The lake was formed through the construction of the Ginninderra Drive embankment across Ginninderra Creek. The lake has a surface area of 1.05 square kilometres (0.41 sq mi) and an average depth of 3.5 metres (11 ft). Water flow out of the lake is via a multi-celled concrete culvert structure and spillway chute on the Ginninderra Drive embankment.
During 2004 the Ginninderra Drive embankment was raised by one metre. The earthen embankments on the Coulter Drive side of the lake have been raised as well.