The Narrabeen Lagoon entrance is undergoing clearance works to help reduce flood risk and maintain one of Sydney’s most important waterways. The project, which started in early September 2025, involves relocating large volumes of sand around the Ocean Street Bridge area.
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Between 22,000 and 30,000 cubic metres of sand will be removed from the lagoon mouth. Most of the sand is being transported by truck to Collaroy-Narrabeen Beach to help replenish the shoreline, while a smaller portion is being placed at Lagoon Street Reserve. The effort is part of the ongoing Narrabeen Lagoon Entrance Management Strategy, which seeks to balance environmental management with community use.
For locals and visitors, the works bring temporary changes to the area. Birdwood Park carpark, on the southern side of the Ocean Street Bridge, is closed while machinery operates. Trucks are accessing the beach via Mactier Street and the Collaroy Beach Reserve. Noise, dust, and pedestrian detours are being carefully managed, with contractors working closely with Northern Beaches Council to minimise disruption.
Walking tracks, fishing spots, picnic areas, and open spaces make the lagoon a popular destination for families, fitness enthusiasts, and nature lovers. The clearance works are aimed at protecting these community assets by improving water flow through the lagoon entrance and reducing the likelihood of flooding in nearby streets.
Sand naturally accumulates at the entrance over time, which can affect water movement and local safety. By clearing the entrance, experts hope to maintain a stable waterway that supports wildlife, recreational activities, and surrounding residential areas.
The project is supported by the Commonwealth Government through the NSW Flood Recovery and Resilience Grant Program. Northern Beaches Council has stated that the works are guided by expert advice and careful planning, ensuring both environmental protection and public safety.
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Once the sand has been redistributed to the beach and Lagoon Street Reserve, the project will have improved the flow at the lagoon entrance and reduced the risk of flooding in the area. Works are expected to finish before the December school holidays, weather permitting.
Residents are encouraged to plan for temporary detours and to exercise caution around the work zones. Council continues to provide updates on lagoon management and progress of the clearance works via its website.
Published 14-October-2025
