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I-5 Willamette River Bridge Replacement (Whilamut Passage)

Project Info

Client Oregon Dept. of Transportation

Project Description

I-5 Willamette River Bridge Replacement (Whilamut Passage)

Interstate 5 Bridges, Eugene/Springfield, Oregon

Start Date: May 2009
End Date: December 2013


Oregon Department of Transportation’s I-5 Willamette River Bridge project included the construction of two new, uniquely designed arch bridges on I-5 over the Willamette River. Approximately 1,800 feet long each, the structures feature a combination of deck arch and cast-in-place box girder spans. The project also included the construction of a pedestrian/bicycle viaduct path along the riverbank and the realignment of a highly traveled bike path. As the prime contractor, Hamilton was responsible for all in-water work, utility relocation, and the demolition and removal of the old structure. The project area bordered neighboring cities, spanned a section of river housing a historical millrace, crossed the UPRR track, and encompassed a protected section of the public natural area. These factors required attention to detail, careful coordination, multi-agency collaboration, and continuous public outreach.

Our involvement during the preconstruction stage led to the success of the project; we assisted ODOT with community and stakeholder
involvement, cost management, project scheduling, constructability reviews, environmental permitting, and traffic control plans. The two interstate bridges were completed four months ahead of schedule, and the project completed under budget. Our constant communication with stakeholders and the community, the calculated traffic management strategies, and our team’s overall responsiveness were critical to the success of the project.