 The $35 million project was dedicated on September 30, 2000, and incorporated into SR 501.The section of the highway between the Ridgefield National Wildlife Refuge and the city of Ridgefield has never been constructed and remains as a physical gap in the state highway system.The interchange between I-5 and SR 501 east of Ridgefield was rebuilt by WSDOT between 2010 and 2012, adding roundabouts at intersections west and east of the interchange as well.