The $5-billion SR 520 Bridge Replacement and HOV Program completely rebuilds, expands, and modernizes the SR 520 freeway and bridges from I-405 across Lake Washington to I-5 and South Lake Union, while maintaining service on the existing facility.
Major phases and projects include:
- Full program preliminary engineering and NEPA/SEPA environmental approval
- Program strategic planning (defining phasing, funding, and implementation)
- SR 520 Eastside Transit and HOV Design-Build Project
- SR 520 Montlake Interchange to Lake Washington Design-Build Project
- SR 520 Floating Bridge and Landings Project
- West Connection Bridge and West Approach Bridge North
- Portage Bay and 2nd Montlake Bascule Bridges, I-5 and Montlake interchanges, and the North Capitol Hill and Montlake Lids
- Bridge and Pontoon Casting Yard, Grays Harbor County
For nearly two decades, Parametrix has been a leading partner on the WSDOT GEC team, helping to manage and deliver this 13-mile multi-jurisdictional program from design and environmental clearance, siting and determination of alignments, engineering design, implementation and phasing, through APD and construction. Parametrix has provided many project roles:
- Program management and administrative support
- Engineering
- Landscape architecture and urban design
- Traffic engineering
- Transportation planning
- Stormwater management
- Structural engineering
- Environmental planning
- Design-build project procurement and oversight
- Construction management
