US HWY 12 over Musselshell River
GoodRosebud County, Montana · 2M NE Melstone · Structure no. 000000201905483
- Built
- 2019
- 6 years old
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 213 ft
- 3 main spans
- Daily traffic
- 241
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US HWY 12 over Musselshell River is a prestressed concrete stringer/multi-beam or girder carrying US HWY 12 over Musselshell River in Rosebud County, Montana. It was built in 2019, so it is 6 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 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 241 vehicles a day, roughly 13% of them trucks, projected to reach 253 by 2043. The structure is 213 ft (65 m) long and 39 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US HWY 12 over Musselshell River built?
It was built in 2019, making it 6 years old in 2025.
What condition is US HWY 12 over Musselshell 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 October 2023.
How much traffic does US HWY 12 over Musselshell River carry?
About 241 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is US HWY 12 over Musselshell River?
The structure is 213 ft (65 m) long with a longest span of 92 ft (28 m) and a deck 39 ft wide.
Who owns US HWY 12 over Musselshell River?
It is owned by the State Highway Agency.