I-405 construction

Last update: 3:20 p.m. Friday, Feb. 21 

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

  • Monday, Feb. 24, to the morning of Wednesday, Feb. 26 The right lane and shoulder of northbound I-405 between the Northeast 30th Street and Northeast 44th Street will be closed nightly from 9 p.m. to 4:30 a.m.
  • Thursday, Feb. 27, to the morning of Saturday, Feb. 29 – The right lane and shoulder of northbound I-405 will be closed between the Northeast 30th Street and Northeast 44th Street interchanges. The lane closure will begin at 9 p.m. each night. It will end by 4:30 a.m. on Friday, Feb. 28 and by 7 a.m. on Saturday, Feb. 29

Ramp closures

  • Thursday, Feb. 27 to the morning of Friday, Feb. 28 – The Northeast 44th Street on-ramp to southbound I-405 will be closed from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Friday, Feb. 28 to the morning of Saturday, Feb. 29 – The Northeast 44th Street on-ramp to southbound I-405 will be closed from 9 p.m. to 7:30 a.m. A signed detour will be in place.

Trail closures

  • Wednesday, Feb. 19 to Friday, March 6 Flaggers will direct people using the Lake Washington Loop Trail north of Newcastle Beach Park during short periods of daytime work.

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

  • Tuesday, Feb. 25, to the morning of Sunday, March 1 – Two lanes of northbound I-405 between SR 167 and Talbot Road South will be closed nightly from midnight to 4:30 a.m.

Ramp closures

  • Tuesday, Feb. 25, to the morning of Sunday, March 1 –  The Talbot Road South on-ramp to northbound I-405 will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.

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.