Contact Info
Missouri River Institute
The University of
South Dakota
414 E. Clark Street
Akeley-Lawrence
Science Center
Vermillion, SD 57069
Email: info@mnrrwatertrail.org

Financial support for website development provided by the
Living River Group
of the
Sierra Club

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Site Description: 

Lewis & Clark passed by this site in 1804, while on their way up the Missouri River. As they traveled past, smoke could be seen rising from the bluffs, and were convinced that this was the remnants of an old volcano. J.N. Nicollet would blame the smoke not on volcanic activity, but instead on beds of iron pyrite interacting with water. Settlers continued to fear the "volcano" until 1878, when the Missouri River flooded and a large chunk of the bluff fell into the river. Today, the Missouri River no longer flows against the bluffs and smoke no longer rises.

Indian Hill Archeological Site
Web Link http://www.nebraskahistory.org/publish/markers/texts/ionia_volcano.htm