Idaho State Soil - Threebear

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.


 

Threebear Soil Profile

Threebear Series

Ashy over loamy, mixed, frigid Alfic Udivitrands

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

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