The indoor Belmont Plaza Pool in Long Beach was temporarily closed Thursday for at least three weeks.
The abrupt move is the result of a draft structural analysis warning that the 1968 facility is seismically unsafe, city officials said.
The temporary closure won't include the outdoor pools, locker rooms and adjacent La Palapa Del-Mar restaurant, which are located at the end of Termino Avenue south of Ocean Boulevard.
Tom Modica, the city's manager of government affairs, said that once the review and inspections are completed, a decision will be made to reopen the pool or keep it closed.
The seismic issue recently came to light as a result of an analysis that's underway for a revitalization plan for the entire pool complex.
The City Council authorized staff to develop options to modernize the existing pool complex, Modica said.
Within 30 days, Modica said, city staff will present the council with long-term revitalization options that may include temporary solutions to restore pool operations.
Staff members are working with the aquatics community to minimize disruptions and help to identify alternative options and facilities, officials said.
Among the other pools offering swimming are Martin Luther King, 1910 Lemon Ave., Silverado, 1545 W. 31 st St., and the outdoor Belmont Plaza pool.
Modica said the city is "acting in an abundance of caution" while engineers review the draft analysis and inspect the facility to confirm the extent of its structural safety.
There is no projected price tag for any pending proposal - whether it's retrofitting the pool, or a new facility, or a temporary site - according to Modica.
Five years ago, recreation planners wanted to replace the Belmont Plaza Pool with a new NCAA-caliber swim competition facility rather than refurbish what they describe as its "severe structural deficiencies."
Officials also wanted a community-serving Long Beach Aquatics Center in the downtown area, although they expected rough waters for those plans.
Both facilities were on a wish-list of beach recreational projects.
Officials said the estimated costs to fix the Belmont Plaza Pool's seismic issues would be about the same as building a new structure.
That price, according to a study outlining the pool's vulnerability to collapse, had pegged retrofitting at about $23 million.
At the time, officials were considering a new pool facility that would feature seating for about 2,000 spectators.
The council had authorized the city manager to evaluate financing alternatives, including a possible bond measure or partnerships between the private and public sectors.
The bond money, recreation planners explained at the time, would "provide seed money for a public/private partnership" for the aquatics center.
Since then, city budget woes have been the main focus of city planners.