Lake Macdonald Dam Improvement Project

Lake Macdonald Dam Improvement Project

Seqwater is undertaking works to Noosa's Lake Macdonald (Six Mile Creek) Dam, including building a new split-level concrete spillway and upper labyrinth, and reconstructing the existing earth embankments. 

The project will not alter the dam's storage capacity, which will remain at 8,000 megalitres, but will seek to enable the dam to withstand extreme weather events.

The lake will be temporarily lowered, with a temporary cofferdam to be installed during construction. The Noosa Water Treatment Plant will continue to operate during construction.

Key Dates

Feb 2024 Contract Award
2024 Expected Construction Commencement


Procuring Agency: Seqwater
Successful Tenderer: John Holland


2023 Seqwater confirmed the preferred design option and obtained the required state and federal approvals to proceed with the project.
Jan 2024 Seqwater announced that early works had commenced on the project.
Feb 2024 Seqwater announced that John Holland had been awarded the construction contract for the upgrade of the dam, with major construction activities to commence later this year.
Jun 2024 The 2024-25 Queensland Budget noted planned expenditure on the project by Seqwater of $71 million in FY2024-25, with the total estimated cost of $428 million.
Estimated Total Cost
Water & Sewerage
Procurement approach
Traditional Procurement |
Queensland |