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Mesic Forest Zone

Ecoregion on Columbia Plateau in OR, ID, WA

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The Mesic Forest Zone is found between 4,000-7,000 feet in the western Wallowas, the western Seven Devils Mountains, and the higher elevation Blue Mountains. These areas are influenced by marine air coming through the Columbia River Gorge to the west. Much of the ecoregion’s precipitation falls as snow that persists late into the spring. The soil has a significant ash layer that is relatively rock free and that also helps to retain moisture during the dry season. The result of these factors is a highly productive and diverse forest community that includes true firs and Engelmann spruce.

— EPA

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