S 446 over RR
FairRosebud County, Montana · 1M W Rosebud · Structure no. S00446001+01391
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 205 ft
- 3 main spans
- Daily traffic
- 257
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 446 over RR is a prestressed concrete stringer/multi-beam or girder carrying S 446 over RR in Rosebud County, Montana. It was built in 1970, so it is 55 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 257 vehicles a day, roughly 3% of them trucks, projected to reach 270 by 2043. The structure is 205 ft (62.5 m) long and 40 ft wide. If it were closed, the detour would be 55.3 mi (89 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 S 446 over RR built?
It was built in 1970, making it 55 years old in 2025.
What condition is S 446 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 S 446 over RR carry?
About 257 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is S 446 over RR?
The structure is 205 ft (62.5 m) long with a longest span of 75 ft (22.9 m) and a deck 40 ft wide.
Who owns S 446 over RR?
It is owned by the State Highway Agency.