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Deer Lodge-Philipsburg-Avon Grassy Intermontane Hills and Valleys

Ecoregion in Rocky Mountains, MT

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The Deer Lodge-Philipsburg-Avon Grassy Intermontane Hills and Valleys ecoregion lies west of the Continental Divide and is composed of stream terraces, foothills, and floodplains. Ecoregion 17ak is farmed, grazed, and used for urban, suburban, and industrial activity. Ecoregion 17ak includes the settling ponds near the Anaconda smelter site and a downstream section of the Clark Fork that has high concentrations of heavy metals. The climate is wetter than the Dry Intermontane Sagebrush Valleys (17aa) to the south, drier than the Bitterroot-Frenchtown Valley (17s), and less continental than the Townsend Basin (17w) to the east. The potential natural vegetation is mapped as foothills prairie and is distinct from the forests of the nearby Northern Rockies (15) and the sagebrush steppe of the Big Hole (17ac) and Dry Intermontane Sagebrush Valleys (17aa).

— EPA

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