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Cast-iron

Dunlap's Creek Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1930-1939DateCreated: 1939Dunlap's CreekBrownsvilleState: PAZip: 15417Country: USAWebsite: http://www.asce.org/Project/Dunlap-s-Creek-Bridge/Creator: Delafield, Richard , U.S. Army Corps of Engineers

Not only was Dunlap's Creek Bridge the first cast-iron bridge in America, it was the first metal bridge anywhere to use what its builder, Capt. Richard Delafield, U.S. Army Corps of Engineers, described as "standardized, interchangeable, manufactured parts." The bridge was built as part of the federal government's effort to make repairs on the National Road  before handing authority over to the states. Dunlap's Creek at Brownsville was an especially troublesome crossing, having destroyed three previous bridges since 1801.

YearAdded:
1978
Image Credit: Public Domain (National Park Service)Image Caption: Dunlap's Creek BridgeEra_date_from: 1939
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