S 91 over Int East Big Timber I 90
FairSweet Grass County, Montana · 2M E Big Timber · Structure no. P00091003+00311
- Built
- 1981
- 44 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 323 ft
- 4 main spans
- Daily traffic
- 2,133
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 91 over Int East Big Timber I 90 is a prestressed concrete stringer/multi-beam or girder carrying S 91 over Int East Big Timber I 90 in Sweet Grass County, Montana. It was built in 1981, so it is 44 years old, younger 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 2,133 vehicles a day, roughly 5% of them trucks, projected to reach 2,240 by 2043. The structure is 323 ft (98.4 m) long and 46 ft wide.
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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 91 over Int East Big Timber I 90 built?
It was built in 1981, making it 44 years old in 2025.
What condition is S 91 over Int East Big Timber I 90 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 March 2024.
How much traffic does S 91 over Int East Big Timber I 90 carry?
About 2,133 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is S 91 over Int East Big Timber I 90?
The structure is 323 ft (98.4 m) long with a longest span of 112 ft (34.1 m) and a deck 46 ft wide.
Who owns S 91 over Int East Big Timber I 90?
It is owned by the State Highway Agency.