Rescuers have freed 20 people trapped on a chairlift at Adventure World.
After almost three hours, the last of them was rescued, with 12 firefighters using a cherry picker to free the stranded patrons.
Department of Fire and Emergency Services workers were called to the Bibra Lake theme park at 12.43pm after the chairlift stopped.
Rescuers freed the first two people at 1.22pm and by 2.30pm, eight people had been freed.
Twelve firefighters used a cherry picker to free the trapped people.
The trapped riders have been given water while rescuers work to free them by 4pm.
The Sky Lift is described on the Adventure World website as a ride for all the family that gives a spectacular view of the park and across the city.
In November, the castle structure at the theme park was damaged by fire. A spokesman for the Department of Fire and Emergency Services estimated damage at $500,000.
No guests were in the park at that time.