Threebear -- Idaho Soil

Photograph within an open coneferous forest. Ground cover cosists of sapling tree regeneration, low shrubs, forbs and grasses.

Photograph of a profile of a typifying pedon of Threebear soil series

Threebear Soil Profile

Surface layer: yellowish brown silt loam
Subsoil - upper: light yellowish brown silt loam
Subsoil - middle: very pale brown silt loam
Subsoil - lower: a very firm and brittle fragipan of yellowish brown silt loam
The Threebear series consists of moderately well drained soils formed in silty sediments with a thick mantle of volcanic ash. These soils are moderately deep to a fragipan. The name “Threebear” is derived from a creek in Latah County, Idaho. These soils are on hills with slopes of 5 to 35 percent.

Threebear soils are used mainly for timber production and wildlife habitat. The potential natural vegetation is western redcedar, grand fir, Douglas-fir, western larch, and western white pine. The average annual precipitation is about 36 inches, and the average annual temperature is about 42 degrees F.

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