US 310 over RR
FairYellowstone County, Montana · 1M S Laurel · Structure no. P00004052+06201
- Built
- 2014
- 11 years old
- Condition
- Fair
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 380 ft
- 3 main spans
- Daily traffic
- 12,394
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 310 over RR is a steel continuous stringer/multi-beam or girder carrying US 310 over RR in Yellowstone County, Montana. It was built in 2014, so it is 11 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 12,394 vehicles a day, roughly 4% of them trucks, projected to reach 13,447 by 2043. The structure is 380 ft (115.8 m) long and 44 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 2014, making it 11 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 July 2023.
How much traffic does US 310 over RR carry?
About 12,394 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is US 310 over RR?
The structure is 380 ft (115.8 m) long with a longest span of 138 ft (42.2 m) and a deck 44 ft wide.
Who owns US 310 over RR?
It is owned by the State Highway Agency.