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January 27, 2025
US 12 - Nine Mile Hill to Frenchtown Vic
Guy F. Atkinson Construction
The project built a four-lane divided highway with 11 bridges and two full-diamond interchanges, providing a direct route between Wallula Junction and Walla Walla. Grade-separated median crossovers were added at four intersections to improve safety by separating local and through-traffic. The design achieved an 88% obstruction-free clear zone and reduced maintenance costs.
Atkinson shortened the three-span bridge over the Touchet River for durability and performed quality assurance, earning bonus incentives. The project replaced three at-grade crossings with interchanges, enhancing safety for local residents and agricultural traffic. Community meetings ensured alignment with local preferences and improved access and signage.
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