Washington State Route 507

State Route 507
SR 507 is highlighted in red.
Route information
Auxiliary route of I-5
Defined by RCW 47.17.670
Maintained by WSDOT
Length	43.52 mi (70.04 km)
Existed	1964 – present
Major junctions
South end	I-5 / US 12 in Centralia
	SR 510 in Yelm SR 702 in McKenna
North end	SR 7 in Spanaway
Highway system
State highways in Washington Interstate US State Scenic Former PSH 1964 renumbering Former ← SR 506 SR 508 →

State Route 507 (SR 507) is a Washington state highway in Lewis, Thurston and Pierce counties that extends 43.52 miles (70.04 km) from Interstate 5 (I-5) and U.S. Route 12 (US 12) in Centralia to SR 7 in Spanaway. The highway also intersects SR 510 in Yelm and SR 702 in McKenna. The first appearance of the roadway on a map was in 1916 and since, two highways, Secondary State Highway 5H (SSH 5H) and SSH 1N, were established on the current route of SR 507 in 1937 and 1943. They both became SR 507 during the 1964 highway renumbering.

State Route 507 (SR 507) begins at a diamond interchange with Interstate 5 (I-5), co-signed as U.S. Route 12 (US 12) in Centralia. Traveling east as Mellen, Alder and West Cherry Streets, the highway crosses railroad tracks owned by BNSF Railway and used by Amtrak's Cascades and Coast Starlight routes, both of which serve the Centralia Amtrak station. The roadway later intersects Pearl Street, the only couplet on SR 507, which parallels Tower Avenue through Downtown Centralia. The street then becomes Tower Avenue and turns north to pass the Centralia Amtrak station. SR 507 realigns west as Sixth Street to intersect and become Pearl Street, once again traveling northeast as Downing Road to leave Centralia. Still parallel to BNSF Railway tracks, the road leaves Lewis County, enters Thurston County, passes Bucoda and turns north to intersect an old segment of US 99 in Tenino. Within Tenino, the highway stops paralleling the BNSF tracks and goes east through the city as Sussex Avenue and starts to parallel a route of the Tacoma Rail eastward out of the city. Passing through Rainier as Binghampton Street, the roadway intersects the eastern terminus of SR 510 in Yelm and then turns southeast as Yelm Avenue, before leaving both Yelm and Thurston County to enter Pierce County on a bridge over the Nisqually River. Once in Pierce County, SR 507 intersects SR 702 in McKenna and continues north as the Spanaway McKenna Highway to Roy, where the highway turns east and then northeast into Fort Lewis. Immediately after leaving Fort Lewis, the roadway ends at an intersection with SR 7 in Spanaway. Between SR 510 in Yelm and SR 702 in McKenna, the roadway had an estimated daily average of 19,000 motorists in 2007, causing the segment to be the busiest on SR 507. The busiest segment in 1970 was the Maple Street junction in Downtown Centralia, with an estimated daily average of 14,000 motorists. SR 507 is also the southern segment of the East Pacific Highway, which runs from Centralia to Sumas.