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The 1956 River Murray flood is considered to be the greatest natural catastrophe in South Australia's history and is the largest flood ever recorded in the state. The flood peaked 12.3 metres at Morgan.

It occurred as a result of excessive and late rains in the western districts of Queensland, and heavy rains commencing three months earlier than usual in the Murray catchment areas. The Darling and the Murray were both in high flood at the same time.

During floods the waters in the River Murray system spread out below Tocumwal in NSW and engulf the Edward and Wakool rivers, forming one huge lake which helps to control flooding further downsteam by acting as a natural reservoir. In 1956 the usual spread of waters below Tocumwal could not hold the quantity of water and the swollen river raced on its way though South Australia (Mortimer, p 7, 1985) causing widespread damage to agricultural properties and townships.

This flood resulted in the construction of the Menindee Lakes storage areas to store high Darling River flows.

Selections from this footage show Mannum during the 1956 flood.

Grosvenor, G. Arch. The Murray pioneer 1956-57 flood diary / compiled by G. Arch Grosvenor [Renmark, S. Aust.: Murray Pioneer Pty. Ltd.], 1957

Harrison, G. L, 1957 Report on the River Murray flood problem, with particular reference to the 1956 flood, Maribyrnong: Dept. of Defence Production, Central Drawing Office

Mortimer, Peg. Flood, Riverlanders face the flood of fifty-six, Berri, S.A.: P. Mortimer, c1985

River Murray floods, 1956: a pictorial record of the South Australian section of the River Murray during the floods of 1956 [Adelaide, S. Aust.?: s.n., 1957?]

History of Mannum, Adelaide Hills online