I 90 over Int Lothrop
FairMissoula County, Montana · 2.5M E Alberton · Structure no. I00090077+06412
- Built
- 1963
- 62 years old, rebuilt 2010
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 123 ft
- 3 main spans
- Daily traffic
- 4,584
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Int Lothrop is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int Lothrop in Missoula County, Montana. It was built in 1963 and reconstructed in 2010, so it is 62 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 4,584 vehicles a day, roughly 20% of them trucks, projected to reach 4,813 by 2043. The structure is 123 ft (37.5 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 | 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 Int Lothrop built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 2010.
What condition is I 90 over Int Lothrop 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 2024.
How much traffic does I 90 over Int Lothrop carry?
About 4,584 vehicles per day (2023 count), of which roughly 20% are trucks.
How long is I 90 over Int Lothrop?
The structure is 123 ft (37.5 m) long with a longest span of 40 ft (12.2 m) and a deck 46 ft wide.
Who owns I 90 over Int Lothrop?
It is owned by the State Highway Agency.