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Stillwater-Swan Wooded Valley

Ecoregion in Rocky Mountains, MT

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The long Stillwater-Swan Wooded Valley ecoregion contains numerous wetlands and ponds and its forests are often dominated by western larch, Douglas-fir, or Engelmann spruce. The valley is much lower, drier, and warmer than the adjacent Salish Mountains (15l) and Canadian Rockies (41). Thick Quaternary alluvial and glacial drift deposits are characteristic and nonintegrated drainage and hummocky areas occur. The climax vegetation is mapped as Douglas-fir and grand fir forests, and is unlike the foothills grassland of the Flathead Valley (15c) and Tobacco Plains (15d). In the Swan River Valley, gravelly and droughty soils support Douglas-fir or Engelmann spruce climax forests while moister, finer textured soils have Engelmann spruce or subalpine fir climax forests. Logging and rural residential activity are the common land uses. Ecoregion 15t extends into Canada.

— EPA

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