“Aecon has built large highway, civil, and private projects across the U.S. and Canada,” said Washington State Department of Transportation (WSDOT) Project Engineer Mark Allison. “This is a significant project and one the community has anticipated for a long time. We look forward to working with Aecon to build an interchange that will serve people for many years to come.”
The I-90/SR 18 improvement project is design-build, which means WSDOT executes a single contract with one firm for design and construction. Design-build projects offer efficiencies in cost and scheduling. Construction is expected to begin later this year with completion in 2025.
- Widening approximately two miles of SR 18 from the interchange to Deep Creek, creating two lanes in each direction
- Construction of a new four-lane bridge over Deep Creek and a new two-lane southbound bridge over Raging River
- Adding a dedicated right turn lane from southbound Snoqualmie Parkway to westbound I-90
Aecon Pacific Northwest, Inc. will begin work by completing design work for the interchange, a wider SR 18, new bridges, and improved fish passages. The $190-million project is funded through pre-existing gas tax funds and the 2015 Connecting Washington transportation fund, which is a $16-billion investment that enhances the statewide transportation system and maintains critical infrastructure.