I-405 construction

Last update: 3:10 p.m. Thursday, July 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 and ramp closures

  • Monday, July 6, to the morning of Tuesday, July 7 The right lane of southbound I-405 between Coal Creek Parkway Southeast and Lake Washington Boulevard Southeast, and the southbound off-ramp to Lake Washington Boulevard Southeast, will be closed overnight, from 10:30 p.m. to 5 a.m. A signed detour will be in place.
  • * Monday, July 6, to the morning of Wednesday, July 8 – The HOV left lane and shoulder of northbound I-405 between Northeast 44th Street and Coal Creek Parkway Southeast will be closed nightly from 8:45 p.m. to 5 a.m.
  • ** Monday, July 6, to the morning of Wednesday, July 8 – The HOV left 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.
  • ** Monday, July 6, to the morning of Wednesday, July 8 The right lane and shoulder 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, July 6, to the morning of Wednesday, July 8 The northbound on-ramp to I-405 from Northeast 44th Street, and the northbound right lane and shoulder of I-405 between Northeast 44th Street and Lake Washington Boulevard Southeast, will be closed nightly from 9 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, July 6, to the morning of Wednesday, July 8 The right lane and shoulder of northbound I-405 approaching Lake Washington Boulevard Southeast, and the northbound off-ramp from I-405 to Lake Washington Boulevard Southeast, will be closed nightly from 9 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, July 6, to the morning of Thursday, July 9 – The westbound right lane of I-90 approaching I-405, the I-90 westbound off-ramp to I-405 northbound (exit 10), and the I-405 northbound right lane & shoulder north of I-90 will be closed nightly from 10:30 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, July 6, to the morning of Friday, July 10 The right lane and shoulder of southbound I-405 between Northeast 44th Street and Northeast 30th Street, the southbound I-405 on-ramp from Northeast 44th Street, and the southbound I-405 off-ramp to North 30th Street, will be closed nightly from 10:30 p.m. to 5 a.m. Signed detours will be in place.
  • Monday, July 6, to the morning of Friday, July 10 – The westbound right lane of I-90 approaching I-405, the I-90 westbound on-ramp to I-405 southbound (exit 10), the right lane of southbound I-405 between I-90 and Coal Creek Parkway Southeast, and the southbound I-405 off-ramp and shoulder to Coal Creek Parkway Southeast will be closed nightly from 10:30 p.m. to 4:30 a.m. A signed detour will be in place.

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 p.m. to 4:45 a.m. if necessary.

** Times may be extended to 8:30 p.m. to 5 a.m. if necessary.

City street closures

  • No city street closures are planned.

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.