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Casper Arch

Ecoregion in Rocky Mountains, WY

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The Casper Arch ecoregion is a transitional region between the Northern Great Plains (43) and the Wyoming Basin (18). Soils are weathered from sodic Cody shale; they are generally well drained to slowly permeable, and are moderately to very shallow. Soils can be saline and strongly alkaline, which limits vegetation growth more than the low annual precipitation of 10 to 14 inches. Potential natural vegetation is mainly Gardner saltbush, western wheatgrass, bluebunch wheatgrass, Indian ricegrass, birdfoot sagebrush, and Sandberg bluegrass. Livestock grazing and wildlife habitat are the common land uses.

— EPA

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Ecoregion