We had an old decommissioned rock quarry that seems pretty similar to this place. I think the state owned it, so there wasn't an entry fee or any waiver signing. There was a shit ton of teenagers getting wasted, fighting and occasionally drowning. They finally shut it down just because people would constantly trash the place. I think they still use it for scuba training, and at the bottom there is a bunch of vehicles people drove in and old excavation equipment.
I was just reading/watching that the quarry from the movie Breaking Away just outside of Bloomington was recently filled 2/3 of the way in due to the occasional person getting hurt and beer cans getting left around. This place was a swimming hole used for generations. Even the local sheriff said he swam in it as a kid.