Holidaymakers and other motorists faced significant delays after bushfire flareups and backburning operations forced emergency services to close a section of Princes Highway near Sussex Inlet several times on Boxing Day.
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The traffic disruptions were caused as Rural Fire Service crews worked to contain the massive Currowan fire, which has burnt through more than 206,000 hectares in an area stretching from Batemans Bay in the south to close to Nowra in the north.
During Boxing Day the RFS upgraded the status of the blaze as fire activity picked up. But conditions eased later in the day and the warning was lowered from 'watch and act' to 'advice'.
Emergency services nonetheless warned of the risk that the Currowan fire could jump the Shoalhaven River in the coming days as conditions deteriorate.
"We are not ruling that out and we want people to start preparing for that possibility," Community Safety Officer at RFS Far South Coast Marty Webster said.
An Illawarra RFS spokesperson said there were two containment lines between the fire and the Shoalhaven River on Thursday evening.
However, a contingency plan involving Illawarra crews was in place should the fire breach these lines and cross to the northern side.
In response to the RFS warning, Grady's Riverside Retreat on the banks of the Shoalhaven River announced it would close until further notice, while residents in the area have been warned to monitor conditions and watch out for embers and spot fires.
A community meeting will be held at Bomaderry Bowling Club on Friday at 5pm to discuss the current situation in the Shoalhaven.
RFS spokesman Inspector Ben Shepherd said the fire continued to grow and was not yet under control, though the favourable weather conditions meant crews could work on establishing and strengthening containment lines, including by backburning.
He warned motorists that Princes Highway was likely to be closed intermittently throughout Boxing Day as firefighters worked "to try and hold that fire west of the highway".
While crews used Boxing Day to try and contain the Currowan fire, seven RFS tankers and three aircraft were scrambled to Deua River Valley inland from Moruya after a blaze broke out in the early afternoon.
Inspector Shepherd said the fire was in steep terrain in the Wandera State Forest and Monga National Park that was difficult for ground crews to access.
The blaze was out of control as of late on Boxing Day, though Inspector Shepherd said it was yet to threaten property. By late in the day its status had been downgraded to advice.
The crews deployed to Deua River Valley were among 1900 RFS firefighters and support staff on duty across New South Wales yesterday battling more than 80 fires.
Inspector Shepherd said crews were backburning and working to establish and strengthen firebreaks as part of efforts to contain 30 blazes still listed as out of control.
Lending urgency to the work is an expected deterioration in weather conditions on Friday and through the weekend as a heat wave is forecast to sweep the state, sending temperatures in many areas into the mid to high 30s.
"We will start to see areas of very high fire danger from Saturday, and those conditions will continue to deteriorate early next week," Inspector Shepherd said.
He said a combination of high temperatures, low humidity and strong winds would make it very difficult for firefighters.
All national parks in the area have been closed.
