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Smithfield Street Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1880-1889DateCreated: 1883Monongahela RiverPittsburghState: PAZip: 15222Country: USAWebsite: http://www.asce.org/Project/Smithfield-Street-Bridge/Creator: Lindenthal, Gustav

Three rivers - the Allegheny, Monongahela, and Ohio - join in Pittsburgh, making the city a natural site for the building of bridges. But the Smithfield Street Bridge stands apart from other Pittsburgh bridges for several reasons: it replaced structures by two well-known bridge engineers, Lewis Wernwag and John A. Roebling; it was the first use in America of the lenticular - or lens-shaped - truss design; and it was one of the first major bridges in the U.S. built primarily with steel.

YearAdded:
1975
Image Credit: Courtesy Flickr/RJ Schmidt (CC BY-ND 2.0)Image Caption: Smithfield Street BridgeEra_date_from: 1883
John A. Roebling Bridge
Society: ASCEMain Category: CivilSub Category: BridgesEra: 1860-1869DateCreated: 1866Ohio RiverCincinnatiState: OHCountry: USAWebsite: http://www.asce.org/Project/John-A--Roebling-Bridge/Creator: Roebling, John

In 1866, the Covington and Cincinnati Suspension Bridge was the largest suspension bridge in the world. Also called the Ohio Bridge, it was officially renamed the John A. Roebling Bridge in 1983. It was the first permanent bridge over the Ohio River and the only public project in America financed by private investors during the Civil War.

Renowned bridge designer John A. Roebling proposed the structure in 1846; but building the bridge would become a 20-year saga, with heated lobbying both for and against the crossing.

YearAdded:
1982
Image Credit: Courtesy Flickr/Tom Hamilton (CC BY 2.0)Image Caption: John A. Roebling BridgeEra_date_from: 1866
Davis Island Lock and Dam
Society: ASCEMain Category: CivilSub Category: Water TransportationEra: 1880-1889DateCreated: 1885Davis IslandMcKees RocksState: PAZip: 15136Country: USAWebsite: https://www.asce.org/project/davis-island-lock---dam/Creator: U.S. Army Corps of Engineers

Before the Davis Island Lock & Dam were built, the flow of the Ohio River slowed to little more than a trickle during dry periods. For several months each year, the unreliable flow stranded Pittsburgh's steamboats, towboats, and barges.    

The Davis Island Lock & Chanoine Dam experimental project was the first lock and dam ever constructed on the Ohio River. Its achievements also included the first rolling lock gates, the largest movable dam built in the 19th century, and the widest chamber in world history.    

YearAdded:
1985
Image Credit: Public Domain (National Park Service)Image Caption: Davis Island Lock and DamEra_date_from: 1885
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