WSDOT outlines I‑5/170 Ninth Street interchange plan, schedules construction for 2029–2031
Washington State Department of Transportation officials presented a design for the I‑5/170 Ninth Street interchange that would replace signals with roundabouts, rebuild two bridges, add shared-use paths and a fish‑passage channel, and aims to advertise construction in 2028 with work beginning in 2029.
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Laura, a project lead with the Washington State Department of Transportation, gave a detailed update on the I‑5/170 Ninth Street interchange improvements project and said, “The interchange project will improve safety and mobility at the interchange, by replacing the existing signals that are out there today with roundabouts.”
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