The Currowan fire on the South Coast has broken containment lines and forced the closure of the Kings Highway again.
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The fire, which has been burning north of Batemans Bay for nearly three weeks, jumped Currowan Creek before 4pm on Sunday.
An active fire front of about one kilometre was approaching the Kings Highway near Misty Mountain Road and Government Bend at about 5pm on Sunday. As of 8pm, the fire was as little as 30 metres away from the highway in sections.
Waterbombing aircraft was sent in to contain the spread.
NSW Rural Fire Service officer Marty Webster said the fire was moving quickly uphill and firefighters were actively attacking the blaze.
It was in an awkward spot and firefighters were disappointed the fire had crossed the creek, Mr Webster said.
"We were hoping to hold it along the creek but that's no longer possible and we've had to fall back to the Kings Highway," he said.
However there was currently no threat to homes or assets.
It means the Kings Highway is closed again, between Narranghi Road near Braidwood and Reid Street near Nelligen.
The road only reopened late on Friday, after being shut for more than a week due to firefighting and backburning operations.
With Araluen Road also closed, any Canberrans trying to get from the South Coast back home could be in for a difficult time.
Motorists were being told to travel were being told to use the Princes Highway, Albatross Road, Braidwood Road and Nerriga Road.
People should use the Livetraffic website to monitor the road closures.
Mr Webster said he could not advise how long the Kings Highway would be closed, but the road would remain shut so long as there was active fire in the area.
There would also need to be more backburning done along the Kings Highway now, although that would not happen until conditions improved.
Mr Webster said there was also active fire also at the other end of the Currowan fire, near Pigeon House Mountain.
Residents in the Milton area would likely see increased smoke and fire would likely be visible once it gets dark.
However, there was no threat to properties.
The fire has burnt out nearly 90,000 hectares since it began on November 26.
There were more than 250 volunteer firefighters out on the fireground on Sunday.
Dry and gusty conditions fuelled an increase in fire activity on both the northern and southern edge of the fireground.
"The air's been quite dry again, with low humidity and gusty winds [which has been driving the fire]," Mr Webster said.
Conditions are expected to ease slightly on Monday and Tuesday before deteriorating again on Wednesday.
However Mr Webster said fire crews were ready.
"We always prepare for the worst and hope for the best," Mr Webster said.