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Thurston County, Washington

The content on the Thurston County website is currently provided in English. We are providing the “Translation” for approximately 10 languages. The goal of the translation is to provide visitors with limited English proficiency to access information on the website in other languages. The translations do not translate all types of documents, and it may not give you an exact translation all the time. The translations are made through an automated process, which may not result in accurate or precise translations, particularly of technical and legal terminology.
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OLYMPIA – Thurston County Public Works will close US 12, from Pecan Street SW to Old Highway 99 SW/Elderberry Street SW, for the pavement marking of the new roundabout intersection at Sargent Road. The closure is scheduled for May 24, from 8 p.m. to 6 a.m. During the overnight closure, detours will be in place to guide motorists around the affected area.

The completion of the roundabout will add an additional north-south crossing of US 12, improving traffic flow for current and planned developments. The additional route option will enhance emergency response and provide better alternative routes during road maintenance. The project is scheduled to be completed in 2023.

The residents and businesses of Grand Mound, Rochester, and the surrounding area rely on US 12 daily to access services, jobs, and more. To learn more about this project, visit 

For any questions or concerns regarding the traffic revisions or construction, contact Thurston County Construction Engineering & Support Manager Steve Bricker at or 360-867-2300.

Drivers are reminded to follow posted speed limits and use caution while driving in work zones.


Public Works
Press Release
Announcements, Closures, Construction

Questions and inquiries regarding News Release content should be directed to the Thurston County Public Information Officer:  

Meghan Porter


Anna Rhoads