Reason RunReason Run is a long 1st order tributary to the Youghiogheny River in Fayette [County, Pennsylvania].CourseReason Run rises about 1 mile northeast of Asher [Glade, Maryland] in Garrett County, and then flows north-northeasterly into Fayette County, Pennsylvania to join the Youghiogheny River in Youghiogheny [River Lake] about 1.5 miles southwest of Somerfield.WatershedReason Run drains of area, receives about 46.7 in/year of precipitation, has a wetness index of 330.63, and is about 75% forested.