US 12 over RR
FairRosebud County, Montana · SW Edge Forsyth · Structure no. P00014270+05031
- Built
- 1977
- 48 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 235 ft
- 3 main spans
- Daily traffic
- 1,249
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 over RR is a prestressed concrete stringer/multi-beam or girder carrying US 12 over RR in Rosebud County, Montana. It was built in 1977, so it is 48 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 1,249 vehicles a day, roughly 4% of them trucks, projected to reach 1,311 by 2043. The structure is 235 ft (71.5 m) long and 46 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 12 over RR built?
It was built in 1977, making it 48 years old in 2025.
What condition is US 12 over RR in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in September 2024.
How much traffic does US 12 over RR carry?
About 1,249 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is US 12 over RR?
The structure is 235 ft (71.5 m) long with a longest span of 107 ft (32.5 m) and a deck 46 ft wide.
Who owns US 12 over RR?
It is owned by the State Highway Agency.