Editing Murray River (section)

===Barrages===
[[File:Map -- location of barrages at the mouth of the River Murray.tif|thumb|Locations of the barrages at the mouth of the Murray]]
[[File:Goolwa Barrage.JPG|thumb|[[Goolwa Barrages|Goolwa Barrage]] viewed from the freshwater side]]

From 1935 to 1940 a series of [[Barrage (dam)|barrages]] was built near the Murray Mouth to stop seawater entering the lower part of the river during low flow periods. They are the Goolwa Barrage, with a length of {{convert|632|m}}; Mundoo Channel Barragel {{convert|800|m}}; Boundary Creek Barragel {{convert|243|m}}; Ewe Island Barrage, {{convert|853|m}}; and Tauwitchere Barrage, {{convert|3.6|km}}.

[[File:Dead and dying River Red Gums on the Murray River near Berri, South Australia.jpg|right|thumb|Dead and dying [[Eucalyptus|River Red Gum]]s on the lower Murray near [[Berri, South Australia]]]]
These dams inverted the patterns of the river's natural flow from the original winter-spring flood and summer-autumn dry to the present low level through winter and higher during summer. These changes ensured the availability of water for irrigation and made the Murray Valley Australia's most productive agricultural region, but have seriously disrupted the life cycles of many ecosystems both inside and outside the river, and the irrigation has led to [[Salinity in Australia|dryland salinity]] that now threatens the agricultural industries.

In 2006, the [[Government of South Australia]] released a plan to investigate the construction of controversial [[Wellington Weir]].{{Update inline|date=February 2021}}