Fdr #100 over Ruby River
GoodMadison County, Montana · Just South of Vigilante G · Structure no. 010206000003029
- Built
- 1999
- 26 years old
- Condition
- Good
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 88 ft
- 1 main span
- Daily traffic
- 50
- Owner
- Federal
- U.S. Forest Service
About this bridge
Fdr #100 over Ruby River is a prestressed concrete stringer/multi-beam or girder carrying Fdr #100 over Ruby 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 50 vehicles a day, projected to reach 75 by 2045. The structure is 88 ft (26.7 m) long and 19 ft wide. If it were closed, the detour would be 620.7 mi (999 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Fdr #100 over Ruby River built?
It was built in 1999, making it 26 years old in 2025.
What condition is Fdr #100 over Ruby River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.
How much traffic does Fdr #100 over Ruby River carry?
About 50 vehicles per day (latest count).
How long is Fdr #100 over Ruby River?
The structure is 88 ft (26.7 m) long with a longest span of 82 ft (25 m) and a deck 19 ft wide.
Who owns Fdr #100 over Ruby River?
It is owned by the U.S. Forest Service.