Photo: Stephen Jaquiery.
The water falls nearly 46m to the turbines of the dam, with an average flow of 510cum every second.
The site, 9km north of Roxburgh, was chosen for a major hydro-electric project in 1947.
The first of the eight 40MW electricity turbines was commissioned in 1956, and the rest had been installed by 1962.
The 150m-long structure required 1.5million tonnes of concrete, much of which was poured by hand.
