SR 109 has an intersection with US 6, east of Napoleon. The highway crosses US 6 and continues north, until a T-intersection at SR 110. Both SR 109 and SR 110 head east parallel to the Maumee River. The concurrency passes under a railroad track owned by the Indiana and Ohio Railway. SR 109 leaves SR 110, heading north and crosses over the Maumee River. On the northside of the river the road enters woodland, before an intersection with Old US 24. SR 109 turns due west onto Old US 24, before turning due north again. The route passes farmland, with some woodland, and has an interchange with US 24.