Post by Bridge Monster

Many thanks to Suji Hwang for capturing and sharing this video!   The Broadway Bridge in Portland, Oregon, US is one of the few surviving examples of the Rall-type bascule bridge. Such a bridge combines rolling lift with longitudinal motion on trunnions when opening, i.e. the leaves move both up and back. The Rall type bascule bridge was patented by Theodor Rall in 1901. Towards the end of the video, another moving bridge of the Willamette River can be seen - the Steel Bridge, a through-truss, double-deck vertical-lift bridge.   Bridge facts! ⚡ 🔹Bridge type: Rall-type double-leaf bascule 🔹Length: 492 m (1613 ft) 🔹Bascule span length: 85 m (278 ft) 🔹Deck width: 21 m (70 ft)   Project facts! ⚡ 🔹Designer: Ralph Modjeski (overall bridge), Strobel Engineering Company (bascule span), Gustav Lindenthal (subsequent Lovejoy Street ramp & truss span modifications) 🔹Superstructure contractor: Pennsylvania Steel Co. 🔹Substructure contractor: Union Bridge and Construction Co. 🔹Construction years: 1911-12, approach added in 1927 🔹Completion: 22 April 1913 #BridgeEngineering #StructuralEngineering #CivilEngineering #MovableBridges #BasculeBridge #HistoricBridges #Infrastructure #EngineeringHistory #BridgeDesign #EngineeringCommunity #PortlandOregon #WillametteRiver

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