Responsible Agency: Seqwater
BQ Role: Assist with business case
Proposal Stage of Development: Business case underway
Planned Stage End Date: Q4 2016
Estimated Cost of Delivery: $80 million*
Date of Publication: June 2016 (for the period 3 December 2015 – 3 June 2016)


Lake Macdonald Dam on Six Mile Creek on the Sunshine Coast requires an upgrade to meet modern standards and the performance requirements of the Queensland dam safety regulations into the future. The upgrade will allow the dam to better manage severe weather and earthquake events.


The objective of the proposal is to ensure the dam can meet performance standards into the future. This includes improving the spillway discharge capacity and earthquake stability while maintaining water supply security. Studies have considered a range of options including decommissioning of the dam, retrofit of strengthening works and new build options.


Complete Business Case.

* Nominal cost in Australian dollars, 2016 estimate provided by Responsible Agency