Ewen Maddock Dam upgrade
Ewen Maddock Dam is located near Landsborough on the Sunshine Coast. The dam was constructed across Addlington Creek, a tributary of the Mooloolah River. Construction of the dam was completed in 1976 and the full supply level (FSL) was raised in 1982.
Following the independent dam safety review in 2010, a number of improvements were identified at Ewen Maddock Dam and approved for delivery. The upcoming work will be undertaken in two stages. The first stage (Stage 2A) will include strengthening the existing embankment and increasing its floodwater capacity. The next stage, Stage 2B, will involve strengthening work on the spillway structure. This stage will be pending Seqwater internal approval upon completion of the Stage 2A project works.
Ewen Maddock Dam upgrade (Stage 2A)
To undertake the upgrade safely the lake’s water level was lowered to less than 60 per cent of its full supply level. The lowered level will stay in place until the embankment work is finished. Once work is complete, the lake will refill naturally to its’ normal capacity dependent on adequate rainfall across the catchment. The new staged approach will reduce the amount of time water levels are lowered and also minimise the duration of closures to the lake’s recreation areas.
Construction on Stage 2A began at the end of March 2020 and will involve raising and strengthening the existing embankment walls with significant improvements to the recreation area. This stage is expected to take 18 months to complete, subject to weather and site conditions.
For the safety of the public, all on-water recreation, access to the designated swimming area and the recreational use of Maddock Park were closed on Monday 30 March 2020 for the duration of the Stage 2A work (up to 18 months). Seqwater has recently modified the access points to the multi- use trails to ensure the trails can remain open during the upgrade. The project has also invested in rejuvenating the wetlands picnic area on Steve Irwin Way, the wetlands will remain open for recreation throughout the upgrade.
- News and updates
- Key documents
- Background information
Horse float car park area to increase
6 Aug 2020
As part of the upgrade project, Seqwater will be increasing the size of the existing horse float carparking area by 25% at Maddock Park.
Hall Contracting and its subcontractors have started work within this area. Read the latest e-update for more info.
Lake level will be lowered to 60% capacity
23 Jun 2020
Lowering Ewen Maddock Dam level is scheduled to start next week. Levels will be lowered to 60% capacity and will stay in place until the embankment work is finished. Sign up to our free dam release notification service to receive alerts during the lowering. For more information, read the latest Ewen Maddock Dam e-update.
Lake lowering to begin mid-June 2020
3 Jun 2020
To allow the work on Ewen Maddock Dam to be delivered safely, the lake level will be lowered to 60% of its full supply capacity. This will begin mid-June 2020, subject to unforeseen delays and weather events.
Read more in the June issue of the Ewen Maddock Dam e-update.
Seqwater to replant trees at Maddock Park
13 May 2020
Seqwater will re-plant a new row of trees along the perimeter of the roadway where the trees are being removed on completion upgrade work.
As part of our work to upgrade Ewen Maddock Dam, Hall Contracting’s subcontractors will be removing some medium sized gum trees within the Maddock Park Area along the perimeter of Connection Road. Read the Ewen Maddock Dam e-update for more information.
Recreation upgrades and closures
29 Apr 2020
As part of the upgrade project, all water-based recreation at Ewen Maddock Dam and the Maddock Park day use area are now closed.
On-water recreation, including the designated swimming and beach area, will be closed as part of the upgrade project from Monday 30 March 2020.
Seqwater has implemented alternate access points to keep the multi-use trails around the lake open during the upgrade. Seqwater has also recently built a new horse float unloading area with Maddock Park to ensure continued access for horse riders during the upgrade.
Seqwater has significantly invested in the Ornamental wetlands picnic area, on Steve Irwin Way to help provide an alternate recreation location during the upgrade. We have recently installed pumps for the wetlands, upgraded picnic tables, resurfaced the access and parking facilities and installed a new toilet block near to the Brew haha Café to significantly enhance this area and make the wetlands a fantastic, picnic destination.
Construction starts at Ewen Maddock Dam
2 Mar 2020
Sunshine Caost contractor, Hall Contracting, has been announced as the successful contractor for the Ewen Maddock Dam Upgrade.
Work will start at the end of March. The 18-month project will bring the dam in line with modern engineering design standards and improve the existing beach and swimming area. Read more in the March issue of the Ewen Maddock Dam e-update.
Sunshine Coast contractor wins bid for major dam upgrade
2 Mar 2020
Construction work will begin next month on the $24 million Ewen Maddock Dam upgrade that will create up to 70 local jobs.
Seqwater has staged construction to reduce the amount of time water levels have to be lowered and to minimise the closure of the lake to recreation activities.
Read the full media statement here.
