Draw Bridge from Essexville to Bay City

I remember going over this draw bridge...having to wait for the ships to pass through. We had to go over it to get pizza, which was my favorite thing in the world, and waiting for the draw bridge must stick out to me because it meant I was also having to wait for pizza... I remember wondering how the bridge worked. My parents told me there was a person who operated them but I didn't really think that was possible - they were heavy bridges....Then one time I saw an old man pop his head up out of his little booth and look at me. This is one of those memories that may or may not have happened - like the time I came across a smiley faced garden snake in a farm...