Very cool bridge and it's really neat that your father helped construct them. I've been through Michigan (via I-90) but never on this one. My oldest brother use to work bridge construction for a couple of years in Massachusetts, never seen his work as I live in Iowa.
There are some great bridges between where I am in Wisconsin and where you are in Iowa! Is your brother an operating engineer? Ironworker?
I think he was an iron worker back when he did bridges. He does crane work on buildings now I think, about ready to retire. He's my half brother we haven't talked in quite some time.
Oh yes some nice bridges over the Mississippi River on the eastern side of Iowa and some on the western side with the Missouri River 😊 If I get some time before Sunday I'll post about a walking bridge that connects Council Bluffs, IA to Omaha, NE across the Missouri River here.