WaterNSW is working on a planned upgrade to Cataract Dam to ensure its continued safe operation. One of Greater Sydney’s oldest operating major supply dams, Cataract Dam remains safe for day-to-day operations.
Priority works to temporarily stabilise the spillway training wall are now complete. The next phase of the project is currently underway and involves an upgrade to the dam structure to ensure long-term safety with construction expected to start in 2027.
When the upgrade starts, access around the dam for emergency services will be impacted. We will communicate alternative access routes to key stakeholders prior to and during construction.
Benefits
WaterNSW is required to fulfil its responsibilities under the dam safety regulation and act.
The benefits of the dam safety upgrade project include:
- reducing the risk of potential dam wall or spillway training wall failure in the future
- providing a sustainable water supply and flood control for the region with longer structural life span and more stable structures.
Scope of work
The scope of work includes:
- constructing a mass concrete buttress 150 meters in length along the spillway training wall
- installing three vertical post tensioned anchors to match adjacent existing anchors in sizing and spacing on the left abutment dam wall
- erecting temporary fencing to restrict public access from the work areas for safety during construction
- reinstating access tracks as needed.
Public access
Prior to the upgrade work starting, we will advise all stakeholders which areas will be closed to the public for their safety during construction. Please continue to check this webpage before visiting the dam to stay updated on any road closures which may occur during construction.
Please follow all site signage and be aware of construction traffic.
Project timeline
July 2025 - Cataract Temporary Works - Completed
September 2025 - Business Case for Design and Planning Phase - Completed
2025 - 2026 - Design and Planning
2027 - Construction expected to start
Consultation
WaterNSW will continue to work closely with impacted stakeholders and will provide updates throughout the project.
Contact
For more information about the Cataract Dam Safety Upgrade project, please contact our Engagement Team on engagement@waternsw.com.au or call 1300 662 077.
WaterNSW acknowledges the traditional custodians of the lands and waters on which we work and pay our respects to all elders past, present and emerging. Learn more