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Mountainsides, foothills, terraces, moraines, and fans that formed in Tertiary volcanics and mixed sedimentary rocks. Continental glaciation influenced these mountain ranges. Elevations range from 2500 to 5500 feet. Drainage density is moderate.
Mean annual precipitation ranges from 16 to 30 inches, about 70 percent falling as snow. The soil temperature and moisture regimes are frigid (cryic at higher elevations) and typic ustic. Chinook winds are common.
Douglas-fir forest at higher elevations with Foothills prairie on foothill and lower elevations.
Landform | Geology | Soil Taxa |
---|---|---|
Mountainsides/moraines | Till/volcanics/mixed sedimentary | Cryoborolls/Cryoboralfs/Cryochrepts |
Foothills | Volcanics/sedimentary | Haploborolls/Paleboralfs |
Terraces/fans | Mixed sedimentary | Argiborolls/Haploborolls |
The primary natural disturbance is fire. Land use is predominantly livestock grazing and some timber harvest.