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February 10, 2025

Best in State - Gold Award: Complexity

Photo from ACEC Washington [enlarge]
The new 3-span bridge was constructed just 10 feet west of the existing structure above the fast-moving Raging River.

Stantec

Raging River Bridge (I-90, SR 18I/C to Deep Creek)

Aecon/Washington State Department of Transportation

The Raging River Bridge is a key component of the larger Design/Build I-90, state Route 18 Interchange to Deep Creek Widening Project, aimed at improving traffic flow, safety and reducing congestion at the interchange of I-90 and SR 18. The project included constructing a four-lane Diverging Diamond Interchange (DDI) and widening SR 18, which currently only has one lane in each direction, contributing to high crash rates and fatalities due to the lack of a median barrier.

The $15 million Raging River Bridge, a complex design and construction task, features a 334-foot, 3-span bridge located just 10 feet west of the existing structure. It provides 54 feet of clearance above the fast-moving Raging River, and rests on two-column bent shafts that are socketed 75 feet into glacial till.

The bridge is also situated 44 feet below high-voltage overhead electrical lines carrying up to 500kV, crucial for powering several Washington population centers. The construction process involved a two-crane operation for girder erection and a temporary steel pass-over crossing over the river to facilitate the work.

The Raging River Bridge serves a critical transportation route, with heavy truck traffic transporting goods to and from the Port of Tacoma, Washington’s largest port and the 7th largest in the nation. The bridge is designed according to WSDOT’s new scour policy for stream and bridge protection, advancing the understanding of building sustainable bridges in highly seismic areas subject to severe stream and scour effects.

Stantec was the prime consultant and structural engineer of record, with Aecon as the contractor. Stantec led the final design and construction support, collaborating with subconsultants PBS (stream design and environmental permitting), Perteet (civil work), and Haley Aldrich (geotechnical investigations). The bridge was substantially completed on October 25, 2024.


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