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Sellwood Bridge Replacement

Portland, Oregon

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Design, Seismic Analysis and Design



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Photo Credit: Tom Paiva Photography
Photo Credit: Tom Paiva Photography
Photo Credit: Tom Paiva Photography
Photo Credit: Tom Paiva Photography
Photo Credit: Tom Paiva Photography

T.Y. Lin International (TYLI) served as Prime Consultant for the Sellwood Bridge Replacement Project in Portland, Oregon. The project included the new 1976-foot-long crossing, 1,275 feet of which is a steel deck arch bridge; modernization of the Highway 43 interchange; and stabilization of the hillside located to the west of and above the bridge and interchange.

The new Sellwood Bridge replaces a narrow, inefficient continuous truss highway bridge that was built in 1925. Cracks had been discovered in the aging bridge girder and attributed to a nearby hillside that was sliding into the river, moving nearly four feet since the original bridge was constructed. As a result, a three-year planning process was launched to develop a replacement structure. TYLI served as the lead structural engineer during the Environmental Impact Study (EIS) Phase of the project.

Meeting the latest seismic engineering standards, the Sellwood Bridge features three arches that support the 63-foot-wide deck of the main river spans. The bridge carries two 12-foot-wide vehicular lanes, two 12-foot-wide shared use sidewalks, two 6.5-foot-wide bike lanes/emergency shoulders, multiple viewing areas, and a public art installation.

Project Highlights:

  • The fast-track project was delivered within a highly compressed timeframe.
  • During the EIS Phase, TYLI provided preliminary bridge engineering analysis and cost estimates to support the selection of a locally preferred alternative.
  • TYLI provided final structural design for the main arch spans and east approach structure, along with roadway and traffic design support.
  • As Project Manager, TYLI oversaw the bridge, roadway, electrical, architectural, geotechnical, and landslide mitigation design teams, performed construction engineering support, and led the project’s Quality Control Program.
  • Project challenges included balancing bridge design aesthetics, extensive public input, and owner agency desires with cost and function, and accommodating future plans for streetcar routes through the project.
  • The project received Greenroads Silver Certification, earning the highest score to date.
Prize Bridge Award, Major Span, 2018
National Steel Bridge Alliance (NSBA)
Construction Risk Partners Build America Award, Best New Highway and Transportation Project, 2018
Associated General Contractors of America (AGC)
Outstanding Project Award, New Bridges and Transportation Structures, 2017
National Council of Structural Engineers Association (NCSEA)
National Honor Award, 2017
American Council of Engineering Companies (ACEC)
Project of the Year, 2017
American Council of Engineering Companies of Oregon (ACEC-OR)
People's Choice Award, 2017
American Council of Engineering Companies of Oregon (ACEC-OR)
Project of the Year, 2017
Daily Journal of Commerce