I 90 over Int Henderson
FairMineral County, Montana · 3.1M E De Borgia · Structure no. I00090022+00131
- Built
- 1980
- 45 years old, rebuilt 2007
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 138 ft
- 3 main spans
- Daily traffic
- 7,448
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Int Henderson is a prestressed concrete stringer/multi-beam or girder carrying I 90 over Int Henderson in Mineral County, Montana. It was built in 1980 and reconstructed in 2007, so it is 45 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 5 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 7,448 vehicles a day, roughly 26% of them trucks, projected to reach 7,820 by 2043. The structure is 138 ft (42.1 m) long and 91 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Int Henderson built?
It was built in 1980, making it 45 years old in 2025. It was reconstructed in 2007.
What condition is I 90 over Int Henderson 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 2023.
How much traffic does I 90 over Int Henderson carry?
About 7,448 vehicles per day (2023 count), of which roughly 26% are trucks.
How long is I 90 over Int Henderson?
The structure is 138 ft (42.1 m) long with a longest span of 56 ft (17.1 m) and a deck 91 ft wide.
Who owns I 90 over Int Henderson?
It is owned by the State Highway Agency.