| This Imperial County S-33 route marker is posted along southbound Highline Road after the intersection with Harris Road. 06/07/08 |
| Another Imperial County S-33 route marker is posted along southbound Highline Road between Ferguson Road and Norrish Road in the eastern Imperial Valley. 06/07/08 |
| Southbound Imperial County S-33 (Kavanaugh Road) shifts onto Miller Road for the final distance to California 115. 06/07/08 |
| Imperial County S-33 (Miller Road) south reaches its southern terminus at California 115. 06/07/08 |