Amphitheatre Bridge (1931) is the largest of 17 bridges constructed along 57 miles of carriage road on Mount Desert Island between 1917 and 1940. It carries Amphitheatre Road (Asticou-Jordan Pond Road) -- which itself had been abandoned for ten years due to the objections of summer residents -- near the Little Harbor Brook waterfall.

The masonry-arch bridge is 245-feet long and 27-feet at its highest point over the Little Harbor Brook. The asymmetrically curved plan and 32-foot arch was specifically designed to retain two large trees and align the axis of the arch with the waterfall.

It is constructed of quarry-faced, random-coursed ashlar granite over a reinforced-concrete substructure. Each elevation displays two vertical rows of large projecting rectangular blocks. The parapet walls gradually slope to a peak above the arch and are pierced with horizontal rectangular openings below heavy capstones with dressed edges. A turret with a viewing balcony overlooks the bridge and ravine at the east end of the south parapet wall.