Canton Avenue is a little street tucked into a corner of Beechview neighborhood of Pittsburgh, USA. It's a block long between Hampshire Street and Coast Avenue. It’s said to be the steepest street in the United States, with a maximum gradient of 37 percent.
Canton Avenue has a grade of 37%, meaning that for every 100 ft (30 m) of horizontal distance traveled, the elevation changes by 37 ft (11 m). Canton Avenue is 630 ft (192 meters) long (the hill is about 65 meters long) and is claimed to include a 37% grade 6.5 meters long.
Pic: By Lildobe at English Wikipedia, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=8919260