King County construction

Last update: 5 p.m. Friday, Aug. 7

This information changes frequently. Please check back often. Travelers can also call 5-1-1 for real-time traffic and weather updates.

If a highway is not listed below, there are no scheduled lane closures at this time, although emergency lane closures may still occur.

SR 18

Snoqualmie to Hobart - Westbound Pavement Repair

Highway: SR 18    Region: Northwest    County: King    Location: Milepost(s) 20.20 - 27.88
Contact: Joseph Calabro, communications, 206-440-4452
Description: WSDOT maintenance crews are grinding and repaving sections of westbound SR 18 between I-90 and Issaquah-Hobart Road. 
Work schedule:

  • Monday, Aug. 10, to the morning of Friday, Aug. 14 - Westbound SR 18 between I-90 and Issaquah-Hobart Road will close from 9 p.m. to 4:30 a.m. nightly. 
  • Monday, Aug. 17, to the morning of Friday, Aug. 21 - Westbound SR 18 between I-90 and Issaquah-Hobart Road will close from 9 p.m. to 4:30 a.m. nightly. 

EB Soosette Creek to Holder Creek Paving & Deck Overlay - #9345

Highway: SR 18    Region: Northwest    County: King    Location: Milepost(s) 8.90 - 20.42
Contact: Mike Askarian, Project Engineer, 206-768-5861
Description: WSDOT contractor crews are repaving eastbound SR 18 between Southeast 304th Street in Auburn and Southeast 256th Street in Covington. Crews are also resurfacing the westbound SR 18 overpass at Issaquah-Hobart Road.
Project webpage
Work schedule:

  • No lane or ramp closures are scheduled.

I-90/SR 18 Interchange Auxiliary Ramp - #9476

Highway: SR 18    Region: Northwest    County: King    Location: Milepost(s) 25.34 - 25.67
Contact: Mike Askarian, Project Engineer, 206-768-5861
Description: WSDOT contractor crews are modifying the existing Snoqualmie Parkway/SR 18 on-ramp to westbound I-90.
Work schedule:

  • No lane or ramp closures scheduled. 

SR 99

Downtown Seattle/SODO Construction Closures

Highway: SR 99    Region: Northwest    County: King    Location: Milepost(s) 29.00 - 34.30
Description: There are several projects affecting vehicle and pedestrian traffic on SR 99 and city streets through downtown Seattle and SODO.
Work schedule:

 SR 161 

Milton Rd Vic to SR 18 Paving & ADA Compliance - #9350

Highway: SR 161    Region: Northwest    County: King    Location: Milepost(s) 35.32 - 36-25
Contact: Mike Askarian, Project Engineer, 206-768-5861
Description: WSDOT contractor crews are grinding and repaving both directions of SR 161 between Milton Road South and SR 18 in Federal Way. Crews will also assess the transitions from sidewalks to crosswalks, known as curb ramps, and upgrade them when necessary to provide better sidewalk connections for people of all abilities.
Project webpage
Work schedule:

  • No lane or ramp closures scheduled. 

SR 167

I-405/SR 167 Interchange Direct Connector - #8811

Highway: SR 167    Region: Northwest    County: King    Location: Milepost(s) 24.80 - 26.26
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.
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 are scheduled. 

SR 202

Evans & Patterson Creek Fish Passage - #9269

Highway: SR 202    Region: Northwest    County: King    Location: Milepost(s) 11.74 - 19.78
Contact: Mike Askarian, Project Engineer, 206-768-5861
Description: WSDOT contractor crews are replacing four culverts that pass under SR 202 between Redmond and Fall City. 
Project webpage
Work schedule:

  • Monday, Aug. 3, to the evening of Tuesday, Aug. 4 - A flagger will alternate traffic on SR 202 near Northeast Ames Lake Road from 7 a.m. to 6 p.m. daily. 
  • Tuesday, Aug. 4, to the morning of Friday, Aug. 7 - A flagger will alternate traffic on SR 202 near Northeast Ames Lake Road from 8 p.m. to 6 a.m. nightly. 

