The Little Harbor Brook Bridge (1919) was the second of 17 bridges constructed along 57 miles of carriage road on Mount Desert Island between 1917 and 1940. It is located on Little Harbor Brook Road for a section of carriage road connecting Jordan Pond with Brown Mountain Road over a shallow and rocky brook deep in the woods.

It is one of three smaller masonry bridges with a single arch in Acadia that was modeled after a bridge at the end of Swan Lake in Central Park.

The reinforced-concrete segmental-arch bridge measures 41-feet 6-inches long, and 10-feet 4-inches at its highest point. The arch spans 18-feet 10-inches. 

Faced with roughly square granite stones laid in a random pattern, its parapet walls are capped with corbelled coping stones. The bridge terminates at each end in squared posts which are topped with a composite bevelled capstone. Arched parapet walls are flanked by square battered piers with pyramidal capstones. A datestone inscribed with the 1919 construction date is incorporated into the southwest pier. The wingwalls have scuppers that are both functional and ornamental.

The total cost of construction in 1919 is listed as $2,843.08.