Since 2003, WSDOT and the US Highway 12 Coalition have made significant progress towards widening US 12 from two to four lanes between the Snake River (near Burbank) to Walla Walla. Phase 8 will complete the approximately 10 miles of new four-lane divided highway that remain between Packaging Corporation of America and Nine Mile Hill.
What to expect
Traffic delays will only occur during construction of the Attalia area interchange and connection with the new section of US 12. The majority of work will take place away from the highway.