Ord River Dam - WA

The Ord River Dam across the Ord River forms Lake Argyle. The dam was completed in 1971. It is 335 metres long, and 98 metres high. The earth-fill dam wall at Lake Argyle is the most efficient dam in Australia in terms of the ratio of the size of the dam wall to the amount of water stored. Lake Argyle normally has a surface area of about 1,000 square kilometres. The flood capacity at full supply level, to the top of the spillway is 10,763,000 megalitres. Normal storage is 5800 GL. Link:
https://www.watercorporation.com.au/Our-water/Rainfall-and-dams/Dam-levels/Argyle-Dam-Ord-River