The Steepest Residential Street in the World
Dunedin, New Zealand’s is where you will find Baldwin Street, the steepest residential street in the world. At a modest 350 meters (1,150 ft) long, what it lacks in length, it makes up for in slope.
The 161.2 metres (529 ft) long top section climbs 47.2 metres (155 ft) vertically, an average gradient of 1:3.41. At its maximum, about 70 metres (230 ft) below the top, the slope of Baldwin Street is about 1:2.86 (19° or 35%). That is, for every 2.86 metres travelled horizontally, the elevation changes by 1 metre.
The street’s steepness was unintentional. As with many other parts of early Dunedin, and indeed New Zealand, streets were laid out in a grid pattern with no consideration for the terrain, usually by planners in London. In the case of Baldwin Street (and much of the Dunedin street plan), the layout was surveyed by Charles Kettle in the mid-19th century. The street is named after William Baldwin, an Otago Provincial Councillor and newspaper founder, who subdivided the area. [source]