Enlarged Cotter Dam

3D Model

Completed in 2013, the enlarged Cotter Dam comprises a new 87-metre high concrete dam wall built downstream from the old 26-metre high dam wall, along with two auxiliary embankment dam walls along low-lying adjoining valleys. Constructed on rock foundations by the Bulk Water Alliance, an Abigroup–John Holland-GHD joint venture, the main dam wall is 330 metres long. The enlarged dam wall increased the storage capacity of the Cotter Reservoir from the previous 3.9 gigalitres to 78 gigalitres while the catchment area remains 482 hectares.