I-405 construction

Last update: 10:30 a.m. Monday, May 20

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

  • Monday, May 20, to the morning of Friday, May 24 – Two lanes of northbound I-405 between SR 167 and the Benson Bridge will be closed nightly from midnight to 4:30 a.m.
  • Monday, May 20, to the morning of Friday, May 24 – Two lanes of southbound I-405 between the Benson Bridge and SR 167 will be closed nightly from 11 p.m. to 4:30 a.m.

Ramp closures

  • Wednesday, May 22, to the morning of Friday, May 24 – The northbound SR 167 general purpose 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, May 20, to the morning of Tuesday, May 21 – The northbound I-405 ramp to northbound SR 167 will be closed nightly from 10 p.m. to 4 a.m. A signed detour will be in place.
  • Wednesday, May 22, to the morning of Friday, May 24 – The northbound I-405 ramp to southbound SR 167 will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, May 20, to the morning of Wednesday, May 22 – The southbound I-405 ramp to Rainier Avenue South will be closed nightly from 10 p.m. to 4 a.m. A signed detour will be in place.
  • Monday, May 20, to the morning of Wednesday, May 22 – The southbound I-405 ramp to southbound SR 167 will be closed nightly from 11 p.m. to 4:30 a.m. A signed detour will be in place.
  • Monday, May 20, to the morning of Wednesday, May 22 – The northbound SR 167 HOV ramp to northbound I-405 will be closed nightly from 9 p.m. to 7 a.m. A signed detour will be in place.
  • Wednesday, May 22, to the morning of Saturday, May 25 – The southbound I-405 HOV ramp to southbound SR 167 will be closed nightly from 8 p.m. to 5 a.m. A signed detour will be in place.

* 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, May 20, to the afternoon of Friday, May 24 – One lane of northbound East Valley Road between Southwest 19th Street and Taylor Avenue Southwest will be closed from 8 a.m. to 3:30 p.m.
  • Monday, May 20, to the afternoon of Wednesday, May 22 – One lane of southbound Talbot Road South between the southbound I-405 off-ramp and Puget Drive South will be closed from 4:30 a.m. to 3:30 p.m.

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:

  • Monday, May 20, to the morning of Friday, May 24 – The northbound I-405 ramp to westbound I-90 will close from 10 p.m. to 5 a.m. nightly.
  • Monday, May 20, to the morning of Friday, May 24 – The southbound I-405 ramp to westbound I-90 will close from 10 p.m. to 5 a.m. nightly.
  • Monday, May 20, to the morning of Friday, May 24 – The southbound I-405 ramp to the westbound I-90 HOV lane will close from 8 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:

  • No lane or ramp closures are 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 work scheduled at this time.

I-405 - Drilling from SR 522 to SR 527

Highway: I-405    RegionNorthwest    County: King    Location: Milepost(s) 23.3 - 26.75
Contact: Thomas Charlson, communications, 206-440-4699
Description: WSDOT crews are performing drill work from SR 522 to SR 527.
Work schedule:

  • Monday, May 20, to the morning of Tuesday, May 21 – The right lane of northbound I-405 between Snohomish/King County line and 236th Street Southeast will close from 11:59 p.m. to 2 a.m.
  • Monday, May 20, to the morning of Thursday, May 23 – The right lane of southbound I-405 at SR 527 will close from 11:59 p.m. to 2 a.m. nightly.
  • Wednesday, May 22, to the morning of Thursday, May 23 – The left HOT lane of southbound I-405 at 236th Street Southeast will close from 11:59 p.m. to 2 a.m. nightly.