SR 203

Maintenance between Carnation and Duvall

Highway: SR 203    Region: Northwest    County: King    Location: Milepost(s) 7.0 - 12.62
Contact: Frances Fedoriska, communications, 206-440-4690
Description: WSDOT geotechnical engineers will be assessing the soil beneath SR 203 to determine the cause of a slow-moving slide that has created cracks on the roadway. 

  • Until further notice - SR 203 between Northeast 124th Street in Duvall and Northeast Carnation Farm Road in Carnation is reduced to one open lane with alternating traffic through the single open lane.

Loutsis Creek Fish Passage - #9545

Highway: SR 203   Region: Northwest    County: King    Location: Milepost(s) 13.48 - 13.60
Contact: Shawn Wendt, Project Engineer, 425-225-8726
Description: To improve passage for native and migratory fish, contractor crews working for WSDOT will replace the culvert with an arched structure and build a more natural creek bed under the highway. 
Project webpage
Work schedule:

  • Until further notice - SR 203 at Loutsis Creek south of Duvall is closed with a signed detour

SR 410

White River Bridge maintenance

Highway: SR 410    Region: Northwest    County: King    Location: Milepost(s) 22.00
Contact: Joseph Calabro, communications, 206-440-4452
Description: WSDOT maintenance crews are inspecting and washing the White River Bridge. 
Work schedule:

  • Saturday, Aug. 8 - Alternating traffic on SR 410 at the White River Bridge in Buckley from 5 to 10 a.m.

SR 509

S 192nd St to Normandy Pk & SR 509 to SR 99 Paving & ADA & Deck & Seismic - #9357

Highway: SR 509    Region: Northwest    County: King    Location: Milepost(s) 22.38 - 22.97
Contact: James Harper, Project Engineer, 206-768-5862
Description: WSDOT contractor crews are repaving both directions of SR 509 between South 192nd Street and South Normandy Road in Normandy Park/Burien. Crews are also upgrading select curb ramps between Criminal Justice College and Southwest 185th Street in order to create better sidewalk connections for people of all abilities.
Project webpage
Work schedule:

  • No lane or ramp closures scheduled. 

SR 515

I-405/SR 167 Interchange Direct Connector - #8811

Highway: SR 515    Region: Northwest    County: King    Location: Milepost(s) 6.93
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:   

  • No lane or ramp closures are scheduled.

SR 518

S 192nd St to Normandy Pk & SR 509 to SR 99 Paving & ADA & Deck & Seismic - #9357

Highway: SR 518    Region: Northwest    County: King    Location: Milepost(s) 0.00 - 3.81
Contact: James Harper, Project Engineer, 206-768-5862
Description: WSDOT contractor crews are repaving both directions of SR 518 between South 154th Street in SeaTac and SR 509 in Burien. Crews are also seismically retrofitting two bridges on SR 518 and one bridge at the I-405/I-5 interchange.
Project webpage
Work schedule:

  • No lane or ramp closures are scheduled.

SR 522

City of Bothell Project - Stage 3

Highway: SR 522    Region: Northwest    County: King    Location: Milepost(s) 8.15 - 9.10
Contact: Kevin Stoll, Project Engineer, 425-806-6825
Description: This project is a continuation of the SR 522 Stage 1 and Stage 2 improvements. It will provide road improvements and business access and transit (BAT) lanes from the end of Stage 1 and 2 improvements to 83rd Place NE (the new western City limits). This stage of the project is part of the Sound Transit SR 522/NE 145th Bus Rapid Transit (BRT) project that will widen the existing lanes of SR 522 and create Business Access and Transit (BAT) lanes in both directions. Additionally, this project will add a sidewalk on the north side, install center medians and street lights, and relocate utilities underground.
Project webpage
Work schedule:

  • No lane or ramp closures scheduled.