9 bridges with vertical clearance data on I-18 in Puerto Rico. Lowest: 144.7ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 144.7ft | Pr 18 1.00 Km | Pr 23 2.50 Km | At Int Pr 18 And Pr 23 | 1967 | Map |
| 147.6ft | Pr 18 | Ramp From Pr 21 | 0.17 Km South Int Pr 21 | 1965 | Map |
| 148.6ft | Pr 18 2.6 Km | Pr 17 4.0 Km | At Int Pr 18 And Pr 17 | 1967 | Map |
| 150.9ft | Pr 18 Nobd 4.50 Km | Pr 21 1.20 Km | 5.8 Km N E Of Guaynabo | 1965 | Map |
| 155.5ft | Pr 18 | Kalaf Street | North Plaza Las Americas | 1972 | Map |
| 157.5ft | Pr 18 | Domenech Street | At East Bithorn Stadium | 1967 | Map |
| 157.8ft | Pr 18 0.65 Km | Chardon Street | At East Plaza Las America | 1972 | Map |
| 158.1ft | Pr 18 Southbound | Pr 21 | 5.8 Km N E Of Guaynabo | 1965 | Map |
| 165.4ft | Ramp Pr18 To Pr22 | Pr 18 | Pr 18 To Pr 22 Km 0.2 | 1975 | Map |