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Salish Mountains

Ecoregion in Rocky Mountains, MT

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The Salish Mountains ecoregion is forested and underlain by Precambrian Belt rocks. Its volcanic ash-mantled crests rarely exceed an elevation of 7,000 feet and lack the alpine zones that occur in higher mountains. Average precipitation is about 20 to 50 inches per year and is markedly lower than that of the Purcell – Cabinet – North Bitterroot Mountains (15q) and the Canadian Rockies (41). Ecoregion 15l’s northern portion receives more precipitation than the southern; it was glaciated by the Cordilleran ice sheet which modified physiography and deposited till. Till deposits influence slope hydrology and perennial streams are, therefore, more numerous in the glaciated north than in the unglaciated south. Extensive logging and recreation are the common land uses. Ecoregion 15l extends into Canada.

— EPA

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