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I-5: Beltline Flyover - Completed flyover bridge

I-5: Beltline Interchange Flyover

Eugene/Springfield, Oregon

This flyover was part of a larger interchange modernization that exemplified seamless coordination among contractors, consultants, agencies, and the public to deliver this complex effort. The project was the largest ODOT project in Lane County at the time, requiring OBEC designers to work hand-in-hand with ODOT staff to develop bridge and roadway designs, right-of-way permits, and environmental permitting. OBEC's designs meshed with roadway, traffic, and illumination designs prepared by ODOT.

The resulting solution included this flyover: a multi-span, post-tensioned, cast-in-place, multi-celled concrete box girder. The new interchange configuration improved safety and capacity by eliminating a short weave section on northbound I-5. The superstructure was constructed in less than six months to minimize traffic interruptions and to meet ODOT's obligations to a nearby new hospital development that contributed significant project funding.

OBEC encountered varied challenges, but was able to develop an attractive, cost-effective, and durable concrete structure. It is an engineering achievement that meets the unique and growing transportation needs of the local residents and commercial truckers.


Completed 2008

Oregon Department of Transportation

2,400-foot 'Flyover' Bridge Design
Construction Engineering Support