State Route 410

When the current state highway numbering system was first posted in January 1964, US 410 functioned as SR 410 in Washington State. US 410 started at Jct US 101 in Aberdeen and headed east via Montesano, Elma, and McCleary to Mud Bay, a half dozen miles west of Olympia. At Mud Bay, US 101 joined US 410 and the coincident routes headed east to Jct I-5/US 99 at Exit 104, where US 101 ended. At Exit 104, US 410 joined I-5/US 99 and headed NE from the Olympia area to Tacoma. In Tacoma near M St, US99/US 410 left I-5 and followed the pre freeway route thru town until I-5 was completed the rest of the way to Fife in 1966. Near the Puyallup River, US 410 left I-5 at Exit 135 and headed out River Rd to Puyallup and continued east via Sumner, Bonney Lake, and Buckley to Enumclaw. From Enumclaw, US 410 followed the Chinook Pass Highway thru the NE quarter of Mount Rainier National Park and crested the Cascades at Chinook Pass. East of the pass, US 410 descended the east slope via Naches to Yakima. At Yakima, US 410 joined US 97. The two highways passed thru Union Gap and split at Buena. From Buena, US 410 continued down the Yakima Valley via Sunnyside, Grandview, and Prosser to Kennewick. US 410 crossed the Blue Bridge from Kennewick to Pasco. At Pasco, US 395 joined US 410. The two joined routes headed SE from Pasco via Burbank and Wallula to Wallula Junction. At Wallula Junction, US 730 started and US 395 left US 410 and joined US 730 heading SE to Oregon. US 410 headed east via Walla Walla, Dayton, Pomeroy, and Clarkston to the Idaho State Line.

US 12 was extended west from Missoula, Montana to Lewiston, Idaho in 1963 after the Lolo Pass highway was paved in Summer 1962. US 12 was extended west to Aberdeen, Washington in late 1967. Most of US 410 was renumbered US 12. The route of US 12 across the Cascades departed from the route of former US 410, however. From Elma, US 12 leaves former US 410 and heads SE to I-5 Exit 88 at Grand Mound. US 12 runs coincident with I-5 from Exit 88 to Exit 68. At Exit 68, US 12 leaves I-5 and heads east over White Pass to the Naches area, where US 12 rejoins the route of former US 410. Former US 410 from Elma to Mud Bay is now SR 8 and from Mud Bay to Olympia just US 101. I-5 links Olympia and Tacoma. Former US 410 from Tacoma to the Naches area became SR 410 when US 410 was decertified as a US Highway. In 1973, the portion of SR 410 from Tacoma to Sumner was redesignated as part of SR 167. Today, SR 410 begins at Jct SR 167 in Sumner and ends at Jct US 12 near Naches. SR 410 is 107.44 miles long.