The Mount Jefferson Wilderness is a wilderness area located on and around Mount Jefferson in the central Cascade Range of Oregon in the United States. It is situated where the Willamette, Deschutes, and Mount Hood National Forests meet. Mount Jefferson Wilderness is the second most visited Oregon wilderness area after the Three Sisters Wilderness.At 10,497 feet (3,199 m), Mount Jefferson is the second tallest mountain in Oregon. It is a stratovolcano with slopes mantled by five glaciers - Whitewater, Waldo, Milk Creek, Russell, and Jefferson Park. Three Fingered Jack is a heavily eroded and deeply glaciated shield volcano and consists mainly of basaltic andesite lava.[2] At 7,841 feet (2,390 m), it is made up of the solidified lava plug flanked by ridges of the old volcano's subsidiary lava dikes and lies at the southern end of the Mount Jefferson Wilderness. Other geographic features of the wilderness include steep talus slopes, rock outcrops, and alpine meadows. Marion Lake is situated within the wilderness area.
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