The City of Launceston council's proposed $1 million restoration will see the popular facility's floor filled in up to one metre.

It comes after a landslip in August last year caused significant cracking to its concrete walls.

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Senior project delivery adviser Scott Miller said after an inspection of the site, surveyors determined it was unsafe to keep it open.

However, he said it was amazing the structure had held up for as long as it had after discovering there was no steel inside the walls.

"We discovered that there appears to be very little if any reinforcing in the concrete," Mr Miller said. "Which is very apparent when you can look through the [cracks] and see straight through them."

The council's proposal would see a retaining wall built along the inside of the existing wall, with the ground then being filled to about a metre high.

Mr Miller said this would create a blank slate for the council to work with.

The plan would also incorporate a new ramp which would provide access for heavy vehicles during the construction process and better access for the public at a later date.

Mr Miller said the council had to do something with the site, which is used by thousands of families every year from across the region.

"We can't do nothing with the site because it provides an element of stability to the adjacent building," he said.

"Filling the site in was deemed potentially risky due to adding so much loading to a known landslip area."

Mr Miller said the council was waiting on 2d drawings of how the site would be laid out to determine what facilitates will be available.

He said the focus was on keeping and enhancing what already exists at the facility.

"We know that we are usually booked out six months in advance for this site and we know people are waiting on great anticipation on the reopening of the facility," he said. "It is going to be quite a while yet before its open but putting in a bit of extra effort and time now will hopefully mean we won't have to touch it for another 40 years."

Mr Miller called for people to be patient while the works are being undertaken.

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