Elouera beach has suffered substantial erosion, and Cronulla and North Cronulla beaches are also expected to be battered today by the second East Coast Low in a fortnight.
Big waves pounded the coastline over the weekend, causing frontal sand dunes north of Elouera surf club, along with fence posts and wires, to collapse into the heaving surf.
Normally, there would be 10-20 metres of beach between the dunes and waterline. Instead, waves were crashing into the dunes.
Ironically, the dunes have been deliberately built up in recent years in an effort to reduce erosion.
A Cronulla veteran surfer said on Monday the swell in the second East Coast Low wasn't due to peak as big as in the previous intense low pressure system, but the waves were coming more from the east-straight onto the already eroded frontal dunes.
"Wanda and Greenhills were more affected in the last swell," he said.
"This time the middle of the beach at Elouera, Midway and down to Cronulla are facing the full force of the midday high tides and 8-10 ft (up to three metres) waves "
Council workers have erected barricades across beach access tracks.
A council spokesman said, "With adverse weather conditions, large swells and high tides causing significant sand erosion on a number of local beaches, Sutherland Shire Council has closed all beach access tracks from North Cronulla beach to Greenhills beach to guard against potential threats to public safety.
"Council has also closed the Esplanade between Cronulla and North Cronulla as a precautionary measure due to the impact of high tides and large swells on Monday afternoon.
"Council will continue to monitor conditions ahead of any decision to reopen the popular walking path.
"All beach-goers are advised to exercise caution, stay safe and follow directions provided by council staff and onsite signage as adverse conditions look set to continue."
The damage caused by the two East Coast Lows in July follows the loss of thousands of cubic metres of sand from Cronulla beaches on two successive weekends in February this year.