These maps offer a simplified representation of forest types in Oregon. The spruce-hemlock forests along the Pacific Coast give way to the Douglas-fir zone that surrounds the Willamette Valley and extends well into the Cascades. Growing above 4,500 feet in the Cascade, Siskiyou and Wallowa mountains are the subalpine forests, a combination of several tree species. Mixed-conifer forests are found in southwestern Oregon and, although dominated by conifers, contain hardwoods as well. The forests of the drier east side of Oregon are primarily ponderosa and lodgepole pine, with mixed conifers.
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