I-405 construction

Last update: 11:15 a.m. Friday, April 2

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, April 5, to the morning of Saturday, April 10 – Up to two lanes of northbound I-405 between North Southport Drive and Northeast 44th Street will be closed nightly from 9 p.m. to 7 a.m.
  • Monday, April 5, to the morning of Saturday, April 10 – One lane of northbound I-405 between North 30th Street and Northeast 44th Street will be closed nightly from 9 p.m. to 7 a.m.
  • Tuesday, April 6, to the morning of Wednesday, April 7 – One lane of southbound I-405 between I-90 and Coal Creek Parkway Southeast will be closed overnight from 10:30 p.m. to 5 a.m.
  • Wednesday, April 7, to the morning of Thursday, April 8 – Up to two lanes of northbound I-405 between SR 181 and SR 167 will be closed overnight from 11 p.m. to 4:30 a.m.
  • Thursday, April 8, to the morning of Friday, April 9 – Up to two lanes of northbound I-405 between Coal Creek Parkway Southeast and Northeast Sixth Street will be closed overnight from 9 p.m. to 5 a.m.

Ramp closures

  • Monday, April 5, to the morning of Friday, April 9 – The northbound I-405 on-ramp from North 30th Street will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Monday, April 5, to the morning of Friday, April 9 – 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.
  • Tuesday, April 6, to the morning of Wednesday, April 7 – The southbound I-405 off-ramp to Coal Creek Parkway Southeast will be closed overnight from 10:30 p.m. to 5 a.m. A signed detour will be in place.
  • Tuesday, April 6, to the morning of Wednesday, April 7 – The westbound I-90 ramp to southbound I-405 will be closed overnight from 10:30 p.m. to 4:30 a.m. A signed detour will be in place.
  • Tuesday, April 6, to the morning of Wednesday, April 7 – The southbound I-405 off-ramp to SR 167 will be closed overnight from 9 p.m. to 4:30 a.m. A signed detour will be in place.
  • Thursday, April 8, to the morning of Friday, April 9 – The southbound I-405 off-ramp to North Southport Drive will be closed overnight from 9:30 p.m. to 4:30 a.m. A signed detour will be in place.
  • Thursday, April 8, to the morning of Friday, April 9 – The northbound I-405 HOV off- ramp to Northeast Sixth Street will be closed overnight from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Friday, April 9, to the morning of Saturday, April 10 – The northbound I-405 on-ramp from North 30th Street will be closed overnight from 9 p.m. to 7 a.m. A signed detour will be in place.
  • Friday, April 9, to the morning of Saturday, April 10 – The northbound I-405 off-ramp to Northeast 44th Street will be closed overnight from 9 p.m. to 7 a.m. A signed detour will be in place.

City street closures

  • No city street closures are currently scheduled.

Trail closures

  • Ongoing through May 2021 – The King County Eastrail will be closed in both directions between Ripley Lane North in Renton and 106th Avenue Southeast in Bellevue. Trail users will be detoured to the parallel Lake Washington Loop Trail.
  • Ongoing through May 2021 – The King County Eastrail will be closed in both directions between 106th Avenue Southeast and Lake Washington Boulevard Southeast near Newcastle Beach Park. There is no available pedestrian detour route; bicyclists will be directed to 106th Avenue Southeast and Lake Washington Boulevard.

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. 

    I-405 maintenance

    Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 13 - 30
    Contact: DiAngelea Millar, Communications, 206-440-4457
    Description: WSDOT contractor crews will pave I-405.
    Work schedule:

    • No lane or ramp closures scheduled.