Illini Hunting Camp Site, Near the Slough While reviewing a map of native sites for the area west of the Little Calumet, I discovered that I had, on accident, already photographed a location that was frequently used as a camp site by the Illini. These are shots that I took 'in passing' while looking for the entrance to the CSX yard in Riverdale (on the last day of my 27th year, oddly enough).