A temporary dam has been completed as part of the Lake Macdonald Dam Improvement Project, paving the way for the next critical phase of works to proceed.
The construction of the cofferdam marks the end of Phase 1 of the upgrade, with works to now move into Phase 2: the demolition of the existing spillway and embankments.
Demolition was due to start late last week and will involve 24-hour continuous operations for about 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,” she said.
“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.”
During the continuous works period, specialist crews will monitor operations and environmental controls around the clock.
Seqwater and construction partner John Holland Group are continuing to work closely with local residents, including one-on-one engagement with adjacent residents.
“We appreciate the patience and cooperation of our neighbours. Completing this work safely and quickly is our priority,” Ms Dixon said.
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 and aims to ensure the dam meets modern engineering standards, continues to operate safely and provides long-term water security for the region for generations to come.
“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,” Ms Dixon said.
