The 11.05 miles (17.78 km) of SR 107 that lie within the state serve as a minor highway.

SR 107 heads east from its western terminus as a two-lane rural highway passing through farmland with some houses.

The route crosses the St. Joseph River and enters the downtown business district of Montpelier.

The concurrency heads east leaving the business district and ending residential areas.

The road leaves Montpelier and enters rural Williams County, passing through farmland with a few houses.