Wyangala Dam Wall Raising

Wyangala Dam Wall Raising

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

What's happening in April?

  • Our quarterly project newsletter will be published for the community, stakeholders and businesses
  • Wyangala Waters and Grabine Lakeside Holiday Park onsite pop-up information sessions on Thursday 8, Friday 9 and Saturday 10 April
  • We are holding our next round of Community Information Sessions from 19 April - 23 April across the local area. For event details and to RSVP, click here
  • Local business webinars will be held on 15 and 16 April, RSVP here


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, drought resilience and flood attenuation in the Lachlan Valley.

Wyangala Dam Wall Raising project is expected to create capacity for an additional 650 gigalitres – 53% more storage. The project will involve raising the dam wall to increase the Full Supply Level by 10 metres.

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 significant benefits to the Lachlan Valley.

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 approvals.

Project next steps

  • Field investigations ongoing
  • Environmental surveys ongoing
  • Hydrology and flood modelling ongoing
  • Wyangala Water Treatment Plant planning approval underway
  • Wyangala Water Treatment Plant procurement underway
  • Inundation mapping underway
  • Environmental Impact Statement public display – 2021
  • Final business case submitted - 2021
  • Main construction 2022

Main construction work is expected to take about four years.

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

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

To speak with the Project Team, phone 1800 735 822 or email wyangaladamproject@waternsw.com.au. To receive project updates, please subscribe below

WaterNSW is committed to these  guiding principles in the planning, development, and construction of this project:

  • Maximising benefits and opportunities for local people, businesses and communities
  • Using local contractors and services
  • Engaging early, particularly on environmental and cultural impacts
  • Working directly and personally with upstream landholders who may be impacted by inundation from the rise in water level
  • Maximising customer 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 encouraging local businesses to register as a supplier for the  Wyangala Dam Wall Raising project. The local business register will be provided to the major construction contractors so they can demonstrate how they will maximise local business and employment opportunities as part of the tender process.

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


Monday 19 April
2,472,636 ML
2,581,850 ML
9,734 ML
1,391 ML
-7,221 ML
Monday 19 April