US 12 over Little Blackfoot River
FairPowell County, Montana · 1M W Avon · Structure no. P00008011+08791
- Built
- 1982
- 43 years old
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 118 ft
- 2 main spans
- Daily traffic
- 3,217
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 over Little Blackfoot River is a prestressed concrete stringer/multi-beam or girder carrying US 12 over Little Blackfoot River in Powell County, Montana. It was built in 1982, so it is 43 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 3,217 vehicles a day, roughly 8% of them trucks, projected to reach 3,394 by 2043. The structure is 118 ft (36 m) long and 46 ft wide. If it were closed, the detour would be 69 mi (111 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 12 over Little Blackfoot River built?
It was built in 1982, making it 43 years old in 2025.
What condition is US 12 over Little Blackfoot River 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 November 2023.
How much traffic does US 12 over Little Blackfoot River carry?
About 3,217 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is US 12 over Little Blackfoot River?
The structure is 118 ft (36 m) long with a longest span of 70 ft (21.3 m) and a deck 46 ft wide.
Who owns US 12 over Little Blackfoot River?
It is owned by the State Highway Agency.