Historical Marker
Across the Water
Historical marker location:
25000 East River Road, Grosse Ile, Michigan
( Marker is at the intersection of East River Road and Grosse Ile Parkway, on the right when traveling south on East River Road.)
to Stony Island and Beyond.
The Upper Peninsula of Michigan was once a major center for copper mining. The Keweenaw Peninsula was home to the largest concentration of copper mines in the world in the mid-19th century, and copper was an important natural resource for the state's economy.