I-405 construction

Last update: 10:30 a.m. Tuesday, March 5

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/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 at this time.

Ramp closures

  • No ramp closures are scheduled at this time.

* Please note that not all the listed ramps will be closed at the same time. Select ramps will remain open to maintain a working detour for the traveling public.

City street closures

  • Monday, Feb. 25, to the afternoon of Friday, Mar. 1 – One lane of southbound Talbot Road South between the northbound I-405 on-ramp and the southbound I-405 off-ramp will be closed from 4:30 a.m. to 3:30 p.m.

Renton Maintenance 

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 4.19
Contact: Joseph Calabro, communications, 206-440-4452 
Description: WSDOT bridge maintenance crews are repairing portions of the northbound I-405 bridge deck over Northeast 3rd Street in Renton.
Work schedule:

  • High Impact: Friday, March 1, to the morning of Sunday, March 3 - Northbound I-405 at Northeast 3rd Street will be reduced to one lane from 10 p.m. to 8 a.m. nightly. This work is weather-dependent. 

Sound Transit's East Link Extension - E320

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 10.65
Contact: Jason Hampton, Sound Transit, 206-903-7177
Description: Sound Transit crews are constructing the East Link light rail extension from Seattle to Redmond.
Project webpage
Work schedule:

  • Tuesday, March 19, to the morning of Friday, March 22 – The southbound I-405 ramp to the westbound I-90 HOV lane will be closed from 8 p.m. to 5 a.m. nightly.
  • Tuesday, March 19, to the morning of Friday, March 22 – The northbound I-405 ramp to westbound I-90 will be closed from 10 p.m. to 5 a.m. nightly.
  • Tuesday, March 19, to the morning of Friday, March 22 – The southbound I-405 ramp to westbound I-90 will be closed from 10 p.m. to 5 a.m. nightly.

Sound Transit's East Link Extension - E335

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 10.65 - 14.85
ContactJay Cooper, WSDOT Regional Transit Coordination, 206-716-1102; Ryan Lescouflair, Sound Transit, 206-689-4798
Description: Sound Transit crews are constructing the East Link light rail extension from Seattle to Redmond.
Project webpage
Work schedule:

  • Thursday, March 28, to the morning of Friday, March 29 – The southbound I-405 collector-distributor lane on- and off-ramps to and from Northeast 6th Street will be closed from 10 p.m. to 5 a.m. nightly.

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:

  • Monday, Feb. 25, to the morning of Tuesday, Feb. 26 - The right lane of southbound I-405 at Lake Washington Boulevard Southeast will be closed from 10 p.m. to 4 a.m.
  • Tuesday, Feb. 26, to the morning of Wednesday, Feb. 27 - The right lane of southbound I-405 between SR 900 and Northeast 30th Street will be closed from 10 p.m. to 4 a.m.

Bothell Maintenance 

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 23.67
Contact: Thomas Charlson, Communications, 206-440-4699 
Description: WSDOT maintenance crews are installing signage.
Work schedule:

  • Saturday, March 23, to the morning of Sunday, March 24 – The southbound I-405 ramp to eastbound SR 522 will be closed from 11 p.m. to 8 a.m. nightly.