IRR - S 39 over RR
FairRosebud County, Montana · 21M NW of Colstrip · Structure no. P00039043+06251
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 215 ft
- 3 main spans
- Daily traffic
- 833
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - S 39 over RR is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 39 over RR in Rosebud County, Montana. It was built in 1983, so it is 42 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 833 vehicles a day, roughly 7% of them trucks, projected to reach 875 by 2043. The structure is 215 ft (65.6 m) long and 42 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - S 39 over RR built?
It was built in 1983, making it 42 years old in 2025.
What condition is IRR - S 39 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 February 2025.
How much traffic does IRR - S 39 over RR carry?
About 833 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is IRR - S 39 over RR?
The structure is 215 ft (65.6 m) long with a longest span of 77 ft (23.5 m) and a deck 42 ft wide.
Who owns IRR - S 39 over RR?
It is owned by the State Highway Agency.