Six Flags Hurricane Harbor Chicago is a 20-acre (8.1 ha) water park located in Gurnee, Illinois, United States.

In the late 1990s, interest in building a water park close to Six Flags Great America was proposed; residents of Gurnee opposed these plans.

[6][7] On September 10, 2004, Gurnee officials confirmed plans for a water park opening on Six Flags Great America's existing site.

[12] The new water park was expected to compete with others in Wisconsin Dells and the Chicago metropolitan area,[13][14] and would be the biggest expansion in Six Flags Great America history.

[17][18] The park's centerpiece attraction was the Skull Island interactive playground, which was billed as the largest of its kind, and had 500 gadgets and eight water slides.

The planned roller coaster was Chang, which would have been acquired from the former Six Flags Kentucky Kingdom and was to be located near the park's entrance but the new ride was later canceled.

[30] On August 29, 2019, Six Flags Hurricane Harbor announced a new water coaster named Tsunami Surge, which was built by WhiteWater West.

[31] Ground was broken for Tsunami Surge in January 2020,[32] but the ride did not open due to the park's closure and construction delays during the COVID-19 pandemic.

[58] In August 2021, the water park, along with WhiteWater West and architecture firm Ramaker won the 2021 Leading Edge Award from the World Waterpark Association for their work on Tsunami Surge.