A Rapid Damage Assessment (RDA) of the region's roads, conducted by Shoalhaven council engineers and road crews, found it would cost $35 million to repair the damage.

Shoalhaven council teams logged 2,600 sites of damage across more than 250 kilometres of road, including 48 major landslips and 114 minor landslips.

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A "severe" landslip at Upper Kangaroo Road has also left up to 100 residents isolated since last Friday, as it is the only access point for the community, according to local Gary Moore.

Wattamolla Road, Bunkers Hill Road and Formans Road have also suffered significant landslips.

Shoalhaven council has marked these roads as areas of concern and due to the extensive damage, it is unknown when traffic will return to pre-flood conditions.

"These roads are of major concern and are expected to experience traffic restrictions for many months while geotechnical assessments are made, and repairs are undertaken," a council spokesperson said.

"Alternate access arrangements will be made whilst these repairs are completed.

"Works are being prioritised to ensure communities can be accessed and resources delivered to those most in need."

On the first day of the federal election campaign, Prime Minister Scott Morrison and Gilmore Liberal candidate pledged a $40 million boost for the Shoalhaven road network should their party be elected in May. Shortly after, Labor's incumbent Gilmore MP Fiona Phillips matched the announcement.

Shoalhaven Mayor Amanda Findley welcomed the commitment made by both parties.

"The repair of our road network is going to be an enormous and lengthy task and it will require cooperation from all tiers of government to get the job done," Cr Findley said.

"We welcome the support and funding recently pledged by both Liberal and Labor parties during the election campaign."

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Cr Findley assured the community council staff are working to remediate and repair the road network as soon as possible.

"Council teams have been working around the clock to keep up with emergency road works, however whilst the rain is still with us road conditions will continue to deteriorate," Cr Findley said.

"We are asking motorists to be patient while the extent of damage is being assessed and repaired and to please, drive cautiously and to the conditions.

"Our team is doing all they can to ensure the safety of our community, minimise disruptions and establish access as widely as possible."

Four bridges were also damaged or destroyed with heavy rain and flooding, eight causeways have been washed away and 65 culverts/pipes crossings damaged, bringing the damage bill to date to more than $35millon.

With more rain predicted to hit the region, council is anticipating further damage and said repair works may be delayed.

Council's leadership team have established a Natural Disaster Roads Project Office to assess the extent of the situation and prepare for the repair job ahead.

Council said requests have been submitted to the Local Government Emergency Recovery Support Group and funding will be sought from state and federal disaster relief grants.

The Natural Disaster Roads Project Office will keep the community updated with road works projects and timelines, allowing residents to plan accordingly.

For emergency assistance due to flash flooding and storm damage, call NSW SES on 132 500. For life-threatening emergencies including rescue, call 000.

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