Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.

Photographer: J.T. Lambrou
Taken: September 21, 2021
Caption: Mio Hydro Marker
Additional Description: Inset photo (middle left) caption: Mio Dam was designed with a conduit or under-sluice spillway, which was designed and patented by engineer William W. Tefft. The spillway was constructed within and under the powerhouse instead of the traditional design where the spillway is located adjacent to the powerhouse, as seen in earlier constructed dams on the Au Sable River such as Five Channels Dam. This photograph shows the construction of the under sluice conduit, as well as the turbine pits.
Submitted: September 23, 2021, by J.T. Lambrou of New Boston, Michigan.
Database Locator Identification Number: p611962
File Size: 1.809 Megabytes

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