Floodwaters are continuing to rise in northern New South Wales after two days of heavy rain and flooding around the state.
The ABC reports about 1800 residents are expected to be stranded in the town of Wee Waa for five days from Sunday morning.
The State Emergency Service says the Namoi River, near Wee Waa, will reach 6.7 metres early Sunday evening, causing major flooding.
The SES says the river will continue to rise to seven metres on Tuesday morning and will cut all road access to the town.
At Moree, about 90km north-east of Wee Waa, 400 residents have been warned they may be asked to evacuate on Sunday night.
The ABC reports about 60 properties near Moree are already isolated, with some most likely cut off for a week.
The Bureau of Meteorology predicts the flood level will reach 9.5 metres in Moree on Sunday night before peaking at 10 metres.
The SES says the predicted flood at Moree is only slightly lower than major floods in January 2001.
The floods have already claimed the life of a child. Police say a boy, aged three, drowned in a storm water drain in Bingara, near Inverell.