Dozens of Kangaroo Valley residents will be forced to isolate in their homes for the second time in less than six months after heavy rain washed away their only access road.
Kangaroo Valley has received about 600 millimetres of rain in the past four days, which has caused significant damage to Upper Kangaroo Valley River Road.
Shoalhaven Council expects it will be several weeks before Upper Kangaroo Valley residents will be able to leave their home by car.
Shoalhaven mayor Amanda Findley said it was the second time this year that residents had been cut off because of wet weather.
"The residents of Upper Kangaroo Valley are again facing some time where they are going to be isolated from getting into town," she said.
"There will be support put in place for people.
The road closure is expected to impact some 60 residents who live along the road.
Ms Findley said Resilience NSW would coordinate the delivery of essential supplies to stranded residents.
She urged any vulnerable people who were cut off to consider relocating.
"The next few weeks for residents are going to be pretty tough," she said.
"My advice for some of those residents who may be vulnerable, if there are friends or family they can stay with in town, or friends who may have an empty holiday house in the valley or somewhere else in the Shoalhaven."
Meanwhile, Transport for NSW is working to clear a landslide that has closed the main road into Kangaroo Valley, Moss Vale Road.
Kiama Council has assessed damage to Jamberoo Mountain Road which has also been significantly undermined by wet weather.
Kiama Council engineering and works director Mike Dowd said the road was expected to be closed for several months.
"More than 60 metres of road has totally failed at one site, with the landslip and flood waters eroding the base and fracturing the tarmac," he said.
"We are still looking at a number of months and a major bill to get it back in operation."
