9 bridges with vertical clearance data on SR-18 in California. Lowest: 147.6ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 147.6ft | State Route 18 | Waterman Canyon Rd | 08-Sbd-018-R13.29 | 1969 | Map |
| 148.3ft | State Route 18 | State Route 330 | 08-Sbd-018-31.64 | 1951 | Map |
| 149.9ft | State Route 18 | E138-S18 Connector Ramp | 08-Sbd-018-R17.76 | 1965 | Map |
| 154.9ft | State Route 18 | State Route 210 | 08-Sbd-018-T6.16-Sbd | 1968 | Map |
| 164.0ft | State Route 18 | Interstate 15 | 08-Sbd-018-R96.60-Vctv | 1975 | Map |
| 180.1ft | State Route 18 | Hillside | 08-Sbd-018-R17.54 | 1965 | Map |
| 210.0ft | State Route 18 | Big Bear Creek | 08-Sbd-018-44.32 | 2011 | Map |
| 233.3ft | State Route 18 | Up Rr | 07-La-018-0.19 | 1967 | Map |
| 249.0ft | State Route 18 | Bnsf Ry,Up,Amtrak,Mojave | 08-Sbd-018-95.35 | 1962 | Map |