State Route 409 (SR 409) is a short Washington state highway in Wahkiakum County. The highway runs north from the Wahkiakum County Ferry on Puget Island to SR 4 in the county seat of Cathlamet over a distance of 3.84 miles (6.18 km). The route connects Westport, Oregon, which is served by the county ferry, and Cathlamet.
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