Carowinds is a 407-acre (165 ha) amusement park located adjacent to Interstate 77 in Charlotte, North Carolina. The park straddles the North Carolina-South Carolina state line, with a portion of the park located in Fort Mill, South Carolina. However, it has an official Charlotte address, and its business offices are located on the Charlotte side of the park. The park opened on March 31, 1973, at a cost of $70 million. It is the result of a four-year planning period spearheaded by Charlotte businessman Earl Patterson Hall. Owned and operated by Cedar Fair, Carowinds also features a 27-acre (11 ha) water park, Carolina Harbor, which is included with park admission. The park has a Halloween event called SCarowinds and a winter event called WinterFest.