The project will raise the current dam embankment and downstream rock fill to add an additional 650 GL of storage to the dam. It will also raise the spillway and intake towers of the dam by 10 metres.
An increase in the dam storage capacity of 53 percent will result in a significant improvement in drought resilience, water security, flood attenuation and water reliability for the Lachlan River.
The $650 million project is jointly funded by the Australian Government ($325 million) and the New South Wales Government ($325 million).
Australian Government funding is provided through the National Water Infrastructure Development Fund.
Construction is expected to be completed late 2025.