Recreation to resume sooner at Ewen Maddock
31 Oct 2019
Sunshine Coasters will be able to escape the heat and spend more time in the water with a popular watersports venue set to remain open over summer.
Ewen Maddock Dam will remain open to the public throughout the summer months before the rescheduled upgrade begins early next year.
Community invited to information event at Ewen Maddock Wetlands
31 Oct 2019
Seqwater is hosting an event at the Ewen Maddock Wetlands on 9 November 2019 drop in for a free cup of espresso coffee and to speak with our project team about the upgrade.
Recreation during the upgrade
31 Oct 2019
Currently, the water level within the lake is at about 90 per cent of the Full Supply Level. During the upgrade we will need to lower the water level of the lake to about 60 per cent of the Full Supply Level. Lowering water levels is an industry accepted practice to manage dam safety and bank stability during upgrades. The lake will return to the current Full Supply Level following project completion of the Stage 2A works and adequate rainfall.
For the safety of the public, all on-water recreation, access to the designated swimming area, general access to the multi-use trails from Maddock Park, and the recreational use of Maddock Park will be closed for the duration of the embankment work. Access to the multi-use trails from alternate locations will be maintained as Seqwater has recently modified the access points inclusive of a new horse float unloading area to ensure they can remain open during the upgrade. The project has also recently invested in rejuvenating the wetlands picnic area on Steve Irwin Way. You can stay up-to-date with the progress of the Ewen Maddock Dam Safety Upgrade by subscribing to our e-updates below.
Ewen Maddock Dam to remain open over Spring
23 Aug 2019
One of the Sunshine Coast’s popular recreation areas, Ewen Maddock Dam, will remain open to the public during spring.
The dam was originally earmarked for upgrade work to begin from August this year but has now been rescheduled.
As a result, on-water recreation, including a designated swimming and beach area, will remain open until Seqwater finalises the new project timeline.
Seqwater has recently modified the access points to the multi-use trails around the lake to ensure they can remain open during the upgrade and rejuvenated the adjacent wetlands area.
Seqwater Chief Executive Officer Neil Brennan said unfortunately the tender process did not result in any viable tenders.
“Dam upgrades are highly technical and complex projects. We are now conducting a post tender review to better understand the response of potential contractors before re-issuing a tender for the project. The new tender will reflect the review process,’’ Mr Brennan said.
“The upgrade is part of Seqwater’s Dam Improvement Program designed to ensure SEQ dams can continue to perform safely into the future.
“Dams are large-scale public infrastructures and maintaining their safety is paramount,” Mr Brennan said.
“The upgrade of Ewen Maddock will increase the dam's resilience to extreme events and bring the dam in line with modern engineering design standards. The revised construction schedule will not increase any risks to dam safety.”
To undertake the upgrade safely the lake’s water level will need to be lowered to about 60 per cent of its full supply level.
During the upgrade, all on-water recreation, including the designated swimming and beach area, will be closed for the duration of the upgrade work. The closure will also extend to Maddock Park which will be required as a set down area for the project.
Once the new timeline for the project is finalised Seqwater will host a community event at the newly renovated wetlands area to update the local community.
Seqwater expects to issue a new tender before the end of the year. For more information about the Dam Improvement Program, visit www.seqwater.com.au/damimprovement.
e-update: EMD upgrade July 2020File
e-update: EMD upgrade - 22 June 2020File
e-update: EMD upgrade - June 2020File
FAQs - Ewen Maddock Dam upgradeImage
Ewen Maddock Dam concept planFile
Ewen Maddock Dam recreation guideImage
EMD upgrade timeline as at April 2020File
e-update: EMD upgrade - April 2020File
e-update: EMD upgrade tree removal - April 2020File
e-update: EMD upgrade - March 2020File
e-update: EMD upgrade - November 2019File
e-update: EMD upgrade - August 2019File
e-update: EMD upgrade - March 2019File
Fact sheet: Ewen Maddock Dam Improvement ProjectFile
Fact sheet: Dam Improvement Program
In 2012-13, Seqwater commissioned an independent review of our 26 referable dams, which found improvements are needed at a number of our dams to meet the Queensland dam safety guidelines into the future.
We have prioritised a program of dam upgrades in a staged approach to give us time to scope, design and plan, while maintaining public safety, security of water supply and delivering best value for money.
Ewen Maddock Dam is one of a number of dams in South East Queensland scheduled to be upgraded as part of our regular ongoing maintenance. -
Ewen Maddock Dam was built in two stages in 1976 and 1983 across Addlington Creek, a tributary of the Mooloolah River. Located on the Sunshine Coast, Ewen Maddock Dam is part of the SEQ Water Grid.
In 2012, stage one upgrade at the dam involved the installation of pressure relief wells along the left abutment of the dam wall, and construction of a 1.5 metre weighting berm on the downstream toe area.