Properties around Wee Waa are isolated after the Namoi River broken its banks, but the water is expected to recede after a flood peak of 6.5 metres on Thursday morning.
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Namoi State Emergency Services (SES) crews have done a number of helicopter resupplies, dropping off everything from food to medicine.
The small town of Pilliga has been cut off from Wee Waa for over a week, but residents still have four-wheel drive access to Burren Junction.
Both Narrabri Shire Council and SES are closely motoring the Kamilaroi Highway, which is still open despite much of it being covered in water.
Some parts of the highway have been reduced to one-way traffic, as council leads vehicles across sections of the highway where only the middle of the road remains above water.
Namoi SES controller Andrew Galvin said it was “very fortunate” this week's rain was not as heavy as predicted.
“Hopefully after this we will have a respite for a week or so,” Mr Galvin said.