The State Emergency Service says Hinton residents will remain isolated until at least Friday, after the weekend's heavy rain.
The SES is running a flood boat, twice a day with supplies to the town's 400 residents.
Mandy Haigh from the SES says Hinton has been cut off since Sunday.
"We are running a flood boat into the Hinton area and we'll run that in twice a day," she said.
"The people of Hinton are aware of where they can go and leave their orders for food and things, we're not carrying personnel."
It was expected the Hunter River at Raymond Terrace would peak at its minor flood level of 2.5 metres this morning, while the Paterson and Williams Rivers are now dropping after peaking over the past 24 hours.
Ms Haigh says there is still a lot of water around and is urging caution.
"Most of the roads that have been closed over the last few days are going to remain that way they're not likely to change for at least a few days," she said.
"And we're just saying to people look don't risk it, don't drive through the floodwater, it's just not worth it.
"You don't know what the roads like underneath, you don't know if there's debris or the roads going to fall away underneath, so just use a bit of care."
A moderate flood warning remains in place for Wollombi Brook at Bulga.
SES flood boat operator for Hinton Peter Sherwen has lived in the area for more than 30 years and has been through several floods.
"This is nothing unusual," he said.
"When we get flooded in and become an island, we become a very good social group down here at the hotel.
"And you get to find out the people that you haven't met before - they all come to the pub.
"At the moment it's just a nuisance flood - we're isolated, we're doing supply runs and essential medical transfers.
"Hopefully, two more days or so, we may get out."
© ABC 2013
20:55 EST Landholders are reporting hundreds of millimetres of rainfall across the coastal strip in northern New South Wales.