Location: ///turtleneck.sideshows.provocative
-35.320275, 148.939813

Originally build in 1915 and then extended in 2013, this concrete and rockfill embankment dam provides a reservoir of potable water for the city of Canberra.

It is named after Garrett Cotter, one of the original settlers in the area.

Specs:

• Dam wall length 330 metres (1,080 ft)
• Height = 87 m (285 ft)
• Storage capacity 78 gigalitres.
• Spillway discharge rate, 5,670 cubic metres per second.