Mount Jefferson is a stratovolcano in the Cascade Volcanic Arc, part of the Cascade Range, and is the second highest mountain in Oregon. Situated in the far northeastern corner of Linn County on the Jefferson County line, about 105 miles (169 km) east of Corvallis, Mount Jefferson is in a rugged wilderness and is thus one of the hardest volcanoes to reach in the Cascades; though USFS Road 1044 does come within 4 miles (6.4 km) of the summit. The lower reaches of the mountain's north side also extend into southeastern Marion County, although its summit does not. Jefferson's craggy, deeply glacially scarred appearance is especially beautiful and photogenic, and the peak has frequently served as a backdrop for automobile and alcohol advertisements in the United States. Mount Jefferson (originally called Mount Vancouver by the British) was named in honor of US President Thomas Jefferson by the Lewis and Clark Expedition. This was the only High Cascade mountain they named. The expedition, which was sponsored by President Jefferson, first saw the peak from the mouth of the Willamette River in March 1806. A Native American name for the mountain is Seekseekqua.
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