Thurston County construction and travel updates

Thurston County

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I-5 - SR 510 Interchange - Reconstruct Interchange
I-5 Region: Olympic County: Thurston Location: Milepost(s) 110 to 112.5
Contact: Doug Adamson, 360-357-2716
Description:  Crews are converting the existing interchange into a diverging diamond interchange. Depending on the weather, the work could be complete by late 2020. All users of this interchange are strongly encouraged to sign up to receive WSDOT email updates and see more at the project webpage.


  • Single-lane closure for northbound I-5 exit to Marvin Road. One lane will remain open.

9 p.m. Friday, Feb. 21 to 5 a.m. Monday, Feb. 24 - Weekend closure cancelled 

  • ​The around-the-clock closure of the Marvin Road on-ramp to southbound I-5 has been canceled due to weather and will be rescheduled to the next dry weekend. 
  • If the weather cooperates, the busy on-ramp will close to all traffic at 9 p.m. Friday, Feb. 28. The around-the-clock closure will continue until 5 a.m. Monday, March 2. 

I-5/I-5 Over Pacific Avenue - Seismic Retrofit
I-5 Region: Olympic County: Thurston Location: Milepost(s) 107
Contact: Brian Whitehouse, 360-412-3420
Description: This project is intended to help reduce potential damage in the event of an earthquake by strengthening four columns that support bridged sections of I-5. This project is part of WSDOT’s seismic retrofit program established to help make bridges less susceptible to earthquake related damage.
Work Schedule: See below: 

Around the clock:

  • Eastbound Pacific Avenue is reduced to one lane approaching the overpass. One sidewalk is closed around the clock. One sidewalk remains open for pedestrians and bicyclists. 

8 p.m. Monday, Feb. 24

  • Crews will establish a detour for users of the westbound Pacific Avenue sidewalk and close a single lane of westbound Pacific Avenue. The around-the-clock lane closure will allow crews to create a new work zone for an earthquake retrofit project. Crews at the same time will remove the lane and sidewalk closure for travelers using eastbound Pacific Avenue. The work will not affect Interstate 5 or the Pacific Avenue off- or on-ramps.

I-5 - Olympia Area Southbound - Congestion Management
I-5 Region: Olympic County: Thurston Location: Milepost(s) 109 to 105
Contact: Doug Adamson, 360-357-2716
Description: Shoulder closures at four on-ramps to southbound I-5 between Martin Way in Lacey and Henderson Boulevard in Olympia. WSDOT will activate the ramp meters during April. Project web page
Work Schedule: Occasional daytime shoulder closures.