11 bridges with vertical clearance data on SR-18 in Michigan. Lowest: 161.7ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 161.7ft | I-75Bl|M-18|N Rosc | I-75 Nb | 2.0 Mi S Of Roscommon | 1971 | Map |
| 165.0ft | M-18 | Us-10 | @ M-18 | 1962 | Map |
| 1000.0ft | M-18 | Tobacco River | In Beaverton | 1939 | Map |
| 1000.0ft | M-18 | Farm Drain | 3.6 Mi Sw Of Gladwin | 1937 | Map |
| 1000.0ft | M-18|M-61|W Cedar | Cedar Creek | In Gladwin | 2001 | Map |
| 1000.0ft | M-18 | S Br Little Sugar River | 2.2 Mi Se Of Oberlin | 1923 | Map |
| 1000.0ft | M-18 | N Br Cedar River | 1.6 Mi Se Of Skeels | 1923 | Map |
| 1000.0ft | M-18 | Bluff Creek | 0.8 Mi N Of Us-10 | 2001 | Map |
| 1000.0ft | M-18|M-55|W Hought | Denton Creek | 0.5 Mi Ne Of Prudenville | 1959 | Map |
| 1000.0ft | M-18|Lake St | S Br Au Sable River | E Lts Of Roscommon | 1935 | Map |
| 1000.0ft | M-18 | Backus Creek | 9.8 Mi S Of Bus-75 | 2019 | Map |