Stone arch bridge (Skew, 1833) 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 bridge on the S. side of the road. (7-13-06, N40 27.19 W78 32.59) Photos by Jack Schmidt.