Thousands of homes could be flooded in Gladstone from water gushing out of a nearby dam and a king tide.
The Awoonga Dam has broken its bank and is spilling water into the Boyne River.
The suburbs of Tannum Sands and Boyne Island, at the mouth of the river, are being evacuated before Saturday morning’s 4.2 metre high tide.
Mayor Gail Sellers has called the situation unprecedented.‘‘The tide will back up there,’’ she told ABC radio.
‘‘At the moment, police and emergency services are down in that area door-knocking. They are asking people to evacuate."