Former M-146 Route Maps
1956 Route Map
Below is a route map showing M-146 as depicted on a Michigan State Highway Dept General Highway Map of St. Clair Co from 1956. Jump to 1964 Route Map.
1964 Route Map
Below is a route map showing M-146 and other state trunkline routes—both existing and proposed—in the Port Huron and Marysville areas as of 1964. Jump to 1956 Route Map.
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Back to Former M-146 Route Listing.