Bold Park Aquatic Centre users say it will be a tragedy if the facility is closed.
There has been a groundswell of support for the centre, which has been running for almost 40 years, as the Town of Cambridge considers the future of the historic pool, which needs an estimated $6 million refurbishment.
The Save Bold Park Pool Group will present a 3000-signature petition to councillors this week.
Mayor Simon Withers said the council was only going through due process by considering the pool's future. He conceded the council had been told works would need to take place next winter.
"At no stage has the council indicated that the pool will be closed," Mr Withers said.
The council is likely to approve $150,000 to fund a report for detailed designs for the overhaul.
"The one thing I want to emphasise is we do have the money to do it, there is money in the long-term financial plan," Mr Withers said.
Gillian Morris, one of about 35 people who attend water aerobics classes at the pool every morning, described the pool as a community gem.
"I think the whole community would be devastated if it went," Mrs Morris said.
Floreat mothers Estelle Buzzard and Melanie Pregnell said the pool was an ideal meeting place and other pools were not as family friendly.
Dan Scott said he had been using the pool for a decade."We live in City Beach and it is one of our main opportunities to get together in the community," he said. "We want to make it known we really value the pool."
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