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Dry Intermontane Sagebrush Valleys

Ecoregion in Rocky Mountains in ID, MT

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The Dry Intermontane Sagebrush Valleys ecoregion contains stream terraces, floodplains, saline areas, and alluvial fans. Water availability and potential for cropland agriculture are low because Ecoregion 17aa is in the rain shadow of high mountains, receives little mountain runoff, and is underlain by highly permeable valley fill deposits. Its deep gravels are unlike the basalts of Ecoregion 12. Sagebrush grassland is widespread and contrasts with the open-canopied forests of the more rugged and higher Ecoregion 17e. Shadscale and greasewood grow on alkaline soils that receive less than 8 inches of precipitation annually. Grazing is the dominant land use. Both the Pahsimeroi and Lemhi rivers were once important salmon and steelhead fisheries.

— EPA

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