IRR - US 89 over Birch Creek
FairPondera County, Montana · 14M W Valier · Structure no. P00003085+04811
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 214 ft
- 3 main spans
- Daily traffic
- 1,012
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - US 89 over Birch Creek is a prestressed concrete stringer/multi-beam or girder carrying IRR - US 89 over Birch Creek in Pondera County, Montana. It was built in 1965, so it is 60 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 1,012 vehicles a day, roughly 5% of them trucks, projected to reach 1,063 by 2043. The structure is 214 ft (65.2 m) long and 36 ft wide. If it were closed, the detour would be 72.7 mi (117 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - US 89 over Birch Creek built?
It was built in 1965, making it 60 years old in 2025.
What condition is IRR - US 89 over Birch 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 December 2024.
How much traffic does IRR - US 89 over Birch Creek carry?
About 1,012 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is IRR - US 89 over Birch Creek?
The structure is 214 ft (65.2 m) long with a longest span of 71 ft (21.6 m) and a deck 36 ft wide.
Who owns IRR - US 89 over Birch Creek?
It is owned by the State Highway Agency.