Wyangala Dam Wall Raising

Wyangala Dam Wall Raising

Subscribe for updatesA major augmentation of Wyangala Dam will deliver improved water security and flood mitigation benefits for the Lachlan Valley.


In October 2019 the Prime Minister and NSW Premier announced the planning and delivery of three new or augmented dams in NSW. Included in this package was the raising of Wyangala Dam wall to improve water security and drought resilience in the Lachlan Valley.

Wyangala Dam Wall Raising is estimated to cost $650 Million and increase storage by 53% by creating capacity for an additional 650 gigalitres. The project will involve raising the dam wall by around 10 metres, with the exact height and new full supply level to be confirmed throughout the next six to nine months as further detailed investigations, technical assessments and site inspections are undertaken.

The Wyangala Dam Wall Raising Project was identified in WaterNSW’s 20-year Water Infrastructure Study and was selected due to its initial feasibility study and ability to provide the Lachlan Valley greater water security.

The project has been classified as Critical State Significant Infrastructure and it will be delivered on an accelerated timeline while still meeting all the necessary planning requirements.

Project timeline

  • Field investigations commence – March 2020
  • Inundation mapping reports – September 2020
  • “Shovels in the ground” ancillary works commence – October 2020
  • Construction works commence - October 2021

WaterNSW is committed to partnering with the community, stakeholders and customers so that together we can achieve the best outcomes from this critical infrastructure project. Community engagement will occur at every stage of the project.

Wyangala Dams Schedule

Project updates

Stay informed and view the latest project updates and FAQS.

Planning and delivery

For detailed project planning information please visit the NSW Government Planning portal.

View the Environmental Assessment Requirements (PDF)

Contact us

Please contact us with your enquiries or for more information and to receive project updates please subscribe below.

Water NSW will be focused on the following guiding principles in the planning development, and construction of this project :

  • Maximising local benefits and opportunities
  • Prioritising and leveraging local contractors and services
  • Engaging early on environmental and cultural impacts
  • Working directly and personally with upstream landholders who may be impacted by inundation from the rise in water levels
  • Maximising customer and community benefits Modelling and explaining future flood frequency scenarios
  • Having a local point of contact for community groups, stakeholders and landholders

WaterNSW will work closely with the community to address the issues and opportunities that arise through the life of the project in further detail.


Facebook users can also join the WaterNSW Wyangala Dam Wall Raising project community group.

Local Business Register

WaterNSW is collecting a register of local businesses interested in providing support to the Wyangala Dam Wall Raising Project. Please register your interest and provide a short summary of the service your business provides, as well as your business location and preferred method of contact


Wednesday 05 August
2,198,120 ML
2,581,850 ML
9,341 ML
1,335 ML
40,803 ML
Wednesday 05 August