in 1970 a massive fire destroyed a large portion of the structure and the trains. The structure was rebuilt and replacement trains came from Dreamland
The Big Dipper closed as the result of a fatal accident on May 30th, 1972. The roller coaster was razed in 1973 and there are conflicting dates as to when.
The post accident, prior to demolition Big Dipper structure is seen extensively in the 1974 British-American science fiction/horror film The Mutations