Frontage Road 146 over Clark Fork River 034
FairDeer Lodge County, Montana · 4M S Warm Springs · Structure no. L12146001+01001
- Built
- 1931
- 94 years old, rebuilt 1941
- Condition
- Fair
- inspected January 2024
- Type
- Tee Beam
- Concrete
- Length
- 75 ft
- 2 main spans
- Daily traffic
- 100
- 2025 count
- Owner
- State
- State Highway Agency
About this bridge
Frontage Road 146 over Clark Fork River 034 is a concrete tee beam carrying Frontage Road 146 over Clark Fork River 034 in Deer Lodge County, Montana. It was built in 1931 and reconstructed in 1941, so it is 94 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 5 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 75 ft (22.9 m) long and 39 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Frontage Road 146 over Clark Fork River 034 built?
It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1941.
What condition is Frontage Road 146 over Clark Fork River 034 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 January 2024.
How much traffic does Frontage Road 146 over Clark Fork River 034 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Frontage Road 146 over Clark Fork River 034?
The structure is 75 ft (22.9 m) long with a longest span of 37 ft (11.4 m) and a deck 39 ft wide.
Who owns Frontage Road 146 over Clark Fork River 034?
It is owned by the State Highway Agency.