(McKeesport Duquesne, 2,252', 1937) across Monongahela River in Duquesne, Allegheny County, PA. PA837 (Duquesne Av.) S. (curves W.) 1.0 miles from jct with Grant Av. in Duquesne, S. & the bridge. (N40 21.439 W79 50.634) Photo by Jack Schmidt 7-30-06.