Graham Contracting selected to deliver $455m Washington highway project

WCN Editorial Team 12 Oct 2018 NORTH AMERICA TRANSPORT INFRASTRUCTURE

The Washington State Department of Transportation (WSDOT) announced that Graham Contracting’s bid has been selected as the best-value proposal for the construction of the State Route 520 Montlake Project.

Graham Contracting’s bid of $455.3m was lowest of the three bids and is above WSDOT’s cost range of $375m to $425m. The other two proposals were submitted by Atkinson/Traylor JV and Kiewit Manson.

Furthermore, the winning proposal commits to completing the project earlier than WSDOT’s projected schedule. Graham also committed to reducing the project’s environmental and community impacts.

The design-build contract includes a new Montlake interchange, a landscaped lid over SR 520, a bicycle/pedestrian "land bridge" east of the lid, connecting the Arboretum to East Montlake Park and a West Approach Bridge South for eastbound traffic.

SR 520 Program deputy administrator Omar Jepperson said: "We know that costs have continued to escalate in this booming Puget Sound economy. Graham’s proposal combines a high technical score with the lowest cost, and we look forward to working with them.

"When complete, the new Montlake interchange and lid will be a community hub with multimodal transportation options for all. The new project will provide greater safety and reliability for drivers, transit riders, bicyclists and pedestrians."

WSDOT plans to award and execute the design-build contract in the near future. Construction on the project is expected to commence in early 2019 and will be completed in early 2023.

The Montlake Project represents the first of four SR 520 projects that make up the Rest of the West improvements which include: the second of two, parallel west approach bridges, landscaped highway lids in Seattle's Montlake and Roanoke neighborhoods, a new bicycle and pedestrian land bridge over SR 520.

The Rest of the West improvements also include a new bus/carpool connection between SR 520 and Seattle’s South Lake Union area, a new Portage Bay Bridge and a second bascule bridge over the Montlake Cut.

The projects were fully funded in 2015 in the Connecting Washington funding package.

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Image: An artistic rendering of an SR 520 bicycle/pedestrian land bridge in Montlake. Photo: Courtesy of WSDOT.

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