Menindee Lakes

The Menindee Lakes lie on a floodplain of the Darling River, about 200 kilometres downstream of Bourke and 110 kilometres south-east of Broken Hill. The system comprises a series of shallow, interconnected basins, the largest being Lakes Menindee, Cawndilla, Pamamaroo, and Wetherell. Water enters via the Darling and its anabranches, and outflow is controlled by weirs and regulators, notably the Menindee Main Weir. Because the lakes are ephemeral, their water levels fluctuate dramatically; they can be nearly dry during drought and fill rapidly during floods. The system is managed as a water storage scheme, with releases timed to meet downstream demands in South Australia and to support environmental watering of the lower Murray. Evaporation losses are high, and the lakes are a key focus of water-sharing debates in the Murray–Darling Basin.

The Menindee Lakes are a Ramsar-listed wetland of international importance, recognised for their role as a drought refuge for waterbirds. When flooded, they support large breeding colonies of pelicans, ibis, and cormorants, and provide habitat for the endangered Australasian bittern. The lakes also sustain native fish such as Murray cod and golden perch, which migrate between the river and the floodplain. The surrounding vegetation includes river red gum and black box woodlands, which depend on periodic inundation. However, altered flow regimes and water extraction have reduced the frequency and duration of flooding, leading to concerns about ecological decline. Conservation efforts focus on restoring natural flow variability and protecting critical breeding habitats.

The Barkindji people, whose name means 'people of the river', have lived along the Darling and its lakes for tens of thousands of years. The lakes are central to their Dreaming stories, and the region contains numerous archaeological sites, including scarred trees and burial grounds. European exploration began in the 1830s, with Thomas Mitchell and later Charles Sturt passing through the area. The town of Menindee, established in the 1860s, became a river port and service centre. In the 20th century, the lakes were developed as a water supply scheme, with the Menindee Lakes Storage Works completed in the 1960s. This development brought economic benefits but also disrupted traditional land management and led to long-running disputes over water rights.

Beyond the main lakes, the system includes many smaller, unnamed basins that fill only in major floods, creating temporary habitats for rare frogs and invertebrates. The lakes are also a site of the 'Menindee fish kill' events of 2018–19, when millions of fish died due to low oxygen levels, drawing national attention to water management. A lesser-known fact is that the lakes were once proposed as a site for a major inland port in the 19th century, but the idea was abandoned. The region also holds a record for extreme temperatures, with Menindee recording 49.7°C in January 2019, one of the highest temperatures ever measured in Australia. Additionally, the lakes are a stopover for migratory shorebirds on the East Asian–Australasian Flyway, making them a site of international conservation concern.

Ephemeral

A water body that exists only seasonally or after rainfall, drying out for part of the year.

Ramsar-listed

Designated as a wetland of international importance under the Ramsar Convention.

Anabranch

A branch of a river that rejoins the main channel downstream, often forming an island or floodplain.

Regulator

A structure used to control water flow, such as a weir or gate.