Ewen Maddock

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Ewen Maddock Dam was constructed 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 South East Queensland’s drinking water supply.

It is an un-gated dam, meaning that when it reaches 100 percent capacity, water flows over the spillway and safely out of the dam.

If you would like to be notified when Ewen Maddock Dam begins to spill, sign up to our free dam release notification service or download our public safety mobile app.

Current capacity

Full supply volume
16,587 ML
Current volume
16,406 ML
at 3:03am 19/06/2024
  • Key information

    Ewen Maddock

    Addlington Creek

    Addlington Creek

    Catchment area

    Length of dam wall

    Year completed

    Type of construction
    Zoned earthfill embankment

  • When full, Ewen Maddock can hold up to 16,587 million litres of water that can be treated for drinking.

    Read more about the SEQ Water Grid.

  • Flood mitigation

    All dams help mitigate flooding to some extent. The peak outflow from a gated or un-gated dam during a flood event is less than the peak outflow that would have occurred had the dam not been built, because some water is held in the dam while it is spilling. This means that water flow slows down as floods pass through the dam.

    It’s important neighbours and people downstream of dams know what to do in the unlikely event of an emergency. Each of our dams have an emergency action plan (EAP) in place to enable us to respond quickly to potential incidents in partnership with the Bureau of Meteorology, relevant emergency services and local councils. For Ewen Maddock Dam, this is Sunshine Coast Council.