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Goolwa Barrage
 
lock from seaward
Lock From Seaward
seals
Seals
barrage
Barrage - Seaward Side
great egret
Great Egret
board walk
Boardwalk to Ocean Beach
fish ladder
Fish Ladder
along barrage
Along Barrage
dunes
Dunes
Barrage Pillars
Barrage Pillars
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Five barrages have been installed to separate fresh water in the Murray River from salt water in the Coorong and to maintain the level of fresh water in the Murray River and in Lakes Alexandrina and Albert. Water level upstream of the barrages is normally 0.75 metres above mean sea level; the barrages cause increased water level of about 0.5 metres as far upstream as Lock One at Blanchetown 274 kilometres upstream.
These barrages have to meet unusual design requirements because they operate in tidal waters with higher water levels on different sides at different times. Sometimes high tide increases the salt water level above the upstream fresh level while at other time the fresh river water level exceeds the level on the sea-water side.
The Goolwa Barrage, 632 metres long, is built on timber piles and sheet piling on fine sand and silt. Stoplogs dropped between the piles affect water flow and control upstream water level; during times of low river flow all stoplogs are installed to stop the river flow and maintain high water level. During floods stoplogs are removed.
Goolwa Barrage (sometimes known as Goolwa Channel Barrage), 8 kilometres upstream of the Murray Mouth, contains a lock permitting boats to pass from Lake Alexandrina into the Coorong. The lock chamber is 30.5 metres by 6.1 metres.
Contruction began in June 1935, bottom stop logs were installed by 24 December 1939 and the system was closed by 5 February 1940.