This drawing shows the a cross section of a canal used to feed water through turbines to generate power. The tunnel was embedded in the limestone near St. Anthony Falls with a base of concrete and shell of masonry. See also umn191811.
Contributing Institution:
Hennepin County Library, James K. Hosmer Special Collections Library
This drawing shows the condition of Minneapolis Mill Company's dam and mill pond in regards to the build-up of silt and debris from the previous winter near St. Anthony Falls.
Contributing Institution:
Hennepin County Library, James K. Hosmer Special Collections Library
This drawing was done in the aftermath of October 5, 1869, Eastman Tunnel collapse. A tunnel connecting Nicollet and Hennepin islands collapsed on that day causing the need for considerable repair to be done to Hennepin Island and St. Anthony Falls. The repair work was finished in 1884, creating a protective apron over the falls.
Contributing Institution:
Hennepin County Library, James K. Hosmer Special Collections Library