State Route 410 (SR 410, partially named the Chinook Scenic Byway, and also named the Stephen Mather Memorial Parkway) is a long state highway that traverses Pierce, King, and Yakima counties in the US state of Washington. It begins at an interchange with SR 167 in Sumner and travels southeast across the Cascade Range to a junction with U.S. Route 12 (US 12) in Naches. While the western part of SR 410 is a freeway that serves built-up, urban areas, the remainder of the route is a surface road that traverses mostly rural areas as it passes through the mountains. The route starts as a limited-access southerly bypass of Downtown Sumner, but becomes a surface road east of the city. Traveling eastward, the roadway serves Bonney Lake and Buckley, and crosses and eventually parallels the White River into Enumclaw and Greenwater. SR 410 enters the Mount Baker-Snoqualmie National Forest and later heads into Mount Rainier National Park, crossing the Cayuse and Chinook passes, and leaves the park southeast along the American River into Wenatchee National Forest. SR 410 leaves the national forest and travels parallel to the Naches River to end in Naches, a city located west of Yakima. The Chinook Scenic Byway begins in Enumclaw and follows the highway through the two national forests and Mount Rainier National Park to US 12 in Naches. Modern SR 410 was parts of various state wagon roads until 1926 when US 410 was established, extending from Aberdeen to Lewiston, Idaho. US 410 was decommissioned after US 12 was extended over the majority of the highway in 1967, bypassing Olympia and Chinook Pass. A segment of former US 410 from Elma to Olympia became SR 8 and the Tacoma to Naches segment became SR 410. The highway was later shortened to end in Sumner and was replaced by SR 167 from Tacoma to Sumner. Route description SR 410 begins as a freeway at an interchange with SR 167 near Downtown Sumner. The highway travels southeast across suburban areas, crossing the Stuck River and passing a partial cloverleaf interchange with Linden Drive, also named Traffic Avenue. After a second partial cloverleaf interchange with Thompson Avenue, SR 410 goes under a railroad trestle owned by BNSF Railway and used by Amtrak's Cascades rail service, near the northern bank of the Puyallup River. After turning northeast, SR 410 encounters the western terminus of SR 162 by