Transportation

Bridges and Structures

I-5 McKenzie River to Goshen Grade Design-Build Project

Location: Eugene, Oregon

This roadway reconstruction and bridge replacement project on I-5 in the Eugene-Springfield metropolitan area of Oregon began design in the spring of 2006, and construction was completed in November 2009. The project included replacing six bridges and rebuilding two interstate freeway interchanges. Two of the replaced bridges currently carry four lanes of I-5 traffic over the McKenzie River just north of Eugene. The replacement bridges carrying northbound and southbound traffic are both six-span pre-stressed girder structures with the interior bents founded on two-column bents supported on deep drilled shafts and are constructed to carry six lanes of traffic. The longest span crossing the main river channel is 180 feet and utilizes 90-inch pre-stressed beams. The approach spans are all 72-inch-deep beams that are haunched at each interior bent.

DEA’s design and inspection work on this project also included twin replacement bridges (northbound and southbound) of I-5 traffic over the CORP Railroad and Franklin Boulevard. immediately south of Eugene. The Franklin Blvd/CORP Railroad Bridge required significant railroad and utility coordination. These bridges were two spans, heavily skewed, and in a spiral horizontal curve. Two additional multilane, single-span I-5 bridges were replaced at the Goshen Grade Interchange, with the interchange being redesigned and reconstructed. These bridges were constructed in stages due to limited work space. I-5 was raised approximately 8 feet as part of this project to accommodate additional railroad clearance and beam depths. Additional elements of this project included open and closed drainage work, extensive retaining walls, 35,000 tons of HMAC paving, earthwork, new roadway construction, guardrail, complex traffic control with over 10 stage shifts, rock excavation and blasting, fencing, durable striping and legends, permanent signage, drilled shafts, driven pile, augured pile, sign bridges, bridge demolition, extensive environmental monitoring, park restoration, and landscaping.

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