As iconic as it is structurally unviable, the existing Granite Island causeway will soon be decommissioned after the construction of a new causeway adjacent to it. Major works are expected to commence in March 2021 with the hope that this new link between Granite Island and the mainland at Victor Harbor would operate by the end of the year, in time for Christmas.
A significant percentage of the timber piles, bracing, crossheads and balustrade posts of the existing causeway have been assessed as being of poor condition. Their advanced deterioration now poses major safety issues. Much of the original structure had already been replaced over the years and further restoration would be unfavourable as current technical standards are hard to meet.
New causeway to be ten metres east of current alignment
Hence, a new causeway has been proposed. It will be constructed ten metres to the east of the current alignment with its height, appearance and simplicity remaining as similar as possible. It will provide improved pedestrian amenity and allow the historic horse-drawn tram operations to continue. A progressive system will be used to install a total of 82 steel piles and 82 precast concrete decks beginning from the mainland and moving towards the island. A fox gate will also be installed to protect the declining penguin colony.
Proposed new causeway (https://www.dpti.sa.gov.au/)