Opened in 1987 as an ornamental lake, the impoundment created by the dam is called Lake Mitchell and at full supply level has an active capacity of 129,000 megalitres (28×10^9 imp gal; 34×10^9 US gal).

Commenced in 1986 and opened a year later, the Southedge Dam wall consists of an earth-fill embankment 530 metres (1,740 ft) in length and 16.5 metres (54 ft) high.

The reservoir has a catchment area of 321 square kilometres (124 sq mi).

[4][5] When the dam spills over it flows into the Mitchell River.

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