These rectangular, cut blocks of stone, or ashlars, were used to construct the Skew Arch Bridge. The material is sandstone. Skew Arch Bridge is listed on the National Register of Historic Places, as part of the Allegheny Portage Railroad National Historic Site.Galleries:Allegheny Portage Railroad, Arch BridgesKeywords:allegheny portage railroad, arch bridge, ashlars, bridge, gallitzin, pennsylvania, sandstone, skew arch bridgePhoto Location: Skew Arch Bridge, Allegheny Portage Railroad National Historic Site, PennsylvaniaPhotographer: Dr. Roy WinkelmanDate of Photo: 11/25/2011Device Make: CanonDevice Model: Canon EOS 5D Mark IIOriginal Dimensions: 5291×3528Picture Orientation: LandscapeGPS Coordinates: 40°27'11.00"N 78°32'34.23"WPicture Number: 15914
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