Overview
The I-405 - South Bellevue Widening Project, also known as the 112th Avenue SE to SE 8th Street Project, helps relieve congestion at one of the worst I-405 bottlenecks—the drive in and out of Bellevue. Between May 2007 and September 2009:
- Added a new northbound lane from 112th Avenue SE to I-90.
- Widened the existing northbound bridge over Coal Creek Parkway.
- Built a new lane in each direction from I-90 to SE Eighth Street. Removed the Wilburton Tunnel.
- Built a new, three-lane, southbound bridge over I-90.
- Converted the existing southbound bridge over I-90 to carry the northbound carpool lane.
 | Improves Safety
The project improves traffic merge conditions and increases freeway capacity.
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 | Relieves Congestion
The added lanes on I-405 increase general purpose capacity and improve traffic flow.
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 | Protects Environment
The project provides noise mitigation, created a new stream channel, enhanced wetlands and wildlife habitat, and improves water quality by treating highway stormwater runoff.
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Partnerships & Cooperation
Funding
The South Bellevue Widening Project is funded at $193.2 million. Additional funds shown above reflect money spent on related WSDOT projects.
Contact Us
Steve Peer
I-405 Corridor Program
600 - 108th Avenue NE
Suite 405
Bellevue, WA 98004
425-456-8624
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