The Murray River System
River Murray is Australia’s longest river, stretching more than 2,500 kilometres across south-eastern Australia. Its tributaries—including the Murrumbidgee, Darling, Lachlan, Warrego and Paroo Rivers—form the vast Murray-Darling Basin. The river system supports a wide range of native wildlife, including Murray cod, Macquarie perch, eel-tailed catfish, platypus, turtles and Murray crayfish. Nearby Lake Alexandrina also provides habitat for migratory birds arriving from northern Asia and Alaska, along with species such as the critically endangered orange-bellied parrot.
The Threat
In 2006, the South Australian Government under Premier Mike Rann proposed constructing a weir at Wellington on the lower Murray River. Campaigners warned the structure would sever the Murray-Darling estuary from the broader river system and disrupt the movement of freshwater through the lower lakes and Coorong region. Environmental groups feared the proposal would further damage already stressed river ecosystems and undermine the long-term sustainability of the Murray system.
The Campaign
The Wilderness Society joined community opposition to the proposal and organised public protests against the project. In 2007, campaigners held a colourful rally outside Parliament House in Adelaide calling for the Wellington Weir proposal to be abandoned. The campaign focused on the ecological importance of maintaining natural river flows and protecting the health of the lower Murray system.
The Proposal Abandoned
Following environmental assessment processes and growing public concern, support for the project declined. By 2008, the South Australian Government no longer supported construction of the Wellington Weir. The proposal was ultimately abandoned following the environmental impact assessment process.
Legacy
The Wellington Weir campaign reinforced the importance of protecting natural river connectivity throughout the Murray-Darling Basin. It also became part of broader efforts to defend Australia’s river systems from infrastructure projects that threatened ecological health, wetlands and water flows.