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
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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