Chinook Scenic Byway

State Route 410
A map of the Cascade Range northeast of Mount Rainier and surrounding foothills with SR 410 highlighted in red.
Route information
Defined by RCW 47.17.610
Maintained by WSDOT
Length:	107.44 mi (172.91 km)
Existed:	1967 – present
Tourist routes:	Chinook Scenic Byway
Major junctions
West end:	SR 167 in Sumner
	SR 165 in Buckley SR 164 in Enumclaw SR 123 at Cayuse Pass
East end:	US 12 in Naches
Location
Counties:	Pierce, King, Yakima
Highway system
State highways in Washington Interstate US State Scenic Former PSH 1964 renumbering Former ← SR 409 SR 411 →

State Route 410 (SR 410, partially named the Chinook Scenic Byway, and also named the Stephen Mather Memorial Parkway) is a 107.44-mile (172.91 km) 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.