IRR - S 451 over Lodge Grass Creek
FairBig Horn County, Montana · Lodge Grass · Structure no. S00451015+07741
- Built
- 1955
- 70 years old
- Condition
- Fair
- inspected February 2025
- Type
- Tee Beam
- Concrete Continuous
- Length
- 65 ft
- 3 main spans
- Daily traffic
- 539
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - S 451 over Lodge Grass Creek is a concrete continuous tee beam carrying IRR - S 451 over Lodge Grass Creek in Big Horn County, Montana. It was built in 1955, so it is 70 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 539 vehicles a day, roughly 1% of them trucks, projected to reach 566 by 2043. The structure is 65 ft (19.7 m) long and 35 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| 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 - S 451 over Lodge Grass Creek built?
It was built in 1955, making it 70 years old in 2025.
What condition is IRR - S 451 over Lodge Grass 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 February 2025.
How much traffic does IRR - S 451 over Lodge Grass Creek carry?
About 539 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is IRR - S 451 over Lodge Grass Creek?
The structure is 65 ft (19.7 m) long with a longest span of 40 ft (12.2 m) and a deck 35 ft wide.
Who owns IRR - S 451 over Lodge Grass Creek?
It is owned by the State Highway Agency.