RR bridge (West Branch Susquehanna River) across West Branch Susquehanna River W. of Montandon, West Chillisquaque Township, Northumberland County, PA. PA45 W. 1.7 miles from jct with PA147 on the E. side of Montandon, N. on PA405 200’ to the bridge to the west. (5-18-06, N40 58.08 W76 52.76) Photo by Jack Schmidt.