Devil's Millhopper Geological State Park 4732 Millhopper Road Gainesville, Florida ... 120 feet deep sinkhole the grand daddy of all Florida sinkholes. exposing limestone layers that date back 34 million years. ... 1974 the state park system began to manage the site and installed 236 steps to the bottom. that number was reduced to 132 steps after hurricane Irma (2017 ) . park closed from 2017 until 2019 for repairs. ... 1971 when Millhopper was unencumbered by fences, gates and steps. my dorm mates and I decided to take a break from studying for exams and visit the site after midnight with flashlights in hand. I tripped and slid about 20 feet down the ravine before catching onto some tree roots. my flashlight made it all the way to the bottom. ... scratched ,bruised and sore at least the HOT light was on at Krispy Kreme. so not a wasted trip.