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M332Gd Snake River Mountains and Canyonlands

Landscape Characteristics:

Steep, dissected mountains and stream breaks that formed in basalt, limestone, slate, and minor amounts of granite. Most of the higher elevation lands were glaciated. Elevations range from 1000 to 9400 feet. Drainage density is low to moderate.

Climate:

Mean annual precipitation ranges from 15 to 45 inches, about 70 percent falling as snow in the higher elevations. The soil temperature and moisture regimes are mesic and typic xeric (cryic and udic at higher elevations).

Potential Vegetation:

Western ponderosa forest/Grand fir-Douglas-fir forest/Wheatgrass/bluegrass

Relationships of Dominant Map Unit Components:

Landform Geology Soil Taxa
Cirqueland/moraines Till/basalt Cryochrepts/Cryumbrepts
Mountainsides/breaks Colluvium/loess/basalt Argixerolls/Haploxerolls

Disturbance and Land Use:

The primary natural disturbances are fire, insects and disease, and mass wasting. Land use is predominantly livestock grazing, timber harvest, and recreation.