Nice site for Illinois - fairly clear except after rains. Lots of navigation and OW certs done here, not to mention other advanced certs. Has a deep section and other quarry machinery to dive through. Check out web site at www.Haighquarry.com. Mapquest give directions for listing under Haigh Enterprises. Easy to find with paved roads all the way. Concessions, showers, changing rooms. tank refills and dive service shop on site. Golf cart pick-up and delivery service for refills for extra $1. Concessions at quarry beach.