Mount Jefferson

Mount Jefferson is located in the Mount Jefferson Wilderness area and the Warm Springs Indian Reservation, approximately 115 kilometers souteast of Portland, Oregon, and 80 kilometers northwest of Bend, Oregon. Highway 22 east of Salem, Oregon, provides access to Forest Service roads and trails with lead into the wilderness area.

Mount Jefferson is a prominent feature of the landscape seen from highways east and west of the Cascades. Mount Jefferson (one of thirteen major volcanic centers in the Cascade Range) has erupted repeatedly for hundreds of thousands of years, with its last eruptive episode during the last major glaciation which culminated about 15,000 years ago

Lava Flows:
The youngest lava flows in the Mount Jefferson area are basaltic lava flows from Forked Butte and an unnamed butte south of Bear Butte. Both of these flows postdate the large eruption of Mount Mazama (Crater Lake) of about 7,600 years ago.