I-405 construction

Last update: 4:15 p.m. Friday, May 29

This information changes frequently. Please check back often. Travelers can also call 5-1-1 for real-time traffic and weather updates. If you have questions or comments about I-405 in Washington state that are not addressed by these resources, please contact the I-405 Project Office at 425-456-8585.

I-405, Renton to Bellevue Widening and Express Toll Lanes Project - #9242

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 0.00 - 14.6
Contact: Craig Smiley, Communications, 425-456-8624
Description: WSDOT contractor crews are adding one new lane between SR 167 in Renton and Northeast Sixth Street in Bellevue to create a dual express toll lane system.
Project webpage
Work schedule:

Lane closures

  • * Friday May 29 – There will be corridor-wide, temporary shoulder closures on northbound and southbound I-405 from 9 a.m. to 2 p.m.
  • ** Friday, May 29, to the morning of Saturday, May 30 – The HOV left lane and shoulder of southbound I-405 between Coal Creek Parkway and Lake Washington Boulevard Southeast will be closed from 11 p.m. to 7 a.m.
  • Monday, June 1, to the afternoon of Thursday, June 4 – There will be corridor-wide, temporary shoulder closures on northbound and southbound I-405 from 9 a.m. to 2 p.m.

WSDOT has granted time extensions for certain closures due to lower traffic volumes. Crews may take advantage of these extended work hours, if necessary, to complete all work.

* Times may be extended to 8 a.m. to 4 p.m. if necessary.

** Times may be extended to 7 p.m. to 5 a.m. if necessary.

Ramp closures

  • Friday, May 29, to the morning of Saturday, May 30 – The northbound off-ramp and shoulder from I-405 to Lake Washington Boulevard Southeast will be closed from 9 p.m. to 7 a.m. A signed detour will be in place.
  • Friday, May 29, to the morning of Saturday, May 30 – The northbound off-ramp from I-405 to Northeast 44th Street, and the right lane and shoulder of northbound I-405 approaching Northeast 44th Street, will be closed from 10 p.m. to 7 a.m. from Northeast 30th Street to Northeast 44th Street. A signed detour will be in place.
  • Monday, June 1, to the morning of Thursday, June 4 – The northbound off-ramp and shoulder from I-405 to Lake Washington Boulevard Southeast will be closed from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Monday, June 1, to the morning of Friday, June 5 – The southbound off-ramp from I-405 to Northeast 44th Street, and the right lane and shoulder of southbound I-405 between Lake Washington Boulevard Southeast and Northeast 44th Street, will be closed nightly from 10:30 p.m. to 5 a.m. A signed detour will be in place.
  • ** Thursday, June 4, to the morning of Friday, June 5 – The southbound off-ramp from I-405 to Lake Washington Boulevard Southeast, and the right lane and shoulder of southbound I-405 between Coal Creek Parkway Southeast and Lake Washington Boulevard Southeast, will be closed from 10:30 p.m. to 5 a.m. A signed detour will be in place.

** This closure is tentative.

City street closures

  • No city street closures are scheduled.

Trail closures

  • No trail closures are scheduled.

I-405/SR 167 Interchange Direct Connector - #8811

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 2.32 – 3.96
Contact: Craig Smiley, Communications, 425-456-8624
Description: WSDOT contractor crews are building a new flyover ramp connecting the HOT lanes on SR 167 to the carpool lanes on I-405 in Renton. This ramp will improve traffic flow and safety at this critical interchange.
Project webpage
Work schedule:

Lane closures

  • No lane closures are scheduled

Ramp closures

  • No ramp closures are scheduled

City street closures

  • No city street closures scheduled at this time.

    Sound Transit's East Link Extension - E320

    Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 10.65
    Contact: Charlie Hockett, Sound Transit, (206) 553-3736
    Description: Sound Transit crews are constructing the East Link light rail extension from Seattle to Redmond.
    Project webpage
    Work schedule:

    • No lane or ramp closures scheduled. 

    Renton to Bellevue Culvert Surveillance Project

    Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 10.65 - 11.25
    Contact: Craig Smiley, Communications, 425-456-8624
    Description: WSDOT contractor crews will inspect storm drains along I-405 from Renton to Bellevue.
    Work schedule:

    • No lane or ramp closures scheduled.