F Bridge RD over Marias River
FairToole County, Montana · 12M SE Shelby · Structure no. S00417007+01001
- Built
- 1953
- 72 years old, rebuilt 2024
- Condition
- Fair
- inspected October 2023
- Type
- Girder and Floorbeam System
- Steel Continuous
- Length
- 455 ft
- 4 main spans
- Daily traffic
- 55
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
F Bridge RD over Marias River is a steel continuous girder and floorbeam system carrying F Bridge RD over Marias River in Toole County, Montana. It was built in 1953 and reconstructed in 2024, so it is 72 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 55 vehicles a day, roughly 18% of them trucks, projected to reach 58 by 2043. The structure is 455 ft (138.7 m) long and 27 ft wide. If it were closed, the detour would be 36 mi (58 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was F Bridge RD over Marias River built?
It was built in 1953, making it 72 years old in 2025. It was reconstructed in 2024.
What condition is F Bridge RD over Marias River 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 October 2023.
How much traffic does F Bridge RD over Marias River carry?
About 55 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is F Bridge RD over Marias River?
The structure is 455 ft (138.7 m) long with a longest span of 125 ft (38.1 m) and a deck 27 ft wide.
Who owns F Bridge RD over Marias River?
It is owned by the State Highway Agency.