BEECHVIEW: Pittsburgh's Canton Avenue is the steepest street in the United States.
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Baldwin Street in Dunedin, New Zealand, may be the steepest residential street in the world; it reportedly averages 1:3.41 (16.33° or 29.3%) for 161 meters but its maximum is claimed to be 35% for an unknown distance. Canton Avenue in Pittsburgh is said to have a 37% grade; the length of that grade is unknown.
Ffordd Pen Llech, a winding street through the historic part of town, has a gradient of 37.45%. Resident Myrddyn Phillips, who took the measurements that led to the world title, said: “To have the steepest street in the world, recognized by Guinness World Records, is brilliant for Harlech, it's brilliant for Wales.”