O'Fallon Park Spray Pool (Cornerstone Playground)
✓ Last confirmed for the 2025 season
Where: 1955 Adelaide Ave, St. Louis, Missouri
When: seasonal (summer)
Hours: 6 a.m.-10 p.m.
Cost: free
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The spray pool sits beside the Cornerstone Playground in one of north St. Louis's big historic parks. It appears on the city's official list of spray and wading pools, so water features are maintained by the parks department.