9 bridges with vertical clearance data on US-12 in Montana. Lowest: 117.1ft.
| Clearance | Carries | Crosses | Location | Built | Map |
|---|---|---|---|---|---|
| 117.1ft | Lyndale Ave-Us 12 | Great Northern Area | Helena-Lyndale Ave | 2003 | Map |
| 166.3ft | Prospect Ave-Us 12 | Int Capitol-I 15 | Helena-Prospect Ave | 1961 | Map |
| 171.6ft | Us 12 | Int West Forsyth I 94 | Sw Edge Forsyth | 1977 | Map |
| 184.1ft | Prospect Ave-Us 12 | Int Capitol-I 15 | Helena-Prospect Ave | 1961 | Map |
| 228.3ft | Us 12 | Rr | Sw Edge Forsyth | 1977 | Map |
| 239.8ft | Us 12 | Rr | 2M Se Baker | 1968 | Map |
| 253.3ft | Third St Ne | Abandoned Rr-Antelope Cr | Harlowton-Third St Ne | 1939 | Map |
| 254.9ft | Us 12 | Rr | 3M E Helena | 1978 | Map |
| 270.0ft | Us 12 | Little Blackfoot Riv-Rr | 5M E Garrison | 2009 | Map |