I-405 construction

Last update: 9:20 a.m. Friday, Sept. 18

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, Sept. 14, to the morning of Wednesday, Sept. 16 – One lane of southbound I-405 between Coal Creek Parkway Southeast and Lake Washington Boulevard Southeast will be closed nightly from 10:30 p.m. to 5 a.m.
  • Monday, Sept. 14, to the morning of Thursday, Sept. 17 – Up to two lanes of southbound I-405 between the I-90 interchange and Coal Creek Parkway Southeast will be closed nightly from 9 p.m. to 5 a.m.
  • Monday, Sept. 14, to the morning of Thursday, Sept. 17 – One lane of northbound I-405 between Talbot Road and Cedar Street will be closed nightly from 10 p.m. to 4:45 a.m.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – 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 4:15 a.m.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – One lane of northbound I-405 between North 30th Street and Northeast 44th Street will be closed nightly from 9:45 p.m. to 4:30 a.m.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – One lane of northbound I-405 between Northeast 44th Street and Lake Washington Boulevard Southeast will be closed nightly from 9 p.m. to 4:30 a.m.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 Two lanes of southbound I-405 between Southeast Eighth Street and the I-90 interchange will be closed nightly from 8 p.m. to 5:30 a.m.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – One lane of southbound I-405 between the I-90 interchange and Coal Creek Parkway Southeast will be closed nightly from 9 p.m. to 5:30 a.m.

Ramp closures

  • Monday, Sept. 14, to the morning of Wednesday, Sept. 16 – The southbound I-405 off-ramp to Lake Washington Boulevard Southeast will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Monday, Sept. 14, to the morning of Thursday, Sept. 17 – The westbound I-90 ramp to southbound I-405 will be closed nightly from 10:30 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, Sept. 14, to the morning of Thursday, Sept. 17 – The Talbot Road 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.
  • Monday, Sept. 14, to the morning of Thursday, Sept. 17 – The Maple Valley Highway on-ramp to northbound I-405 will be closed nightly from 9 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – The North 30th Street on-ramp to northbound I-405 will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – 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.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – The northbound I-405 off-ramp to Lake Washington Boulevard Southeast will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.
  • Monday, Sept. 14, to the morning of Friday, Sept. 18 – The northbound I-405 off-ramp to Coal Creek Parkway Southeast will be closed nightly from 9 p.m. to 5 a.m. A signed detour will be in place.

City street closures

  • No city street closures are shceduled at this time.

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.
  • Ongoing through fall 2020 – 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:

     

    • Monday, Sept. 21 to the morning of Tuesday, Sept. 22 – The HOT lane of southbound I-405 at milepost 25.53 will close from 9 p.m. to 5 a.m.
    • Monday, Sept. 21 to the morning of Tuesday, Sept. 22 – The HOT lane of southbound I-405 at milepost 22.12 will close from 9 p.m. to 5 a.m.
    • Tuesday, Sept. 22 to the morning of Wednesday, Sept. 23 – The HOT lane of southbound I-405 at milepost 21.18 will close from 9 p.m. to 5 a.m.
    • Tuesday, Sept. 22 to the morning of Wednesday, Sept. 23 – The NE 128th on-ramp to southbound I-405 will close from 9 p.m. to 5 a.m.
    • Tuesday, Sept. 22 to the morning of Wednesday, Sept. 23 – The southbound I-405 off-ramp to NE 128th will close from 9 p.m. to 5 a.m.
    • Wednesday, Sept. 23 to the morning of Thursday, Sept. 24 – The HOT lane of southbound I-405 at milepost 17.67 will close from 9 p.m. to 5 a.m.
    • Wednesday, Sept. 23 to the morning of Thursday, Sept. 24 – The HOT lane of southbound I-405 at milepost 15.61 will close from 9 p.m. to 5 a.m.
    • Thursday, Sept. 24 to the morning of Friday, Sept. 25 – The HOT lane of southbound I-405 at milepost 13.79 will close from 9 p.m. to 5 a.m.
    • Thursday, Sept. 24 to the morning of Friday, Sept. 25 – The southbound I-405 off-ramp to NE 6th will close from 9 p.m. to 5 a.m.
    • Thursday, Sept. 24 to the morning of Friday, Sept. 25 – The NE 6th on-ramp to northbound I-405 will close from 9 p.m. to 5 a.m.