Mount Jefferson, Oregon, taken from the east
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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
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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
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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
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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.
-- Excerpt from: Wood and Kienle, 1990, Volcanoes of North America:
United States and Canada: Cambridge University Press, 354p.,
p.177-178, Contribution by Richard M. Conrey
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[Map,20K,InlineGIF]
Major West Coast Volcanoes - Washington, Oregon, and California
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[Map,15K,InlineGIF]
Mount Jefferson, Three-Fingered Jack, and Vicinity
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Deschutes National Forest
-- Link courtesy U. S. Forest Service
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Willamette National Forest
-- Link courtesy U. S. Forest Service
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Mount Jefferson Menu
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