I 90 over Rattler Gulch
FairGranite County, Montana · 4.1M W Drummond · Structure no. I00090149+03001
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected May 2024
- Type
- Slab
- Concrete
- Length
- 21 ft
- 1 main span
- Daily traffic
- 13,081
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Rattler Gulch is a concrete slab carrying I 90 over Rattler Gulch in Granite County, Montana. It was built in 1971, so it is 54 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 13,081 vehicles a day, roughly 18% of them trucks, projected to reach 13,997 by 2043. The structure is 21 ft (6.4 m) long and 312 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Rattler Gulch built?
It was built in 1971, making it 54 years old in 2025.
What condition is I 90 over Rattler Gulch 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 May 2024.
How much traffic does I 90 over Rattler Gulch carry?
About 13,081 vehicles per day (2023 count), of which roughly 18% are trucks.
How long is I 90 over Rattler Gulch?
The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m) and a deck 312 ft wide.
Who owns I 90 over Rattler Gulch?
It is owned by the State Highway Agency.