January 27, 2025

Highway/Transportation $15 million to $50 million

Photo courtesy of Granite Construction

Despite over 100 changes to the original design, Granite completed the project 34 days ahead of schedule.

SR 520 - 148th Ave. Interchange Overlake Access Ramp

Redmond

Granite Construction Company

The Granite team fostered a collaborative environment founded on clear communication between all parties on the 148th Avenue Interchange Overlake Access Ramp project. Due to this strong partnership, all challenges were resolved at the project level, and despite over 100 changes to the original design, Granite completed the project 34 days ahead of schedule.

Prior to groundbreaking, Granite and WSDOT identified that the Construction Stormwater General Permit was necessary for earthwork to begin on site but would take up to 90 days to procure, postponing earthwork activities. Granite used this downtime to plan work and identify constructability concerns. Proactively identifying constructability concerns associated allowed Granite and WSDOT time to collaborate and determine solutions prior to work beginning.

To proactively identify and resolve additional constructability issues, Granite used GPS, CAD, and Agtek models throughout construction. This allowed Granite to identify the need for a temporary shoring wall which was necessary for construction of the new off-ramp alignment. Additionally, Granite identified a conflict between the location of the planned soldier pile wall and the new overhead Sound Transit guideway early in the project. Granite proactively worked with WSDOT and the designer to shift the alignments and relocate the piles for the wall to eliminate the conflict before construction on these components began.

Using Plan Grid on the project allowed Granite to share real-time project plans, issues, photos, and forms through iPads and phones, improving efficiencies in team communication and overall access to crucial project information.

Granite used innovative sequencing to improve the project schedule and complete work safely with less impact to the traveling public. To minimize impacts to traffic along 148th Avenue Northeast, Granite developed an innovative construction strategy using 30-foot-deep shoring next to live traffic, which allowed the team to build the tunnel in only two phases, while maintaining traffic around the active work zone. Granite also coordinated with local businesses, voluntarily resequencing work on new city streets and roundabouts next to the Overlake Village shopping mall to accommodate public access for an additional three months.

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