The Eastman tunnel, also called the Hennepin Island tunnel, was a 2,000-foot-long (600 m) underground passage in Saint Anthony, Minnesota, dug beneath the Mississippi River riverbed between 1868 and 1869 to create a tailrace so water-powered business could be located upstream of Saint Anthony Falls on Nicollet Island. The tunnel ran downstream from Nicollet Island, beneath Hennepin Island, and exited below Saint Anthony Falls.
During construction of the Eastman tunnel in St. Anthony, Minnesota (now Minneapolis), the Mississippi River broke through the tunnel's limestone ceiling, nearly destroying Saint Anthony Falls.
On October 5, in the year 1869, During construction of the Eastman tunnel in St. Anthony, Minnesota (now Minneapolis), the Mississippi River broke through the tunnel's limestone ceiling, nearly destroying Saint Anthony Falls. This event is recorded as a Selected Events event in the history of October 5, one of 443 recorded events on this date across all of history.
Key Facts
- This event took place on October 5, 1869 (AD era).
- It is categorised as a Selected Events event in recorded history.
- Referenced in 4 Wikipedia articles.
- The event is associated with a specific geographical location (see map below).
- Wikipedia source last updated on 4 September 2026.
On This Date in History 443
This article draws on content from Wikipedia, available under CC BY-SA 4.0.
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