South Penn RunSouth Penn Run is a long first-order tributary to West Branch Tunungwant Creek. This is the only stream of this name in the United States.CourseSouth Penn Run rises about northwest of Lewis Run, Pennsylvania, and then flows east-southeast to meet West Branch Tunungwant Creek about northwest of Lewis Run, Pennsylvania.WatershedSouth Penn Run drains of area, receives about of precipitation, and is about 69.41% forested.