The South Australian Government has announced a major $17.3 million upgrade to the Patawalonga Lake System, primarily focused on the south gates, to enhance flood management and maintain the health of the marine environment. This initiative aims to mitigate flooding risks around critical areas like the airport and Glenelg.
The current system, stretching 1.6 kilometres, diverts urban stormwater to the sea through the Barcoo Outlet. It utilizes the natural tides to refresh the lake with seawater. A significant element of the project is the replacement of all eight steel gates along with their lifting components and electronic control system which have reached the end of their serviceable life. The new installation involves stainless-steel gates designed to last up to 50 years with minimal need for major refurbishment.
The project will proceed with the replacement of two gates at a time to ensure the continued functionality of the system. Deputy Premier and Minister for Climate, Environment and Water, Susan Close MP, highlighted the critical nature of the upgrades. “It is important to upgrade the gates to modern-day standards to ensure ongoing safe, effective, and reliable operation of the Patawalonga Lake System,” she stated.
The gates play a pivotal role in the environmental health of the lake, being opened twice a day on a rising tide to allow fresh seawater to circulate, fully replacing the lake volume every three to four days. This process ensures a vibrant marine setting suitable for activities such as boating, fishing, and kayaking. Close said, “The gates help provide calm waters within the lake, providing ideal kayaking conditions and an important refuge for the local population of bottlenose dolphins, which come here to feed and rest.”
During the upgrade, the concrete barrage currently used by pedestrians and cyclists to traverse the Patawalonga will be closed. However, a temporary walkway will be established on the western side to facilitate pedestrian access. The ongoing construction will intermittently affect access to the boat lock and walkways. These disruptions will be managed carefully to occur primarily outside peak usage periods to minimise community inconvenience.
McMahon Services Australia has secured the contract for these works, with completion aimed for mid-2025. This initiative aims to maintain the structural and operational integrity of the flood management system and ensure the Patawalonga Lake System remains a prime site for recreation and natural habitat. This approach aligns with broader environmental management and infrastructure protection strategies, setting a sustainable course for the future.
Residents and visitors looking for further information on the project and associated temporary access changes can consult the Department for Environment and Water website here.
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