Port Macquarie Marina employees have worked in shifts to keep watch as floodwaters impacted the Park Street facility.
Marina manager Al Mulvey said the marina was well prepared with a risk assessment, staff on watch and meetings every night leading up to the flood.
The team ensured the boats were anchored and welded chains to the top of the pylons to secure the vessels.
The marina's 85 berths are at 92 per cent capacity.
Only one boat was damaged when it was hit by a pontoon washed down from the canals.
The wharves have been designed for a one in 100 year flood.
The fuel bowsers went under water and the marina arms became isolated due to flooding.
Mr Mulvey, who has been at the marina on and off for 30 years, has never seen higher floodwater there.
"Friday night was horrendous here with the wind," he said.
"It was like a movie."
Marina staff will continue to monitor the situation.
Floodwater went into half of the marina's 16 businesses.
Seasalt Cafe Restaurant was one of those businesses but stepped up to provide food and drinks to emergency service personnel, marina staff and helpers.
Seasalt's Cassie Clark said the business had always taken on the community's passion and got involved where possible.
Floodwater inundated Seasalt's lower level, and stock and equipment were lost.
The clean-up started only to have the floodwater rise again.
Mrs Clark has been heartened by patrons vowing to return when the business reopens.
"It warms the cockles of your soul," she said.
"We all pull together."
Mrs Clark hopes the business can reopen its upper level to sell coffee and basic food in the next day or two.
Meanwhile, businesses in Short Street and Hastings River Drive were among those impacted by floodwater.
GoFundMe pages have been set up for the Rivermark Cafe recovery and Whalebone Wharf disaster relief.
The Whalebone Wharf fundraising page said the restaurant lost everything and will receive no insurance assistance.
"To rub salt on a wound, we had only just began to regain strength since the debilitating impact of COVID-19," the fundraising page said.
"However, we are determined to get through this."
The GoFundMe Rivermark Cafe recovery page said the extent of the damage was unknown as they aren't yet able to gain access.
"The owners of this beautiful business have also had their family home impacted by the floods, so us as the staff, wish to seek them some help with their business," the fundraising page said.
"This family owned business has been in Port Macquarie for 22 years and has recently faced the full force of the COVID-19 pandemic."
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