I am amazed that you can still find places like this, relatively unspoiled and undiscovered, two hours away from Chicago.
This swimming hole is located in Illinois Canyon, one of the many canyons in Starved Rock State Park, that has been carved by glacial melting. Illinois Canyon is the least explored and relatively untouched canyons of Starved Rock. There are no organized trails to reach this particular swimming hole but locals and intrepid adventurers can surely reach this area by climbing a rock face and then hiking a short unmarked trail.
Unlike other canyons in the park, this one is not crowded at all.