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Global Volcanism Program | Image GVP-03009

Mount Jefferson, a prominent landmark of the central Oregon Cascades, rises above deep canyons cut into thick lava flows of the Columbia River Basalt formation NE of the volcano.  Mount Jefferson was named after the current president when it was observed by Lewis and Clark from the mouth of the Willamette River in 1804. Photo by Richard Waitt, 1984 (U.S. Geological Survey).

Mount Jefferson, a prominent landmark of the central Oregon Cascades, rises above deep canyons cut into thick lava flows of the Columbia River Basalt formation NE of the volcano. Mount Jefferson was named after the current president when it was observed by Lewis and Clark from the mouth of the Willamette River in 1804.

Photo by Richard Waitt, 1984 (U.S. Geological Survey).


Jefferson