allow access to the sink for visitors without further soil erosion. The boardwalk was damaged by Hurricane Irma in September 2017, and closed to the public. The damaged boardwalk was replaced with a 132-step structure that ends higher in the sinkhole than the old one did. The path into the sinkhole reopened to the public on June 5, 2019. The formation was designated a National Natural Landmark in 1974, and was listed on the National Register of Historic Places (in part for its surviving Civilian Conservation Corps infrastructure) in 2017. See also Florida State Parks in Alachua County List of sinkholes of the United States National Register of Historic Places listings in Alachua County, Florida References External links Devil's Millhopper State Geological Site at Florida State Parks Devil's Millhopper State Geological Site at Absolutely Florida Devil's Millhopper State Geological Site at Wildernet Devils's Millhopper from a Visitor's Perspective Parks in Alachua County, Florida State parks of Florida National Natural Landmarks in Florida Protected areas established in 1974 Tourist attractions in Gainesville, Florida Geography of Gainesville, Florida Landforms of Alachua County, Florida Sinkholes of Florida 1974 establishments in Florida National Register of Historic Places in Alachua County, Florida