After a nearly 2 1/2-year wait, the Plunge pool at Belmont Park will open to the public on July 4. The opening ceremony, which will take place on July 3, will include remarks from Mayor Kevin Faulconer, who also presided at the old historic pool’s demolition on Jan. 30, 2017.
“We look forward to celebrating the highly anticipated re-opening of the Plunge at Belmont Park,” said Steve Thomas, general manager of Belmont Park. “Beginning July 4, the new Plunge at Belmont Park will officially open and provide an iconic place for local and visiting families to enjoy as it has for many generations before.”
The re-imagined Plunge is being managed by Fit Athletic Club. The new facility has the pool on the ground level, with state-of-the-art functional fitness equipment and free weights above on the second floor and roof deck. Fit has said it will be a private, month-to-month membership club with no long-term contracts. 
With a predominantly glass façade, the new Plunge has integrated exterior light with interior coastal textures. The new building features a glass retractable-roof system promoting natural air circulation and preventing some of the deterioration issues that previously plagued the old building from moisture and saltwater.
Belmont Park and its iconic Plunge pool’s history date back to the 1920s and wealthy sugar magnate and early San Diego pioneer John D. Spreckels, who built Belmont Park.
Originally known as The Natatorium, the Plunge’s 60-foot by 175-foot swimming pool was constructed as a centerpiece of the park, and was then the largest salt-water pool in the world holding 400,000 gallons of water. 
In 1940, the salt water of the Plunge began to damage its filtration system and fresh water was brought in making it the largest indoor heated pool in Southern California at 12,000 square feet.