(Old Route 22) WNW of Duncansville, Allegheny Township, Blair County, PA. Old Route 22 W. (curves NW) 6.3 miles from jct with US22 on the W. side of Duncansville to the tunnel on the S. side of the road. (N40 27.188 W78 32.573) Photo by Jack Schmidt 7-13-06.