S 484 FH 51 over Otter Creek
FairPowder River County, Montana · 7M SE Ashland · Structure no. S00484003+04001
- Built
- 1963
- 62 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 103 ft
- 2 main spans
- Daily traffic
- 85
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 484 FH 51 over Otter Creek is a prestressed concrete stringer/multi-beam or girder carrying S 484 FH 51 over Otter Creek in Powder River County, Montana. It was built in 1963, so it is 62 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 85 vehicles a day, roughly 2% of them trucks, projected to reach 89 by 2043. The structure is 103 ft (31.3 m) long and 31 ft wide. If it were closed, the detour would be 34.8 mi (56 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. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 484 FH 51 over Otter Creek built?
It was built in 1963, making it 62 years old in 2025.
What condition is S 484 FH 51 over Otter Creek 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 2023.
How much traffic does S 484 FH 51 over Otter Creek carry?
About 85 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is S 484 FH 51 over Otter Creek?
The structure is 103 ft (31.3 m) long with a longest span of 51 ft (15.5 m) and a deck 31 ft wide.
Who owns S 484 FH 51 over Otter Creek?
It is owned by the State Highway Agency.