Does anyone know of any bike trails along the Mississippi River in Illinois?

I have some information about the Great River Trail system, that follows the Mississippi River from Minnesota to Louisanna. When I checked into that a couple of years ago, significant portions of that "trail" were highways that ran along the river. But they had announced plans to complete some bike paths along portions of the trail system.

Does anyone know if any of those paths are now open? I'm looking for something that is at least 15-20 miles long, so one could take a 30-40 mile ride down and back, without having to ride on a road.