S 300 over Musselshell River
FairGolden Valley County, Montana · Ryegate · Structure no. S00300000+02001
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 141 ft
- 2 main spans
- Daily traffic
- 172
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 300 over Musselshell River is a prestressed concrete stringer/multi-beam or girder carrying S 300 over Musselshell River in Golden Valley County, Montana. It was built in 1962, so it is 63 years old, older 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 172 vehicles a day, roughly 11% of them trucks, projected to reach 181 by 2043. The structure is 141 ft (43.1 m) long and 27 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 300 over Musselshell River built?
It was built in 1962, making it 63 years old in 2025.
What condition is S 300 over Musselshell 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 September 2024.
How much traffic does S 300 over Musselshell River carry?
About 172 vehicles per day (2023 count), of which roughly 11% are trucks.
How long is S 300 over Musselshell River?
The structure is 141 ft (43.1 m) long with a longest span of 71 ft (21.6 m) and a deck 27 ft wide.
Who owns S 300 over Musselshell River?
It is owned by the State Highway Agency.