IRR BIA RTE 91 over Big Horn River
Fair Condition56 years old360 vehicles/day
Location
| State | Montana |
| County | Big Horn |
| Location | 2.4 Km West Of St. Xavier |
| Carries | IRR BIA RTE 91 |
| Crosses | Big Horn River |
| Coordinates | 45.46399, -107.74890 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 524.9 ft (160 m) |
| Max Span | 105.0 ft (32 m) |
| Deck Width | 34.1 ft (10.4 m) |
| Deck Area | 1,664 sq m |
| Main Spans | 5 |
| Year Built | 1970 |
Traffic
| Avg Daily Traffic | 360 (2024) |
| Truck Traffic | 20% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 624 |
| Inspection Frequency | Every 24 months |
| Owner | Bureau of Indian Affairs |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 00000000000C208 |