The Mount Washington Auto Road (originally Mount Washington Carriage Road) is a 7.6 mi (12.2 km) toll road that extends from New Hampshire Route 16 in Pinkham Notch to the summit of Mount Washington in the White Mountains of the US state of New Hampshire. The road climbs 4,618 ft (1,408 m) from an altitude of 1,527 ft (465 m) at the bottom to 6,145 ft (1,873 m) at the top, an average gradient of 11.6%.