| State Route 503 | ||||
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| Route information | ||||
| Auxiliary route of I-5 | ||||
| Defined by RCW 47.17.650 | ||||
| Maintained by WSDOT | ||||
| Length: | 54.11 mi[1] (87.08 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| South end: | SR 500 in Orchards | |||
| SR 502 in Battle Ground SR 503 Spur near Yale |
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| North end: | I-5 in Woodland | |||
| Highway system | ||||
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State highways in Washington
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State Route 503, also known as the St. Helens South Roadway, is a state route through the state of Washington. It has a spur route, State Route 503 Spur. It has a Southern terminus at State Route 500 and a Northern terminus at Interstate 5.
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SR 503 starts at an exit and goes south until it reaches the NW Pacific Hwy. and turns NE on Lewis River Road. Then, SR 503 splits into a main highway and a spur; the main highway goes south on Yale Bridge Rd. Lewis River Road continues as State Route 503 Spur to Mount Saint Helens. Yale Bridge Rd. going south turns west onto NE 419th St. Next, SR 503 goes south on NE Gerber-Mckee Road and then turns southwest on NE Chelatchie Road. Then, SR 503 turns south on NE 216th Avenue, and then turning west at NE Fargher Lake Hwy. Next, 503 heads south on NE Lewisville Hwy that changes into SW 10th Ave. It ends at the State Route 500 intersection.
| County | Location | Mile[1] | Destinations | Notes |
|---|---|---|---|---|
| Clark | Orchards | 0.00 | SR 500 to I-205 – Vancouver, Camas | Southern terminus |
| Battle Ground | 7.87 | SR 502 west to I-5 – Vancouver | ||
| Cowlitz | 31.04 | SR 503 Spur east to Mount St. Helens National Volcanic Monument |
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| Woodland | 54.11 | I-5 – Tacoma, Seattle, Bellingham | Northern terminus |
State Route 503 Spur |
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| Location: | Mount St. Helens |
| Length: | 8.42 mi (13.55 km) |
State Route 503 Spur, abbreviated SR 503 Spur, is a small state highway spur route in the U.S. state of Washington, connecting to Mount St. Helens. It has a western terminus at Yale Bridge Road (SR 503) and an eastern terminus at the Mount St. Helens National Monument border. SR 503 Spur continues as Forest Road 90 as it crosses into Skamania County. It is called Lewis River Road all the way. The spur route is 8.42 miles (13.55 km) long.[1]
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