I 90 over RR
FairBig Horn County, Montana · 14.9M W Hardin · Structure no. I00090480+08972
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 184 ft
- 3 main spans
- Daily traffic
- 3,736
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over RR is a prestressed concrete stringer/multi-beam or girder carrying I 90 over RR in Big Horn County, Montana. It was built in 1972, so it is 53 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 3,736 vehicles a day, roughly 23% of them trucks, projected to reach 3,923 by 2043. The structure is 184 ft (56.1 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over RR built?
It was built in 1972, making it 53 years old in 2025.
What condition is I 90 over RR 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 April 2023.
How much traffic does I 90 over RR carry?
About 3,736 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is I 90 over RR?
The structure is 184 ft (56.1 m) long with a longest span of 72 ft (21.9 m) and a deck 44 ft wide.
Who owns I 90 over RR?
It is owned by the State Highway Agency.