I 90 over Clark Fork River
PoorMineral County, Montana · 3.7M W Superior · Structure no. I00090042+09192
- Built
- 1984
- 41 years old
- Condition
- Poor
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 1,092 ft
- 6 main spans
- Daily traffic
- 3,719
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 90 over Clark Fork River is a steel continuous stringer/multi-beam or girder carrying I 90 over Clark Fork River in Mineral County, Montana. It was built in 1984, so it is 41 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 3,719 vehicles a day, roughly 27% of them trucks, projected to reach 3,904 by 2043. The structure is 1,092 ft (332.8 m) long and 44 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 90 over Clark Fork River built?
It was built in 1984, making it 41 years old in 2025.
What condition is I 90 over Clark Fork River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.
How much traffic does I 90 over Clark Fork River carry?
About 3,719 vehicles per day (2023 count), of which roughly 27% are trucks.
How long is I 90 over Clark Fork River?
The structure is 1,092 ft (332.8 m) long with a longest span of 198 ft (60.3 m) and a deck 44 ft wide.
Who owns I 90 over Clark Fork River?
It is owned by the State Highway Agency.