US 395 was part of the original US Highway system approved in 1926 but only from the Canadian Border to Spokane. The route was extended from Spokane to Oregon, California, Nevada, and back into California around 1936. As first extended, US 395 headed SSW from Spokane via Ritzville to Pasco, then SE via US 410 (now US 12) from Pasco to Wallula Junction, then SW via US 730 into Oregon. After I-82 was completed from Plymouth to the southern outskirts of Kennewick in 1985 and after the Blue Bridge between Kennewick and Pasco was renovated in 1986, US 395 was rerouted between Pasco and Oregon via its present route. This route follows I-182/US 12 west from Exit 14 to Exit 12A, then heads south via the Blue Bridge to I-82 Exit 113, continuing south via I-82 into Oregon. US 395 in Washington State is 246.38 miles long as of the year 2000.
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