View entire map. Project area is along I-5 beginning at SR 121 (Maytown Road, Exit 95) and south to SR 12 (Grand Mound).
View drawing of I-5/SR 121 interchange improvements(Maytown).
Revisions to the I-5/US 12 Grand Mound interchange is a separate project. Learn more.
This is one of a series of projects to widen I-5 in both directions in Lewis and Thurston counties.
The project realigns the curve south of the Grand Mound Interchange on I-5, increasing the driver distance. The result will be improved driver comfort and safety.
The additional lanes provide much-needed congestion relief. In 1968 an average of 17,000 vehicles per day used this section of the highway. Today, that number is nearly 80,000.
Partnerships & Cooperation
Thurston County Waste Management provided funding of $56,930 for this project.
Dennis Engel, Project Engineer
WSDOT Tumwater Project Office
821 Airport Court SE
Tumwater, WA 98501-6805
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