Planning study news
The US 12 Old Highway 9 Roundabout pre-design is underway, and we expect to complete it by the end of June 2025. WSDOT is collecting traffic data, which will inform the design options. We will work with project partners and the public to choose the design of the roundabout.
Timeline
January - June 2025
Status
In progress
Budget
$2,000,425
Purpose
WSDOT reviews intersections on the state highway system for safety. We look for the locations with the highest risk for severe crashes. That process identified the US 12/Old Highway 9 intersection for safety improvements. The recommendation is a single-lane roundabout. The pre-design process will find the best possible concept to proceed to the design phase.
The project location at US 12 and Old Highway 9 is located in Grand Mound, in the southwestern corner of Thurston County.