The barrage system consists of 128 individual concrete gates that can be opened or closed to manage salinity levels.
The Goolwa lock is the only one in the entire Murray River system that operates between freshwater and saltwater environments.
The construction of the barrages was completed to ensure water security for the agricultural regions upstream during times of low river flow.
The area is an internationally recognized RAMSAR wetland site, supporting migratory shorebirds.
The Goolwa Barrage is the final barrier before the river enters the ocean at the Murray Mouth.
The Goolwa Barrage is a series of five barrages spanning the mouth of the Murray River, separating the freshwater of Lake Alexandrina from the saltwater of the Southern Ocean. Constructed between 1935 and 1940, the structure regulates water levels and prevents seawater intrusion into the river system. It features a navigation lock that allows recreational and commercial vessels to transition between the river and the Coorong. The site is a primary point for observing the meeting of the river and the sea, known as the Murray Mouth. Pedestrian access across the barrage provides views of the barrage gates and the surrounding wetlands. It serves as a critical hydrological infrastructure point for the Murray-Darling Basin. The surrounding area is part of a protected ecosystem supporting diverse birdlife and aquatic species. It remains a focal point for understanding the engineering history of South Australia's river management.
From the pedestrian walkway looking toward the Murray Mouth and the open ocean.
Walk the full length of the barrage to see the contrast between the calm lake water and the turbulent ocean side.
Check the local wind conditions before visiting, as the barrage is exposed and can be very windy.
Bring binoculars to spot the seals that often congregate near the lock or the Murray Mouth.
Do not attempt to swim near the barrage gates due to strong currents and suction hazards when the gates operate.
The navigation lock operates on demand for boats, though it may be restricted during periods of extreme flood or maintenance.
Stay on marked paths; avoid climbing on the barrage gates or restricted infrastructure areas.
