There is no vehicle toll when crossing from Illinois to Iowa. There is a $2.00 toll to cross from Iowa to Illinois.
When a barge is approaching the bridge the bridge closes for vehicle and train traffic until the barge traffic passes. When you are in the line waiting for the barges it is called "Being Barged".
Well we've had that experience twice in the last couple of weeks. The wait time has been 15 - 30 minutes depending on when we arrive and when the barges are coming.
We were "Barged" a few days ago on a return trip from shopping in Burlington, IA. The wait was about 30 minutes. It was a nice day so the wait was pleasant. We definitely would not want to be on the bridge if the barge hit the bridge. You can see a barge passing under the bridge at this link - Ft. Madison Swing Bridge - Barge passing by.