Cascades Volcano Observatory, Vancouver, Washington

Mount Jefferson, Oregon

Jefferson84_mount_jefferson_from_east_10-06-84.jpg Mount Jefferson, Oregon, as seen from the east. USGS Photograph taken on October 5, 1984, by Lyn Topinka. [medium size] ... [large size] ... [TIF Format, 25 M] ...

• Mount Jefferson Volcano
  -- Geographic Setting, Geologic and Eruptive History
  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. -- Excerpt from: Walder, et.al., 1999

• 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. -- Excerpt from: Walder, et.al., 1999

• Mount Jefferson Wilderness and Warm Springs Indian Reservation
  Mount Jefferson is located in the Mount Jefferson Wilderness area and the Warm Springs Indian Reservation, approximately 115 kilometers (70 miles) southeast of Portland, Oregon, and 80 kilometers (50 miles) northwest of Bend, Oregon. Highway 22 east of Salem, Oregon, provides access to Forest Service roads and trails which lead into the wilderness area. -- Excerpt from: Richard M. Conrey, 1990, IN: Wood and Kienle

[Map,20K,InlineGIF]
Major West Coast Volcanoes - Washington, Oregon, and California

[Map,15K,InlineGIF]
Mount Jefferson, Three-Fingered Jack, and Vicinity

• Deschutes National Forest and Willamette National Forest -- U.S. Forest Service websites, scroll to desired Forest
• MORE Useful Sites -- CVO Menu, includes links to Volcano Info, Seismicity, Hydrology, etc.

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