When first posted in January 1964, SR 103 started at Jct US 101 in Seaview and headed north via Long Beach to Ocean Park. In April 1992, SR 103 was extended north to Leadbetter Point State Park. SR 103 is now 19.97 miles long.
Before 1964, SR 103 from Seaview to Ocean Park was SSH 12A.
Primary State Hwys Secondary State Hwys