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Blue Mountain Basins

Ecoregion on Columbia Plateau, OR

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The Blue Mountain Basins ecoregion includes the Wallowa, Grande Ronde, and Baker valleys. All three valleys are fault- bounded grabens or depressions filled with sediments. The Wallowa and Grande Ronde valleys have a marine-moderated climate and moisture retaining loess soils. The Baker Valley, located in the rainshadow of the Elkhorn Mountains, is drier and has areas of alkaline soil. All three valleys receive stream flow from the surrounding mountains. Most of the floodplain wetlands have been drained for agriculture, but a remnant exists in the Grande Ronde Basin at Ladd Marsh National Wildlife Refuge.

— EPA

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Ecoregion