Level IV (4c) Cascade Crest Montane Forest
The Cascade Crest Montane Forest ecoregion consists of an undulating plateau punctuated by volcanic buttes and cones that reach a maximum elevation of about 6,500 feet (1,981 m).
Volcanism in the Pliocene epoch overtopped the existing Miocene volcanics of the Western Cascades Montane Highlands. Later, Pleistocene glaciation left numerous rock-basin lakes throughout the plateau. Sinuous, medium gradient streams cross the subdued, glaciated terrain.
The region is extensively forested with mountain hemlock, Pacific silver fir, and subalpine fir, with some grand fir, noble fir, Douglas-fir, Englemann spruce, and lodgepole pine, and an understory of vine maple, huckleberry, rhododendron, beargrass, twinflower, and wintergreen. Mountain meadows support sedges, dwarf willows, and tufted hairgrass.
The region covers 1,909 square miles (4,944 km2) in Oregon and 310 square miles (803 km2) in Washington, running along the spine of the Cascades; an isolated pocket of this ecoregion can be found on Newberry Volcano southeast of Bend.