Main ST over Clark Fork River
PoorPowell County, Montana · S Deer Lodge · Structure no. S00275002+04801
- Built
- 1949
- 76 years old
- Condition
- Poor
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 135 ft
- 2 main spans
- Daily traffic
- 2,330
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Main ST over Clark Fork River is a steel continuous stringer/multi-beam or girder carrying Main ST over Clark Fork River in Powell County, Montana. It was built in 1949, so it is 76 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 2,330 vehicles a day, roughly 2% of them trucks, projected to reach 2,447 by 2043. The structure is 135 ft (41.1 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Main ST over Clark Fork River built?
It was built in 1949, making it 76 years old in 2025.
What condition is Main ST over Clark Fork River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.
How much traffic does Main ST over Clark Fork River carry?
About 2,330 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is Main ST over Clark Fork River?
The structure is 135 ft (41.1 m) long with a longest span of 65 ft (19.8 m) and a deck 32 ft wide.
Who owns Main ST over Clark Fork River?
It is owned by the State Highway Agency.