Some swimmers still braved wild conditions at ocean pools along Sydney's beaches. (Dean Lewins/AAP PHOTOS)

Wild surf conditions with massive tides have battered beaches as walkways collapse and businesses depending on foot traffic sustain heavy damage.

Well-known Sydney beaches Bondi, Bronte, Clovelly and Cronulla were among the areas on the east coast smashed by huge swells on Wednesday and are closed.

Bondi Icebergs pool sustained significant damage with shattered glass and a mangled railing after it was pounded with a 5.5m swell.

A section of the Cronulla esplanade has been cordoned off with parts of the concrete walkway cratering from 4m waves as civil crews inspected the damage wrought overnight.

Brick walls also buckled under the pressure of powerful waves at Bronte in the east.

Bayside Council in Sydney’s south shared photos of extensive damage on Wednesday of broken footpaths, fallen debris and crushed bike lanes at Dolls Point with workers furiously trying to make sure the traffic flow is safe.

Several beaches in the city’s north that are popular with tourists, such as Dee Why, were also impacted and remain closed.

Some adventurous swimmers still braved the conditions on Wednesday morning, dipping into an ocean pool overlooking Cronulla beach.

The Bureau of Meteorology said the immediate threat of coastal hazards has passed and damaging surf conditions have eased, but a hazardous surf warning remains for the entire NSW coast.

A 5.9m wave was recorded on Wednesday at Port Kembla, south of Wollongong.

The wild weather has not subsided weeks after the passing of ex-cyclone Alfred as the bureau warns of fallen power lines, trees and debris.

The NSW State Emergency Service says two weather events are expected to bring more heavy rain, flash flooding, and weeks of isolation for some communities already affected by floodwaters in the far west and northern parts of the state.

Outback communities were warned on Tuesday they may be isolated for more than two months.

“The significant rainfall in Queensland is slowly making its way through the catchment and moving through western NSW,” NSW SES Commissioner Mike Wassing told reporters.

“We are talking of isolation potentially for six to 10 weeks for some of those communities.”

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