupt smooth boundary. (0 to 10 inches thick)
Oa8--47 to 60 inches; black (N 2/) on broken face and rubbed, sapric material; about 5 percent fibers, less than 5 percent after rubbing; structureless; few very fine roots; moderately acid (pH 6.0).
TYPE LOCATION: Bannock County, Idaho; about 4 miles west and 1.5 miles north of Downey; 2,450 feet south and 800 feet east of the northwest corner of section 24, T. 11 S., R. 36 E.
RANGE IN CHARACTERISTICS:
Depth to high water table - +6 inches to 6 inches below the surface Organic layers - more than 60 inches thick, predominantly sapric but some pedons have small amounts of hemic and/or fibric material Mineral layers - generally a thin mineral layer of recent alluvium is on the surface, also thin discontinuous layers are present in the subsurface and bottom tiers of some pedons
Average annual soil temperature - 42 to 46 degrees F.
Effervescence - the upper part of the surface tier is slightly effervescent, there also may be layers in the subsurface and bottom tiers that are slightly effervescent
Surface tier
Mineral soil
Color hue - 10YR, 2.5Y or neutral
Value, moist - 2 through 5
Value, dry - 3 through 6
Chroma, moist or dry - 0 through 3
Organic soil
Color hue - 10YR, 5Y or neutral
Value, moist - 2 or 2.5
Chroma, moist - 0 through 2
Reaction - slightly acid to slightly alkaline
Subsurface tier:
Color hue - 10YR or neutral
Chroma, moist - 0 through 2
Reaction - slightly acid or neutral
Subsurface tier:
Color hue - 10YR or neutral
Chroma, moist - 0 through 2
Reaction - medium or slightly acid
COMPETING SERIES: These are the Bucksport, Lupton, Pywell, and Seeleyville series. Lupton soils contain up to 30 percent woody fragments and lack calcium carbonate in the upper part of the surface tier. Pywell soils have thin layers of volcanic ash, contain up to 35 percent woody material, and lack calcium carbonate in the upper part of the surface tier. Seeleyville soils lack calcium carbonate in the upper part of the surface tier. Bucksport soils are extremely acid to strongly acid in the surface tier and extremely acid to moderately acid in the subsurface tier.
GEOGRAPHIC SETTING: Tendoy soils are on floodplains. Slopes range from 0 to 1 percent. They formed in material derived from herbaceous plants. Average annual precipitation ranges from 12 to 16 inches. Average annual temperature ranges from 41 to 45 degrees F. Frost-free season is about 80 to 100 days. Elevation ranges from 4,550 to 4,750 feet.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bear Lake, Downata (T) and Inkom (T) soils. Bear Lake and Inkom are mineral soils. Downata is a mineral soil but may have thin buried organic layers. These soils are also on floodplains but occupy slightly higher positions and have better drainage.
DRAINAGE AND PERMEABILITY: Very poorly drained; runoff is very slow or ponded; permeability is moderate. These soils are frequently flooded from January through June for brief periods of about 3 to 5 days.
USE AND VEGETATION: Used mainly for meadow hay and pasture. Most Tendoy soils have been drained so that hay can be harvested. Potential natural vegetation is grasses, sedges, rushes, and other water loving plants.
DISTRIBUTION AND EXTENT: Southeastern Idaho. This series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Bannock County, Idaho, 1983.