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Dominantly plains and foothills with some terraces and fans that formed in sandstone and shale. Elevations range from 2900 to 6000 feet. Drainage density is moderate.
Mean annual precipitation ranges from 12 to 20 inches, about 35 percent falling as snow. The soil temperature and moisture regimes are frigid and tyic ustic/aridic ustic. Chinook winds are frequent.
Grama-needlegrass-wheatgrass and Foothills prairie. Some Eastern ponderosa forest also occurs at higher elevations.
Landform | Geology | Soil Taxa |
---|---|---|
Plains/foothills | Sandstone/shale | Ustorthents/Haploborolls/Argiborolls/Haplargids |
Terraces/fans | Alluvium | Calciorthids/Argiborolls |
The primary natural disturbance is drought. Land use is predominantly livestock grazing with some dryland farming.