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Skanska Awarded I-405 Express Lane Extension in Washington

Washington, (Qnnflash) – Skanska, a well-known construction company, was recently awarded an $834-million design-build contract by the Washington State Dept. of Transportation and Sound Transit. This contract is set to bring significant improvements to a 4.5-mile section of Interstate 405 near Bothell, a suburb of Seattle, Washington.

The project, known as the I-405 Brickyard to SR 527 Improvement Project, aims to address congestion and enhance transportation options in the region. The highlight of the project involves the creation of extended dual express toll lanes on both sides of the freeway. This expansion will help alleviate traffic pressure on the general-purpose lanes east of Interstate 5. The express toll lane count will be increased from one lane to two lanes in both the northbound and southbound directions.

Skanska secured the project with a winning bid of $242 million over the estimated cost of $525 million, while a joint venture of Walsh and Canada-based Aecon submitted a bid of $1.84 billion for the same project. The selection process was based on a best value assessment, where technical scores were combined with price proposals to determine the most favorable bid.

Funding for the project will be sourced from toll revenue, the Move Ahead Washington transportation grant program, and Sound Transit. Construction is expected to commence in late 2023, with completion projected for 2028. The partnership with Sound Transit is crucial for the project’s success, as it aims to enhance accessibility and convenience by integrating with the regional transit service and Sound Transit’s bus rapid transit plans.

Upon completion of the I-405 Brickyard to SR 527 Improvement Project, the newly constructed lanes and freeway stations will be utilized by Sound Transit’s Stride bus rapid transit service, reducing congestion in the general-purpose traffic lanes. The project also encompasses the development of direct access ramps to the toll lanes at State Route 522 and a partial direct access interchange at State Route 527, which will connect to the Canyon Park Park-and-Ride and a future rapid transit station at the University of Washington-Bothell campus. Additionally, a new bridge will be constructed at the I-405/SR 522 interchange.

This project is part of the larger I-405/SR 167 Corridor Program, a comprehensive master plan aimed at improving travel between Lynnwood and the Renton/Tukwila area. The program includes the implementation of more than 50 miles of express toll lanes, regular lanes, and high-capacity transit options. The Washington State Dept. of Transportation has successfully delivered 16 projects valued at $1.5 billion from the master plan so far, with 10 more projects worth $2 billion currently in progress. The Brickyard to SR 527 Improvement Project, alongside the Renton-to-Bellevue Project, stands as one of the largest undertakings within the state DOT’s ambitious corridor improvement plan, which estimates a total investment of $4 billion for corridor improvements.

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