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
Financial Information
The information shown below reflects the current approved project budget and schedule.
- Transportation 2003 Account (Nickel Funding)
- $176.8 million
2005 Gas Tax (Partnership Funding) - $20.9 million
In 2005, the Washington State Legislature provided $20 million towards this project by passing the Transportation Partnership Funding package.
Other Agency Funds - $2.3 million: These funds are provided by the City of Bellevue and Federal sources.
Total Funding Available From All Sources - $200 million
Contact Us
Steve Peer
I-405 Corridor Program
600 - 108th Avenue NE
Suite 405
Bellevue, WA 98004
425-456-8624
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