The Dams arch wall is one of the thinnest in the world. It holds water in Lake Barrington which is used for the power station. The wall was completed in 1969 and is 84m (275ft) high.
This photo I borrowed and it's used extensively on the internet.
We went up on a hill and managed to get a photo from there, though it doesn't show the dam well.
A scene I took up on the hill.