What year did the park that Spacely's Sprocket Rockets is located open?
Spacely's Sprocket Rockets: Spacely's Sprocket Rockets is a steel roller coaster located at Six Flags Great America in Gurnee, Illinois. Six Flags Great America: Six Flags Great America is a Six Flags amusement park located at Gurnee, Illinois, in the Chicago metropolitan area. Six Flags Great America:  It first opened in 1976 as Marriott's Great America.
1976