Washington State Route 503

State Route 503
SR 503 is highlighted in red.
Route information
Auxiliary route of I-5
Maintained by WSDOT
Length	54.11 mi[1] (87.08 km)
Existed	1964[2]–present
Major junctions
South end	SR 500 in Orchards
Major intersections	SR 502 in Battle Ground
North end	I-5 in Woodland
Location
Country	United States
State	Washington
Counties	Clark, Cowlitz
Highway system
State highways in Washington Interstate US State Scenic Pre-1964 1964 renumbering Former
← SR 502 → SR 504

State Route 503 (SR 503) is a 54.11-mile-long (87.08 km) state highway serving Clark and Cowlitz counties in the U.S. state of Washington. The highway travels north from a short concurrency with SR 500 in Orchards through Battle Ground, the eastern terminus of SR 502, and communities in rural Clark County before crossing the Lewis River on the Yale Bridge. SR 503 intersects its spur route and turns west to parallel the Lewis River downstream to Woodland, where the highway ends at an interchange with Interstate 5 (I-5). The highway was part of the Lewis River Road, signed as State Road 15, from 1909 until 1919. The current route of SR 503 was split between Secondary State Highway 1S (SSH 1) from Woodland to Battle Ground and SSH 1U from Battle Ground to Orchards in 1937, combined to form SR 503 during the 1964 highway renumbering. A spur route, established in 1991, travels northeast into the Gifford Pinchot National Forest along Yale Lake, serving the community of Cougar.