MP: 6.01 Location: NE 117th Ave and NE Fourth Plain Blvd Both routes are signed here even though SR 503 probably doesn’t need to be, especially since the mileposts have been switched over to SR 500 on this stretch   MP: 6.89 Location: NE 117th Ave and Padden Pkwy NE, Vancouver SR 500 will turn … Continue reading State Route 500, SR 503 to SR 503