RD 386 over ST Regis River
FairMineral County, Montana · Big CR RD 386 · Structure no. 011607000000079
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 123 ft
- 2 main spans
- Daily traffic
- 50
- Owner
- Federal
- U.S. Forest Service
About this bridge
RD 386 over ST Regis River is a prestressed concrete stringer/multi-beam or girder carrying RD 386 over ST Regis River in Mineral County, Montana. It was built in 1972, so it is 53 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 123 ft (37.5 m) long and 21 ft wide. If it were closed, the detour would be 98.2 mi (158 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 | 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 RD 386 over ST Regis River built?
It was built in 1972, making it 53 years old in 2025.
What condition is RD 386 over ST Regis 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 July 2023.
How much traffic does RD 386 over ST Regis River carry?
About 50 vehicles per day (latest count).
How long is RD 386 over ST Regis River?
The structure is 123 ft (37.5 m) long with a longest span of 61 ft (18.6 m) and a deck 21 ft wide.
Who owns RD 386 over ST Regis River?
It is owned by the U.S. Forest Service.