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I-405 - Construction Updates

Last update: 12:20 p.m. Friday, March 24

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

SB S 320th St to Duwamish River Br Concrete Pavement Rehab - #8816

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 southbound I-5 between the Duwamish River Bridge in Tukwila and South 320th Street in Federal Way.
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:

RAMP CLOSURES 

  • Saturday, March 25, to the morning of Sunday, March 26 – The southbound SR 167 on-ramp to northbound I-405 will be closed from 10 p.m. to 6:00 a.m. A signed detour will be in place.
  • Saturday, March 25, to the morning of Wednesday, March 29 –The northbound SR 167 off-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.
  • Wednesday, March 29, to the morning of Friday, March 31 – 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.

LANE CLOSURES

  • Saturday, March 25, to the morning of Friday, March 31 – One lane of northbound I-405 between SR 167 and Talbot Road South on-ramp will be closed nightly from 10 p.m. to 4:30 a.m.
  • Saturday, March 25, to the morning of Friday, March 31 – One lane of northbound SR 167 between South 43rd Street and I-405 will be closed nightly from 9 p.m. to 4:30 a.m.
  • Saturday, March 25, to the morning of Sunday, March 26 – One lane of southbound SR 167 between I-405 and South 43rd Street will be closed from 9 p.m. to 4:30 a.m.
  • Wednesday, March 29, to the morning of Friday, March 31 – One lane of southbound I-405 between Talbot Road South and SR 167 will be closed nightly from 9 p.m. to 4:30 a.m.

CITY STREET CLOSURES

  • Monday, March 27, to the morning of Friday, March 31 – One lane of northbound East Valley Road between Southwest 19th Street and Maple Avenue Southwest to will be closed daily from 8:30 a.m. to 3:30 p.m.
I-405 NE 30th St & 44th St Ramp Improvements - #8959

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 6.40– 8.45
Contact: Mike Askarian, Project Engineer, 206-768-5681
Description: WSDOT contractor crews are widening two northbound I-405 ramps in north Renton at Northeast 30th Street and Northeast 44th Street.
Project website
Work schedule:

  • Monday, March 27, to Friday, March 31 - A single lane of the Northeast 30th Street on-ramp to northbound I-405 may be closed from 10 a.m. to 4 p.m. daily. This work is weather dependent.
  • Monday, March 27, to the morning of Friday, March 31 - The Northeast 30th Street on-ramp to northbound I-405 may be closed from 9 p.m. to 5 a.m. nightly. This work is weather dependent.
  • Monday, March 27, to the morning of Friday, March 31 - The Northeast 44th Street on-ramp to northbound I-405 may be closed from 9 p.m. to 5 a.m. nightly. This work is weather dependent.
Bellevue Maintenance Work

Highway: I-405    RegionNorthwest    County: King    Location: Milepost(s) 10.65
Contact: Nicole Daniels, Communications, 206-440-4479
Description: WSDOT maintenance crews are performing railing and vegetation trimming work on the southbound I-405 HOV off-ramp to westbound I-90 in Bellevue.
Work schedule:

  • Monday, March 27 – The southbound I-405 HOV off-ramp to westbound I-90 will be closed from 10 a.m. to 1 p.m.
I-405 - Northbound Peak Use Shoulder Lane Project, SR 527 to I-5 - #8886

Highway: I-405    Region: Northwest    County: King    Location: Milepost(s) 13.68 - 30.30
Contact: Craig Smiley, Communications, 425-450-2729
Description: WSDOT contractor crews are building a peak-use shoulder lane from SR 527 to I-5.
Project website
Work schedule:

LANE CLOSURES

  • Sunday, March 19, to the morning of Monday, March 20 - One left lane of southbound I-405 between I-5 and SR 527 will be closed from 8:30 p.m. to 5 a.m.
  • Monday, March 20, to the morning of Friday, March 24 - One right lane of northbound I-405 between SR 527 and I-5 will be closed from 9 p.m. to 5 a.m. nightly.
  • Tuesday, March 21, to the morning of Friday, March 24 - One left lane of southbound I-405 between I-5 and SR 527 will be closed from 8:30 p.m. to 4:30 a.m. nightly.
  • Friday, March 24, to the morning of Saturday, March 25 - One left lane of northbound I-405 between SR 527 and I-5 will be closed from 9 p.m. to 8 a.m.
  • Saturday, March 25, to the morning of Sunday, March 26 - One right lane of northbound I-405 between SR 527 and I-5 will be closed from 9 p.m. to 9 a.m.
  • Sunday, March 26, to the morning of Monday, March 27 - One right lane of northbound I-405 between SR 527 and I-5 will be closed from 9 p.m. to 5 a.m.

RAMP CLOSURES

  • No ramp closures are scheduled.