US 191 FH 42 over West Fork Gallatin River
FairGallatin County, Montana · 2M E Big Sky · Structure no. P00050047+09981
- Built
- 2009
- 16 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 97 ft
- 1 main span
- Daily traffic
- 8,952
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 191 FH 42 over West Fork Gallatin River is a prestressed concrete stringer/multi-beam or girder carrying US 191 FH 42 over West Fork Gallatin River in Gallatin County, Montana. It was built in 2009, so it is 16 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 6 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 8,952 vehicles a day, roughly 5% of them trucks, projected to reach 10,519 by 2043. The structure is 97 ft (29.7 m) long and 78 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 191 FH 42 over West Fork Gallatin River built?
It was built in 2009, making it 16 years old in 2025.
What condition is US 191 FH 42 over West Fork Gallatin 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 June 2023.
How much traffic does US 191 FH 42 over West Fork Gallatin River carry?
About 8,952 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is US 191 FH 42 over West Fork Gallatin River?
The structure is 97 ft (29.7 m) long with a longest span of 95 ft (29 m) and a deck 78 ft wide.
Who owns US 191 FH 42 over West Fork Gallatin River?
It is owned by the State Highway Agency.