PA 917 begins at an intersection with US 40 in North Bethlehem Township, heading east on two-lane undivided Bull Run Road. The road heads through forests before entering the borough of Cokeburg, where it passes through wooded areas of homes in the southern part of town. Upon leaving Cokeburg, the route heads into Somerset Township and runs through a mix of farmland and woods, passing under a Norfolk Southern railroad line. PA 917 heads into the borough of Ellsworth and becomes South Main Street, making a turn north into areas of homes and businesses. The route progresses north through the town and becomes North Main Street. The road winds east into the borough of Bentleyville, becoming Main Street. PA 917 curves to the north past more development and crosses Norfolk Southern's Ellsworth Secondary line into the commercial downtown. The route forks north onto Pittsburgh Road and passes homes before heading into wooded areas and coming to an interchange with I-70. Past this interchange, the road crosses back into Somerset Township and heads into agricultural areas with some trees and residences. PA 917 turns northeast into more forested surroundings and enters Fallowfield Township, becoming an unnamed road. The route continues north through more woodland with some residences, reaching its northern terminus at PA 136 in Ginger Hill.[3][4]
US 40 in North Bethlehem Township
I-70 in Bentleyville
PA 136 in Fallowfield Township
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