Thurston County construction and travel updates

Thurston County

  • Sign up for email updates for major roadwork on state highways in Thurston County. 


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 weather, work could be complete by late 2020. All users of this interchange are strongly encouraged to sign up for WSDOT email updates and see more at the project webpage.


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

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: 

Crews have reopened all lanes of westbound Pacific Avenue approaching the overpass.

Around the clock:

  • The westbound sidewalk is closed. A signed detour is available.

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. 
Work Schedule: No scheduled work that affects travelers. 

Highway: US 12 Region: Olympic County: Thurston Location: Milepost(s) 38.8 to 39.9
Contact: Chris Ehresmann, 360-570-6749
Description: Shoulder closures in both directions for utility work. 
Work Schedule: 9 a.m. until 3 p.m. Wednesday, April 8.