I 90 over Int Mossmain Road-P 4
FairYellowstone County, Montana · 3.1M E Laurel · Structure no. I00090437+04791
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 120 ft
- 3 main spans
- Daily traffic
- 12,397
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Int Mossmain Road-P 4 is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int Mossmain Road-P 4 in Yellowstone County, Montana. It was built in 1964, so it is 61 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 12,397 vehicles a day, roughly 10% of them trucks, projected to reach 13,016 by 2043. The structure is 120 ft (36.6 m) long and 41 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Int Mossmain Road-P 4 built?
It was built in 1964, making it 61 years old in 2025.
What condition is I 90 over Int Mossmain Road-P 4 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 October 2023.
How much traffic does I 90 over Int Mossmain Road-P 4 carry?
About 12,397 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is I 90 over Int Mossmain Road-P 4?
The structure is 120 ft (36.6 m) long with a longest span of 47 ft (14.3 m) and a deck 41 ft wide.
Who owns I 90 over Int Mossmain Road-P 4?
It is owned by the State Highway Agency.