IRR - S 451 over Little Bighorn River
Fair Condition71 years old915 vehicles/day
Location
| State | Montana |
| County | Big Horn |
| Location | 8m S Garryowen Int |
| Carries | IRR - S 451 |
| Crosses | Little Bighorn River |
| Coordinates | 45.41020, -107.39226 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Tee Beam |
| Total Length | 136.2 ft (41.5 m) |
| Max Span | 54.1 ft (16.5 m) |
| Deck Width | 33.1 ft (10.1 m) |
| Deck Area | 419.1 sq m |
| Main Spans | 4 |
| Year Built | 1955 |
Traffic
| Avg Daily Traffic | 915 (2023) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 524 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | S00451008+06371 |