Sawhill RunSawhill Run is a long 2nd order tributary to Buffalo [Creek (Ohio River tributary)|Buffalo Creek] in Washington County, Pennsylvania. This is the only stream of this name in the United States.CourseSawhill Run rises about 1.5 miles south of Claysville, Pennsylvania, in Washington County and then flows generally east to join Buffalo Creek about 3 miles southeast of Claysville.WatershedSawhill Run drains of area, receives about 40.5 in/year of precipitation, has a wetness index of 300.98, and is about 57% forested.