I had a buddy that lived in Streator and his duck hunting up there was limited. I know by Starved Rock on the Illinois river there are some blind areas, but I'm pretty sure they draw in the summer for them. Now if the blind isn't occupied by a certain time then it's first come first serve, but I wouldn't want to take a chance on that. You've got Clinton not too far off and to be honest I don't know anything about it. It might be closed during waterfowl season as a resting area, but I don't know.
I know I haven't been much help, but if ya ever make it down to the southern half of the state (the good half) drop me a line we might be able to work out a hunt. Also, post up in the Illinois forum, you'll be talking to those who know.