Hurricane Harbor (Six Flags St. Louis)
✓ Last confirmed for the 2026 season
Where: Hurricane Harbor (Six Flags St. Louis), Eureka, Missouri
When: seasonal (summer)
Hours: typically daylight hours
Cost: free
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The water park inside Six Flags St. Louis features the 132-foot Tornado tunnel slide, the Big Kahuna family raft ride, and Adventure Cove, an interactive kids zone with a giant dumping bucket and pirate ship. Entry requires Six Flags admission plus the water park charge.