Waipio Valley Road on the island of Hawai'i is said to be the steepest rural road in the United States, with some grades approaching 45%.
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In 2020, Guinness World Records reinstated Baldwin Street as the steepest road in the world. Located in Dunedin, New Zealand, Baldwin Street had held the record for more than a decade until June 2019, when Ffordd Pen Llech in Harlech, Wales, claimed the title.
1. Canton Avenue, Pittsburgh, Pa.; 37 percent gradient. This is the steepest officially recorded public street in the U.S., and probably the world. Although its 37 percent grade only extends about 21 feet, it still stops walkers and bikers dead in their tracks.