From the record
“Hardy Dam is an earth-filled embankment dam and powerplant complex on the Muskegon River in Big Prairie Township, Newaygo County, Michigan. At the time of its completion, it was the largest earthen dam in North America east of the Mississippi.”
Wikipedia article Hardy Dam, CC BY-SA 4.0.
One of 3 National Register listings published here for Newaygo County · listed in 1997 · category: Structure.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service
