I-405 construction

Last update: 4:20 p.m. Monday, Aug. 10

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, Aug. 10, to the morning of Wednesday, Aug. 12 – One lane of southbound I-405 between Main Street and Northeast Fourth Street will be closed nightly from 9 p.m. to 5 a.m.
  • * Monday, Aug. 10, to the morning of Wednesday, Aug. 12 –  One lane of southbound I-405 between North 30th Street and North Southport Drive will be closed nightly from 10:30 p.m. to 5 a.m.
  • * Monday, Aug. 10, to the morning of Friday, Aug. 14 – One lane of southbound I-405 between I-90 and Coal Creek Parkway Southeast will be closed nightly from 9 p.m. to 5 a.m.
  • ** Monday, Aug. 10, to the morning of Friday, Aug. 14 – One lane of southbound I-405 near the West Valley Highway exit ramp will be closed nightly from 9:30 p.m. to 4:30 a.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 8:30 p.m. to 5 a.m. if necessary.

** Times may be extended to 9:30 p.m. to 5 a.m. if necessary.

Ramp closures

  • Monday, Aug. 10, to the morning of Wednesday, Aug. 12 – The North 30th 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, Aug. 10, to the morning of Wednesday, Aug. 12 – The Northeast Sixth 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, Aug. 10, to the morning of Friday, Aug. 14 – The northbound SR 167 ramp to southbound I-405 will be closed nightly from 11 p.m. to 3:30 a.m. A signed detour will be in place.
  • Monday, Aug. 10, to the morning of Friday, Aug. 14 – The southbound I-405 off-ramp to the West Valley Highway will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.

City street closures

  • Monday, Aug. 10, to the morning of Friday, Aug. 14 – In Renton, Houser Way North will be reduced to one lane between North Southport Drive and North 8th Street. Flaggers will control traffic.
  • Monday, Aug. 10, to the morning of Friday, Aug. 14 – In Bellevue, one lane of eastbound and westbound Main Street between 112th Avenue Southeast and 116th Avenue Southeast will be closed nightly. 

Trail closures

  • Ongoing through fall 2020 – 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.

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) 17.4 - 24
    Contact: DiAngelea Millar, Communications, 206-440-4457
    Description: WSDOT contractor crews will pave I-405.
    Work schedule:

    • Monday, August 3 to the morning of Tuesday, August 4 – The northbound I-405 off-ramp to NE 195th Street will close from 9 p.m. to 5 a.m.
    • Tuesday, August 4 to the morning of Wednesday, August 5 – The NE 195th Street on-ramp to southbound I-405 will close from 9 p.m. to 5 a.m.
    • Wednesday, August 5 to the morning of Thursday, August 6 – The NE 70th Street on-ramp to northbound I-405 will close from 9 p.m. to 5 a.m.
    • Thursday, August 6 to the morning of Friday, August 7 – The northbound I-405 off-ramp to NE 70th Street will close from 9 p.m. to 5 a.m.