Canton Avenue

Canton Avenue is a street in Pittsburgh, Pennsylvania's Beechview neighborhood which is the steepest officially recorded public street in the United States.Canton Avenue is 630 ft long and is claimed to include a 37% grade 21 feet long. The Guinness Book of World Records says Baldwin Street, in Dunedin, New Zealand, is the world's steepest street with a gradient of 34.8%. This record is disputed; Pittsburgh news and international media have claimed Canton Avenue is the steepest street in the world. The United States record is also disputed, as Bradford Street in San Francisco includes a 39% grade nine meters long.The National Map says the steep 213 feet of Canton Avenue averages less than 30%. The map's elevations can be off by a foot or two; probably Pennsylvania's LIDAR surveys done in the last few years can do better.

Source: Wikipedia