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Aerial of Ewen Maddock Dam

Ewen Maddock Dam upgrade

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.

Timeline
Dam Safety Review
2011 - 2014
Option Analysis & Concept Design
2014
Preliminary Design & Approvals
2015 - 2016
Detailed Design & Approvals
2017 - 2019
Project Planning
2019
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Home What We're Doing Ewen Maddock Dam upgrade

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. The upcoming work will be undertaken in two stages the first stage will include strengthening the existing embankment and increasing its floodwater capacity. 

Ewen Maddock Dam upgrade (Stage 2A)

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.  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.

The lake lowering and embankment work is scheduled to take place in 2020 after the conclusion of the wet season. This will be followed by work on the spillway in 2021.

On-water recreation, including a designated swimming and beach area, will now remain open during the 2019 summer and will remain open for the duration of the Summer School Holiday period.

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    Recreation during the upgrade

    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 sunset

    Ewen Maddock Dam to remain open over Spring

    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.

  • 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.

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