MP: 8.01 Location: NE 10th Ave and W Main St, Battle Ground Reassurance shield after the SR 502 junction   MP: 6.2 Location: NE 122nd Ave and NE 129th St, Brush Prairie Turn left to head down 503 Business through Brush Prairie. This is an older alignment of SR 503 and like most business loops … Continue reading State Route 503, SR 502 to SR 500