IRR - S 24 over Alkali Creek
FairValley County, Montana · 10M S Opheim · Structure no. P00031039+08961
- Built
- 1935
- 90 years old, rebuilt 1976
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 77 ft
- 4 main spans
- Daily traffic
- 200
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - S 24 over Alkali Creek is a wood or timber stringer/multi-beam or girder carrying IRR - S 24 over Alkali Creek in Valley County, Montana. It was built in 1935 and reconstructed in 1976, so it is 90 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 200 vehicles a day, roughly 34% of them trucks, projected to reach 210 by 2043. The structure is 77 ft (23.5 m) long and 27 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 IRR - S 24 over Alkali Creek built?
It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1976.
What condition is IRR - S 24 over Alkali 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 IRR - S 24 over Alkali Creek carry?
About 200 vehicles per day (2023 count), of which roughly 34% are trucks.
How long is IRR - S 24 over Alkali Creek?
The structure is 77 ft (23.5 m) long with a longest span of 19 ft (5.8 m) and a deck 27 ft wide.
Who owns IRR - S 24 over Alkali Creek?
It is owned by the State Highway Agency.