The newly installed $4million sand transfer system at Jimmys Beach was among the victims of monster waves that gnawed at the region's coastline on Wednesday.
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In addition to the ongoing erosion woes at Stockton beach, Worimi Conservation Lands and Samurai Beach were ruled off-limits to 4WD vehicles on Wednesday afternoon.
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National Parks and Wildlife Service Hunter Coast Area Manager Andrew Bond said large swells, gusty winds and soft sand had made driving on the popular beaches impossible and unsafe until conditions improved.
"Large swell has swamped the beaches and extreme wave action has eroded the sand, creating steep drop offs and large areas of very soft sand," Mr Bond said.
"So there is insufficient beach remaining to allow for the safe traverse by vehicles."
Jimmys Beach locals awoke on Wednesday to find PVC piping from the sand transfer system strewn on the foreshore between Guya and Kururma Streets.
The sand transfer system was installed in May as part of a strategy to reduce the effects of erosion by pumping sand from the nearby mouth of the Myall River across to Jimmys Beach.
Mid Coast Council's coastal management coordinator Andrew Staniland said a small buffer had been established prior to the wild weather.
"No pipework was damaged as a result of this exposure," he said.
"Our contractors have temporarily moved 100 metres of displaced pipes from the site while seas are high. Once conditions improve the pipes will be re-laid, so we can continue with the commissioning of the system."
City of Newcastle closed off access to the Mitchell Street seawall and northern access to Stockton beach at Stone Street on Tuesday afternoon.
It continued to monitor water levels along Shortland Esplanade and promenades along the city's beaches and ocean baths.
The wild weather and icy winds are expected to ease overnight, but the weather bureau has warned that large surf will linger on the state's coast in coming days.
"We will see the rapid easing of the winds overnight, but the damaging surf conditions with wave heights exceeding five metres will be remaining until tomorrow morning," Bureau of Meteorology forecaster Jiwon Park said.