State Route 158 is part of Maine's system of numbered state highways. It runs 4.42 miles (7.11 km) from an intersection with I-95 to an intersection with U.S. 2 in Sherman. The route is also known as Main Street and Woodbridge Corner Road.
Route 158 begins at an interchange with I-95 in Sherman. From there, the route heads through the city as Main Street until an intersection with Golden Ridge Road. From this intersection to the highway's eastern terminus at US 2, the route is known as Woodbridge Corner Road. The entire highway is in Sherman.