Millicent Swimming Lake Reconstruction

After the 2022/23 summer it was discovered that excessive amounts of water had been used to maintain the levels of Millicent Swimming Lake and on investigation it was determined that the 50-year-old lake floor had been compromised in multiple locations.

The condition of the lake floor could not be fully assessed until the lake was drained and dry after winter.

Aquatic engineering advice has recommended that the best long-term solution would be to remove the existing bitumen seal, reshape the limestone base and concrete the entire floor. This work can only be done during dry weather.

Upgrades to the filtration system and improved disability access are also being designed to enable all to enjoy the renewed facility and this infrastructure upgrade will transform this important asset, extending its life for many decades to come.

Although it is unfortunate that the 2023/24 swim season will be impacted at the Lake, the full extent of this impact is still being assessed. Any opportunity to open the lake for a shortened period will be considered by the Council.

Key points:

• The Millicent Swimming Lake is over 50 years old.
• The Naracoorte Swimming Lake is similar in design and age and went through the exact same process several years ago.
• The deteriorated lake floor is currently made up of a bitumen seal over a limestone base - just like a sealed road.
• Just like a road, this bitumen seal needs to be periodically reapplied.
• Just like filling potholes, we have been undertaking routine maintenance on the lake every year.
• After 50 years, the limestone base has failed and needs to be fully reconstructed.
• A concrete liner is a superior long-term solution to bitumen, as it will prolong its life and reduce future maintenance costs and disruptions.
• We also want to make use of this 1 in 50-year opportunity and replace the underground filtration pipes to improve water quality.
• This work can only be done when the lake is completely dry.