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.