You sure come up with nice pictures R R. I lived in Illinois for many yrs and 35 yrs ago I "Escaped" from there and moved to Minnesota.....what a difference!
I work in Danville and found this old post so I decided to do some research. Result.....I found where this area is located. Planning a trip there very soon to see if I find anything. Pavilion was torn down a long time ago and area floods often with big rains. But if time or the city hasn't changed things there should be a chance to find some good stuff.