| H1 Unlimited | |
|---|---|
| Title sponsor | United Auto Workers General Motors |
| Dates | August 22–23 |
| Location | Detroit River, Detroit, Michigan |
| Track length | 2.5 mi (4 km) |
| First race | 1916 |
| Former names | Challenge Cup, Gold Cup |
| Most recent winner | U-6 Oberto Miss Madison Jimmy Shane |
| Website | http://www.detroitboatraces.com/ |
The Detroit Hydrofest (branded as the Metro Detroit Chevy Dealers Detroit Hydrofest for sponsorship reasons) is a H1 Unlimited hydroplane boat race held in August on the Detroit River in Detroit, Michigan.