 From 1964 until 1991, SR 530 began at an interchange with I-5 in Conway and traveled southeast to I-5 again at the current western terminus and then followed the current route.The former routing, now called the Pioneer Highway, followed the Seattle–Vancouver, BC route of the Great Northern Railway served by the International from Conway to Silvana.The former route began at a diamond interchange with I-5 in Conway, which was also the western terminus of .