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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.
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Eastman tunnel
Collapsed tunnel in Minneapolis, Minnesota
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…Source: Wikipedia (CC BY-SA)
Minneapolis
City in Minnesota, United States
Minneapolis is a city in Hennepin County, Minnesota, United States, and its county seat. With a population of 429,954 as of the 2020 census, it is the state's most populous city. Located in the state's center near the eastern border, it occupies both banks of the Upper…Source: Wikipedia (CC BY-SA)
Mississippi River
Major river in the United States
The Mississippi River is the primary river of the largest drainage basin in the United States. It is the second-longest river in the United States, behind only the Missouri. From its traditional source of Lake Itasca in northern Minnesota, it flows generally south for 2,340 mi…Source: Wikipedia (CC BY-SA)
Saint Anthony Falls
Waterfall in Mississippi River into the Mississippi River Gorge in Minneapolis, Minnesota
Saint Anthony Falls, or the Falls of Saint Anthony, located at the northeastern edge of downtown Minneapolis, Minnesota, was the only natural major waterfall on the Mississippi River. Throughout the mid-to-late 1800s, various dams were built atop the east and west faces of the…Source: Wikipedia (CC BY-SA)