I-405 construction

Last update: 8:50 a.m. Friday, Feb. 14 

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:

  • Wednesday, Jan. 22 to the morning of Friday, Jan. 24 – The Northeast 44th Street on-ramp to southbound I-405 will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Monday, Jan. 27 to the morning of Wednesday, Jan. 29 – The Northeast 44th Street on-ramp to southbound I-405 on-ramp will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Wednesday, Jan. 29 to the morning of Friday, Jan. 31 – The northbound I-405 off-ramp to Northeast 44th Street will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place. A signed detour will be in place.
  • Monday, Feb. 3 to the morning of Friday, Feb. 7 – The northbound I-405 off-ramp to Northeast 44th Street will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place. A signed detour will be in place.

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:

  • No work scheduled at this time.

* Please note that not all the listed ramps will be closed at the same time. Select ramps will remain open to maintain a working detour for the traveling public.

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:

    • Wednesday, Jan. 22, to the morning of Friday, Jan. 24 – The 44th Street on-ramp to southbound I-405 will close from 9 p.m. to 5 a.m. nightly.