It runs from Interstate 74 (I-74) in East Peoria north to IL 78 at Mt.

On the other side of the river, Illinois 40 is briefly called Washington Street.

It then is routed onto an onramp to Interstate 74, where there is an exit to Camp Street before terminating at I-74.

Prior to 2003, the Illinois 40 exit on I-74 southeast of Peoria was called "Industrial Spur".

As part of the Upgrade 74 Project, the exit was renamed by the Illinois Department of Transportation to Riverfront Drive.