Officials at Schlitterbahn water park in Kansas City, Kansas, said that the public will be able to ride the Verruckt slide on Thursday.
The ride was originally scheduled to open on May 23, when the water park's season began. T he next scheduled opening on June 5 was postponed, and a June 29 date was also delayed.
Park officials have said the delays were needed to allow for more testing.
Guinness World Records in April certified the 17-storey, 168ft-tall attraction as the tallest water slide in the world.
Riders on the Verruckt, which means "insane" in German, plummet at 60mph to 70mph on four-person rafts.
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