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I-405 - Construction Updates

Last update: 6:45 a.m. Monday, 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

NB S 260th St to Duwamish River Br Concrete Pavement Rehab and ADA - #8992

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 0.00
Contact: Mike Askarian, Project Engineer, 206-768-5861
Description: WSDOT contractor crews are rehabilitating northbound I-5 between South 260th Street in Des Moines and the Duwamish River Bridge in Tukwila.
Project website
Work schedule:

  • No lane or ramp closures are scheduled.
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 website
Work schedule:

LANE CLOSURES

  • Monday, Sept. 18, to the morning of Sunday, Sept. 24 – Three lanes of northbound I-405 from SR 167 to Talbot Road South will be closed nightly from 11 p.m. to 5 a.m.
  • Monday, Sept. 18, to the morning of Sunday, Sept. 24 – Three lanes of southbound I-405 from SR 169 to SR 167 will be closed nightly from 11 p.m. to 5 a.m.

RAMP CLOSURES

  • * Monday, Sept. 18, to the morning of Friday, Sept. 22 – The southbound I-405 ramp to southbound SR 167/Rainier Avenue South will be closed nightly from 11 p.m. to 6 a.m. A signed detour will be in place.
  • * Monday, Sept. 18, to the morning of Friday, Sept. 22 – The Talbot Road South 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. 18, to the morning of Friday, Sept. 22 – The southbound I-405 off-ramp to Talbot Road South will be closed nightly from 10 p.m. to 4:30 a.m. A signed detour will be in place.
  • * Monday, Sept. 18, to the morning of Friday, Sept. 22 – The northbound I-405 ramp to northbound SR 167 will be closed nightly from 10 p.m. to 4:30 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, Sept. 18, to the afternoon of Friday, Sept. 22 – One lane of southbound Talbot Road South between the northbound I-405 on-ramp to the southbound I-405 off-ramp will be closed daily from 9 a.m. to 3 p.m.
  • Monday, Sept. 18, to the morning of Friday, Sept. 22 – Talbot Road South between the northbound I-405 on-ramp to the southbound I-405 off-ramp will be FULLY CLOSED from 10 p.m. to 4:30 a.m. Signed detours will be in place for both the southbound and northbound directions of Talbot Road South.
NE 6th St to I-5 Widening and Express Toll Lanes Project - #8204

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 19.00 - 21.00
Contact: Craig Smiley, Communications, 425-456-8624
Description: WSDOT contractor crews are building a continuous new northbound and southbound ETL between Northeast 6th Street in Bellevue and SR 522 in Bothell.
Project website
Work schedule:

LANE CLOSURES

  • No lane closures are scheduled.

RAMP CLOSURES

  • No ramp closures are scheduled.
Northbound Peak Use Shoulder Lane Project, SR 527 to I-5 - #8886

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 23.67 - 30.30
Contact: Craig Smiley, Communications, 425-456-8624
Description: WSDOT contractor crews are building a peak-use shoulder lane between SR 527 and I-5.
Project website
Work schedule:

LANE CLOSURES
 

  • No lane closures are scheduled.

RAMP CLOSURES

  • No ramp closures are scheduled.

CITY STREET CLOSURES

  • No city street closures are scheduled.
Bothell Rolling Slowdowns

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 24.52 - 30.30
Contact: Mark VanOss, Seattle City Light, 206-684-3279
Description: Seattle City Light crews are hanging electrical cables above I-405 near SR 527 in Bothell.
Work schedule:

  • **HIGH IMPACT** Monday, Sept. 18, to the morning of Friday, Sept. 22 - Crews will perform intermittent 15-minute rolling slowdowns in both directions of I-405 between I-5 and 195th Street from 11:59 p.m. to 4 a.m. nightly.