Ord Dam - Lake Argyle StatisticsDid 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.

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 (2008)
Approximately 6,000
Average annual rainfall (mostly falls November to March)
787mm / 31 inches
Average annual evaporation
Average annual flow of Ord River at Dam site
4,400,000 mega litres
Total length of the Ord River
Catchment area (Ord and other rivers south of Lake Argyle)
46,200 square kilometres

Kununurra Diversion Dam (Completed 1963)

Length of dam including levees
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
Height from river bed
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
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)