It was designed by the Scottish engineer Sir Murdoch MacDonald,[1] begun in 1914 and completed in 1925 by the British contractor S Pearson & Sons.

Work on the dam started in 1914, but was almost immediately interrupted by the outbreak of World War I.

[2] In 1922, with further funds obtained, six British firms were invited to tender to complete the dam and build the connecting canal system.

[2] Oswald Longstaff Prowde was resident engineer and John Watson Gibson was site agent.

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