Construction begins on I-405 widening project

On Monday, July 9, WSDOT will begin construction to widen I-405 within the city of Bellevue between 112th Avenue SE (exit 9 near the park and ride) and SE 8th Street.

You may notice construction activity as crews shift lanes on I-405 to set up work zones and move in heavy construction equipment. Ramp alignments may also change to accommodate construction. All lanes on I-405 will remain open during the day with a few lanes closed at night.

The I-405 South Bellevue Widening Project will help relieve congestion at one of the worst I-405 bottlenecks by adding lanes and improving merging conditions through the drive in and out of downtown Bellevue.

The project is divided into two stages:

Stage 1: July 2007 - June 2008
Between 112th Ave SE and I-90

• Add a new northbound lane from 112th Ave SE to I-90
• Build a new, three-lane, southbound bridge over I-90
• Widen the existing northbound bridge over Coal Creek Parkway

Stage 2: March 2008 - August 2009
Between I-90 and SE 8th

• Build one new lane in each direction from I-90 to SE 8th Street
• Remove the Wilburton Tunnel
• Convert the existing southbound bridge over I-90 to carry the northbound HOV lane

For more information visit the WSDOT I-405 Widening Project Website.