Did you know…

At normal full supply level the area of the lake formed by the Ord Dam is 980 square kilometres and impounds 10.7 million mega litres (8.6 million acre feet) of water, over 18 times the volume of water contained in Sydney Harbour! If the lake ever does flood to its maximum capacity then the volume will more than triple – Sydney Harbour could be filled more than 70 times.

Ord Dam - Lake Argyle Statistics

Kununurra forms the hub around which the Ord River Irrigation Project revolves. Centred in the Eastern Kimberley, the area not only provides incomparable tourist attractions, but a massive intensive agricultural development, made possible by the construction of the two dams.

Ord River Irrigation Project Statistics

  • Present area under irrigation (2008): 13,000 hectares
  • Water used (2008): 171,500 megalitres
  • Ultimate irrigation area: 45,000 hectares
  • Potential water usage: 587,000 mega litres / year
  • Population of the Ord Valley: Approximately 6,000
  • Average annual rainfall (mostly falls November to March): 787mm / 31 inches
  • Average annual evaporation: 2,700mm
  • Average annual flow of Ord River at Dam site: 4,400,000 mega litres
  • Total length of the Ord River: 650km
  • Catchment area (Ord and other rivers south of Lake Argyle): 46,200 square kilometres

Kununurra Diversion Dam (Completed 1963)

  • Length of dam including levees: 5km
  • Storage volume: 100,000,000 cubic metres
  • Distance from main Ord Dam (Lake Argyle): 55km downstream

Ord River Dam (Completed 1971) / Lake Argyle (Filled 1974)


  • Length at crest: 335m
  • Height from river bed: 98.5m
  • Volume of clay core: 243,000 cubic metres
  • Total material: 1,903,000 cubic metres
  • Full storage capacity – volume: 10,700,000,000 cubic metres
  • Surface area at storage: 980 square kilometres
  • Maximum flood level – volume: 34,655,000,000 cubic metres
  • Surface area at flood: 2,072 square kilometres
  • Maximum depth in flood: 63m
  • Highest level to date (7 April, 2011): 101.36.m AHD*
  • Lowest level to date (4 January, 1991): 78.58m AHD*

(*AHD – Australian Height Datum)