US 191 FH 42 over Swan Creek
FairGallatin County, Montana · 12M NE Big Sky · Structure no. P00050057+02881
- Built
- 2009
- 16 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 58 ft
- 1 main span
- Daily traffic
- 8,952
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 191 FH 42 over Swan Creek is a prestressed concrete stringer/multi-beam or girder carrying US 191 FH 42 over Swan Creek 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 58 ft (17.7 m) long and 53 ft wide. If it were closed, the detour would be 110 mi (177 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 191 FH 42 over Swan Creek built?
It was built in 2009, making it 16 years old in 2025.
What condition is US 191 FH 42 over Swan Creek 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 Swan Creek carry?
About 8,952 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is US 191 FH 42 over Swan Creek?
The structure is 58 ft (17.7 m) long with a longest span of 56 ft (17 m) and a deck 53 ft wide.
Who owns US 191 FH 42 over Swan Creek?
It is owned by the State Highway Agency.