(Bull Run Crossing, 24', 38-02-f) across Thompson Run in West Mifflin, Allegheny County, PA. Thompson Run Rd. NE 1.05 miles from jct with Buttermilk Hollow Rd. to the bridge on the E. (right) side of the road. (N40 22.003 W79 53.403) Photos by Glenn-Allen Wilker 3-31-22.