Mildura Weir and Lock 11, located on the Murray River in north-western Victoria, are notable structures with a rich history and unique features in Australia's water management infrastructure. Construction of Mildura Weir and Lock 11 began in August 1923 and was completed in 1927. This project aimed to enhance navigability along the Murray River and provide stable pools for irrigation development.
Mildura Weir is a trestle weir, the only one of its kind in Australia following the upgrade of the Torrumbarry Weir. It consists of 24 steel trestles, each weighing approximately 11 tonnes. These trestles can be winched up from the river to facilitate maintenance or allow the safe passage of floodwaters. Lock 11, adjacent to the weir, is a concrete chamber measuring 61.5 m long, 17.1 m wide, and 7.6 m deep. It includes four steel lock gates, each 9.4 m long and 6.9 m high, weighing 18 tonnes. The lock chamber can accommodate around 4.5 million litres of water (4.5ML). The lock operates by filling and draining water through butterfly valves and hydraulic cylinders, maintaining a stable water level for navigation purposes.
Historically, the first paddle steamer navigated through Lock 11 on 2 August 1927, marking a significant milestone in the river's transportation history. Mildura Weir plays a crucial role in diverting water to Lower Murray Water's Mildura and Red Cliffs districts, as well as private diversion customers. This infrastructure contributes to stable water supplies for irrigation and improved water quality in the Mildura region by preventing excessive groundwater percolation.
Mildura Weir and Lock 11 are unique in that they are separated by an island, a distinctive feature along the Murray River. This island spans 15 hectares of bushland, providing a habitat for native wildlife and attracting tourists interested in both the natural environment and the engineering marvels of the area. Additionally, Lock 11 stands out as the only lock on the Murray River where the public is permitted to walk across, offering visitors a firsthand experience of this historically and environmentally significant site.
For further information www.g-mwater.com.au