S 72 over Clarks Fork Yellowstone
GoodCarbon County, Montana · 5M S Belfry · Structure no. P00072005+03821
- Built
- 1970
- 55 years old
- Condition
- Good
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 261 ft
- 3 main spans
- Daily traffic
- 1,507
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 72 over Clarks Fork Yellowstone is a prestressed concrete stringer/multi-beam or girder carrying S 72 over Clarks Fork Yellowstone in Carbon County, Montana. It was built in 1970, so it is 55 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 1,507 vehicles a day, roughly 10% of them trucks, projected to reach 1,582 by 2043. The structure is 261 ft (79.5 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| 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 S 72 over Clarks Fork Yellowstone built?
It was built in 1970, making it 55 years old in 2025.
What condition is S 72 over Clarks Fork Yellowstone 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 October 2024.
How much traffic does S 72 over Clarks Fork Yellowstone carry?
About 1,507 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is S 72 over Clarks Fork Yellowstone?
The structure is 261 ft (79.5 m) long with a longest span of 87 ft (26.5 m) and a deck 40 ft wide.
Who owns S 72 over Clarks Fork Yellowstone?
It is owned by the State Highway Agency.