Washington State Route 501

State Route 501
State Route 501
Erwin O. Rieger Memorial Highway
	The existing highway is highlighted in red. The proposed completion is shown in dashed purple.
Route information
	Auxiliary route of I-5
	Maintained by WSDOT
Length	13.97 mi (22.48 km)
Existed	1964–present
Southern section
Length	11.00 mi (17.70 km)
South end	I-5 in Vancouver
North end	Ridgefield NWR near Vancouver
Northern section
Length	2.97 mi (4.78 km)
West end	Main Street in Ridgefield
East end	I-5 in Ridgefield
Location
Country	United States
State	Washington
Counties	Clark
Highway system
	State highways in Washington; Interstate; US; State; Scenic; Pre-1964; 1964 renumbering; Former;

State Route 501 (SR 501, designated as the Erwin O. Rieger Memorial Highway) is a 13.97-mile-long (22.48 km) state highway in the southern part of the U.S. state of Washington. It is split into two sections in Clark County, a north–south alignment connecting Interstate 5 (I-5) in Vancouver to the Port of Vancouver and the Ridgefield National Wildlife Refuge, and a west–east alignment connecting Ridgefield to I-5. Prior to the 1964 highway renumbering, SR 501 was designated as Secondary State Highway 1T (SSH 1T), established in 1937 and re-aligned to serve the Port of Vancouver in 1963.

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