Carmichael Road over South Boulder River
FairMadison County, Montana · 9.5M S Jefferson Island · Structure no. 000000000007085
- Built
- 1999
- 26 years old
- Condition
- Fair
- inspected September 2024
- Type
- Slab
- Concrete
- Length
- 27 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Carmichael Road over South Boulder River is a concrete slab carrying Carmichael Road over South Boulder River in Madison County, Montana. It was built in 1999, so it is 26 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 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 27 ft (8.1 m) long and 27 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Carmichael Road over South Boulder River built?
It was built in 1999, making it 26 years old in 2025.
What condition is Carmichael Road over South Boulder 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 September 2024.
How much traffic does Carmichael Road over South Boulder River carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Carmichael Road over South Boulder River?
The structure is 27 ft (8.1 m) long with a longest span of 25 ft (7.6 m) and a deck 27 ft wide.
Who owns Carmichael Road over South Boulder River?
It is owned by the County Highway Agency.