This milestone marks the completion of Phase 1 of the upgrade, an essential step to ensure the dam meets modern engineering standards and continues to operate safely while supporting long-term water security for the region.

With the cofferdam now in place, and acting as a temporary dam, works will move into Phase 2 - the demolition of the existing spillway and embankments.

Demolition is expected to begin from 10 April 2026 and will involve 24-hour continuous operations for approximately 15 days, weather permitting.

The accelerated construction approach is designed to protect the site and maintain safe lake levels and downstream flows throughout the demolition period.

Seqwater Executive General Manager Infrastructure Planning and Capital Delivery, Sarah Dixon, said the project was making strong and steady progress on the dam upgrade.

“Completing the temporary cofferdam is a major achievement and positions us well to safely transition into next phase of construction,” said Ms Dixon.

“While weather conditions can change, we have well established plans in place to pause and secure the site should conditions shift unexpectedly throughout the demolition phase. Safety remains our priority every step of the way. The Lake Macdonald Dam Improvement Project is part of Seqwater’s Dam Improvement Program, an important investment to ensure our vital infrastructure continues to remain safe and reliable for future generations,” she said.

During the continuous works period, specialist crews will monitor operations and environmental controls around the clock.

Seqwater and construction partner, John Holland Group, continue to work closely with local residents, including one-on-one engagement with adjacent residents.

Seqwater acknowledges the impacts of this essential phase and is committed to keeping the community informed and supported.

“We appreciate the patience and cooperation of our neighbours. Completing this work safely and quickly is our priority,” said Ms Dixon.

Once demolition is completed, construction of the new dam will begin. The new design includes a split-level concrete spillway, a lower ogee crest at the original lake level, and an upper labyrinth spillway to safely manage higher flows.

The project will support more than 150 jobs throughout construction.

Residents can contact the project team directly with any questions or concerns on 5472 1565 or [email protected].

For project updates, visit Lake Macondald Dam Improvement Project.