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U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Lassen Peak is one of the largest plug dome volcanoes in the world. It is also considered to be one of the most probable areas for renewed volcanic activity in the lower 48 states. Lassen Peak's last erupted in 1914. Lassen Peak is just one of many examples of the Byway's volcanic legacy.
Public Domain. Courtesy of Siskiyou County Visitors Bureau
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