Mountain Creek Waterpark is a water park located in Vernon, New Jersey, United States, on the grounds of the Mountain Creek ski resort. The park consists primarily of water-based attractions and opened in 1998. Its predecessor, Action Park, one of the first modern American water parks, was open from 1978 until 1996 and became infamous for its consequently poor safety record. At least six people are known to have died as a result of mishaps on rides at the original park. Despite this, the park was very popular and attracted thrill-seekers from across the New York metropolitan area.