Decres Bay is a sheltered natural harbor south-east of Ceduna in South Australia.
[1] In 1914, Decres Bay was under consideration as an alternative site for the development of a commercial port for the bulk handling of wheat at the terminus of the Minnipa Hill railway.
The site was passed over, with insufficient depth of water at the entrance channel cited as a deciding factor.
Despite being more exposed to storms and swell, and requiring ongoing dredging works, the neighboring site at Cape Thevenard was selected in preference.
Members of the Murat Bay Vigilance Committee believed that the port proposal was abandoned as a result of prejudice and politics; namely that the two sites represented competing visions of consecutive Labor (Decres Bay) and Liberal (Thevenard) governments.