Tammany LN over Bitterroot Canal 046
FairRavalli County, Montana · 4M SE Hamilton · Structure no. L41500002+01001
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected October 2024
- Type
- Channel Beam
- Concrete
- Length
- 58 ft
- 2 main spans
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Tammany LN over Bitterroot Canal 046 is a concrete channel beam carrying Tammany LN over Bitterroot Canal 046 in Ravalli County, Montana. It was built in 1988, so it is 37 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 58 ft (17.7 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Tammany LN over Bitterroot Canal 046 built?
It was built in 1988, making it 37 years old in 2025.
What condition is Tammany LN over Bitterroot Canal 046 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 October 2024.
How much traffic does Tammany LN over Bitterroot Canal 046 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Tammany LN over Bitterroot Canal 046?
The structure is 58 ft (17.7 m) long with a longest span of 28 ft (8.5 m) and a deck 30 ft wide.
Who owns Tammany LN over Bitterroot Canal 046?
It is owned by the County Highway Agency.