Looks like a great plan!
If you are open to suggestions, I'd like to suggest heading slightly north from your planned Mississippi River crossing to Dorena, Missouri where you can for $5 per bike cross the Big Muddy by ferry to Hickman, Kentucky.
Maybe not a big deal in the overall scope of you trip, but a nice little look back to the time before steel bridges crossed the waters.
In Hickman , find the Kentucky Kernal to try some wild shelled pecans. The wild ones are much smaller, more delicate and more flavorful than the commercial varyities.
Anyway this reroute doesn't take you far off your original plan,but , it does get you into the great state of Kentucky.
Oh, the ferry is closed right now due to high water on the Mississippi , but it won't stay high forever.
RR's Catnip Hill to Peoria ___Loopin' Seattle to WestFest
It started with some beers __1500 miles to the Dentist
Skeedaddle to Seattle______ A 30 year old on a Three Flags Run