This large expansion project was needed to improve the heavily commuted corridor that was designed over 50 years ago. It includes access points for public transportation and a High Occupancy Vehicle lane in each direction. To improve safety and connectivity, large areas spanned across the highway. These large areas, called lids, are used for local traffic, pedestrian use, and transit access.
The Evergreen Point Rd lid supports the 520 Bridge View Park and provides parking, a bus station, access to the 520 Trail, and public open space. The 84th Ave lid supports a large roundabout for local traffic as well as a community gathering space and access to the 520 Trail. The 92nd Ave NE lid supports a convenient drop-off/pick-up location and access to a bus station and a nicely landscaped public open space. Bellevue Way and 108th Ave NE lids provide improved infrastructure and vehicle access across the highway.
Silver Award from the American Council of Engineering Companies of Washington
Quality of Life/Community Development Award from Western Association of State Highway and Transportation Officials
Excellence in Concrete Construction Award from Washington Aggregates and Concrete Association
Rated Top Ten Roads (#7) by Roads and Bridges Magazine
Economic member selection: The long “WF” girders provide some of the most efficient cross-sections in use today. All interior girders were designed for strength and practicality. Shorter products, such as the voided slabs provided cost-saving solutions to stream crossings and pedestrian bridges.
Formliner faced Tub girders: The use of tub girders on the exterior members was chosen to provide a clean, solid look to the lids as countless travelers drove beneath. The visible sides of these tubs contained a random board formliner finish to match the surrounding structures.
Accelerated construction: As the precast members were fabricated concurrently with the site work, there was no delay to erection of each lid. The Stay-in-Place panels were chosen to reduce forming and over-roadway work. Even a project of this size can be made, stored and delivered to minimize road closures and improve the overall timeframe.
WF95G Girders – 172 pcs – 19,205 LF
WF66G Girders – 12 pcs – 1,364 LF
WF42G Girders – 102 pcs – 7,650 LF
U83G Tub Girders – 12 pcs – 1,411 LF
U43G Tub Girders – 4 pcs – 299 LF
Stay-in-Place Panels – 1,754 pcs – 102,236 SF
36” Voided Slabs – 6 pcs – 2,445 SF
26” Voided Slabs – 4 pcs – 1,280 SF
18” Voided Slabs – 4 pcs – 809 SF