Brooks St-Us 12 over Bitterroot River
FairMissoula County, Montana · Missoula-Brooks ST · Structure no. P00007090+01161
- Built
- 1968
- 57 years old, rebuilt 1995
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 347 ft
- 4 main spans
- Daily traffic
- 28,185
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Brooks St-Us 12 over Bitterroot River is a prestressed concrete stringer/multi-beam or girder carrying Brooks St-Us 12 over Bitterroot River in Missoula County, Montana. It was built in 1968 and reconstructed in 1995, so it is 57 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 28,185 vehicles a day, roughly 2% of them trucks, projected to reach 29,594 by 2043. The structure is 347 ft (105.7 m) long and 86 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| 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 Brooks St-Us 12 over Bitterroot River built?
It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1995.
What condition is Brooks St-Us 12 over Bitterroot 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 June 2024.
How much traffic does Brooks St-Us 12 over Bitterroot River carry?
About 28,185 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is Brooks St-Us 12 over Bitterroot River?
The structure is 347 ft (105.7 m) long with a longest span of 87 ft (26.5 m) and a deck 86 ft wide.
Who owns Brooks St-Us 12 over Bitterroot River?
It is owned by the State Highway Agency.