12 bridges with vertical clearance data on SR-18 in Pennsylvania. Lowest: 141.7ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 141.7ft | Frankfort Rd | Sr 18 Nb O/ 8041 Ramp A | Sr 18 Nb O/ 8041 Ramp A | 1957 | Map |
| 145.7ft | Sr 18 (7Th Ave) | Nsrc, Csx, Beaver Riv | 0.2 Mi Nw Of 5Th Ave | 1987 | Map |
| 149.0ft | Frankfort Road | Raccoon Creek | Potter Twp | 1932 | Map |
| 158.1ft | Sr 18 (7Th Ave) Nb | Nsrc, Csx, Beaver River | 0.2 Mi Nw Of 5Th Ave | 1986 | Map |
| 169.9ft | Sr 18, Albion Rd | Sr 90, Eb/Wb | Girard Township | 2022 | Map |
| 185.0ft | Sr 0018 | Sr 0022 | Hanover Township | 1970 | Map |
| 211.6ft | Sr 18,Rice Ave | Over Norfolk & Western | Girard Borough | 1938 | Map |
| 220.1ft | Sr 18 | Over Ns R R/Siding | Pymatuning Township | 1971 | Map |
| 234.9ft | Mahoning Ave | Shenango R, Nci Rr | Mahoning Ave. Viaduct | 1923 | Map |
| 250.0ft | Big Beaver Blvd | Service Rd, Wallace Run | 0.1 Mi N Of Sr 551 | 1951 | Map |
| 254.3ft | Sr 18,Main Street | Over B&Le R.R.& Run | Platea Borough | 1936 | Map |
| 282.5ft | Rochester Monaca | Sr 65,Rr,Local,Ohio Riv. | Rochester Monaca Bridge | 1986 | Map |