US 310 over RR
FairCarbon County, Montana · 16M SE Bridger · Structure no. P00004012+00631
- Built
- 2001
- 24 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 243 ft
- 3 main spans
- Daily traffic
- 1,504
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 310 over RR is a steel stringer/multi-beam or girder carrying US 310 over RR in Carbon County, Montana. It was built in 2001, so it is 24 years old, younger 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 1,504 vehicles a day, roughly 17% of them trucks, projected to reach 1,579 by 2043. The structure is 243 ft (74 m) long and 39 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 310 over RR built?
It was built in 2001, making it 24 years old in 2025.
What condition is US 310 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 May 2024.
How much traffic does US 310 over RR carry?
About 1,504 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is US 310 over RR?
The structure is 243 ft (74 m) long with a longest span of 95 ft (29 m) and a deck 39 ft wide.
Who owns US 310 over RR?
It is owned by the State Highway Agency.