8 bridges with vertical clearance data on SR-21 in Alabama. Lowest: 220.1ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 220.1ft | Sr 21 | A.G.R | Frisco City | 1938 | Map |
| 232.6ft | Sr21 | Nfsouth Rr/Snow Creek | 0.6 Mi No Jct Us 78 | 1957 | Map |
| 232.6ft | Sr21 | Norfolk Southern R/R | Munford | 2018 | Map |
| 248.0ft | Al 21 | Genetta Ditch | 0.4 Mi W Of I65 | 1955 | Map |
| 248.0ft | Sr 21 | Wolf Creek | 3.7 Mi.N. Of Furman | 1994 | Map |
| 248.0ft | Sr 21 | Branch | Monroeville Bypass | 1994 | Map |
| 251.6ft | Sr21 | Ped./Bicycle- Ladiga | City Of Piedmont | 1959 | Map |
| 265.7ft | Sr21 | Nf South. Rr/Snow Creek | 0.6 Mi No Jct Us 78 | 1957 | Map |