King County construction

Last update: 8:30 a.m. Friday, July 10

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

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.

Eastbound SR 18 Maintenance

Highway: SR 18    Region: Northwest    County: King    Location: Milepost(s) 11.80 - 15.69
Contact: Angie Millar, communications, 206-440-4457
Description: WSDOT maintenance crews will repave the connections to the bridge over Southeast 240th Street in Maple Valley. 
Work schedule:

  • Saturday, May 30, to the evening of Sunday, May 31 - Eastbound SR 18 between SR 516 and 231st Street will close from 7 a.m. Saturday to 7 p.m. Sunday. 

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

Utility Work

Highway: SR 167    Region: Northwest    County: King    Location: Milepost(s) 22.64 - 24.42
Contact: Joseph Calabro, communications, 206-440-4452
Description: PSE utility crews will cross wires over SR 167. 
Work schedule:

  • No lane or ramp closures are scheduled.

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, July 13, to the afternoon of Thursday, July 16 - A single lane of westbound SR 202 at Sydney Avenue North will close from 9 a.m. to 3 p.m.

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.
  • Wednesday, July 15 - SR 203 will close with a signed detour between Northeast 124th Street and Northeast Carnation Farm Road from 4:30 a.m. to 4 p.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:

  • Monday, June 15 to the morning of Tuesday, June 16 – The southbound I-405 HOV ramp to northbound I-5 will close from 9 p.m. to 4 a.m.
  • Tuesday, June 16 to the morning of Wednesday, June 17 – The right lane of southbound I-5 at I-405 will close from 10 p.m. to 5 a.m.
  • Thursday, June 18 to the morning of Friday, June 19 – The southbound I-405 HOV ramp to northbound I-5 will close from 9 p.m. to 4 a.m.
  • Thursday, June 18 to the morning of Friday, June 19 – The HOV lane on northbound I-5 at I-405 will close from 9 p.m. to 4 a.m.

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:

  • Tuesday, June 16, to the morning of Friday, June 19 - Single lane and ramp closures on SR 518 at I-5 and I-5 from 9 p.m. to 5 a.m. nightly. 

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.