It is a 16.33 mi (26.28 km) secondary route that connects the towns of Baldwin and Bridgton.

It is overlapped with SR 11 for the southernmost 1.80 miles (2.90 km) of its length, following Bridgton Road due north between Woods Millpond and Sand Pond to an intersection with Sebago Road.

SR 107 turns northwest away from the nearby Sebago Lake, passing between Peabody Pond and Hancock Pond and traversing hilly terrain through the central part of town.

The route then turns north again, entering the town of Bridgton.

SR 107 runs through South Bridgton along South Bridgton Road before crossing Sandy Creek and ending at SR 117, less than 1 mile (1.6 km) west of U.S. Route 302.