Largest U.S. Pool Patrolled by Rowboat

Fleishhacker Pool in San Francisco, the largest swimming pool in the United States, was so vast that lifeguards needed rowboats to patrol it. Built in 1924, it measured 1,000 x 150 feet, contained 6.5 million gallons of water, and could accommodate 10,000 swimmers. In 1999, it was turned into parking for the zoo.

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