I 94 over Tongue River
FairCuster County, Montana · 1M S Miles City · Structure no. I00094137+04602
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 294 ft
- 3 main spans
- Daily traffic
- 2,354
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 94 over Tongue River is a steel continuous stringer/multi-beam or girder carrying I 94 over Tongue River in Custer County, Montana. It was built in 1974, so it is 51 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 2,354 vehicles a day, roughly 23% of them trucks, projected to reach 2,471 by 2043. The structure is 294 ft (89.6 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 94 over Tongue River built?
It was built in 1974, making it 51 years old in 2025.
What condition is I 94 over Tongue 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 I 94 over Tongue River carry?
About 2,354 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is I 94 over Tongue River?
The structure is 294 ft (89.6 m) long with a longest span of 112 ft (34.1 m) and a deck 44 ft wide.
Who owns I 94 over Tongue River?
It is owned by the State Highway Agency.