My next stop was in Marine City. We dilly dallied too long in Port Huron to catch the Blough in St. Clair although we didn't miss her by much. So I figured I would head up the road a bit and catch her in Marine City.
As I was waiting for the Blough, I saw this cannon and took a picture of it. It looks like it may be a 5 inch deck gun from a submarine but I'm not sure.