US 89 over Flathead Creek
FairPark County, Montana · 1M N Wilsall · Structure no. P00059024+06971
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 240 ft
- 3 main spans
- Daily traffic
- 1,140
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 89 over Flathead Creek is a prestressed concrete stringer/multi-beam or girder carrying US 89 over Flathead Creek in Park County, Montana. It was built in 1973, so it is 52 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 1,140 vehicles a day, roughly 4% of them trucks, projected to reach 1,197 by 2043. The structure is 240 ft (73.1 m) long and 43 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 89 over Flathead Creek built?
It was built in 1973, making it 52 years old in 2025.
What condition is US 89 over Flathead Creek 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 August 2024.
How much traffic does US 89 over Flathead Creek carry?
About 1,140 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is US 89 over Flathead Creek?
The structure is 240 ft (73.1 m) long with a longest span of 85 ft (25.9 m) and a deck 43 ft wide.
Who owns US 89 over Flathead Creek?
It is owned by the State Highway Agency.