IRR BIA RTE 91 over Rotten Grass Creek
Fair Condition56 years old350 vehicles/day
Location
| State | Montana |
| County | Big Horn |
| Location | 0.8 Km SW Of St. Xavier |
| Carries | IRR BIA RTE 91 |
| Crosses | Rotten Grass Creek |
| Coordinates | 45.46122, -107.72853 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 67.3 ft (20.5 m) |
| Max Span | 65.0 ft (19.8 m) |
| Deck Width | 34.4 ft (10.5 m) |
| Deck Area | 215.2 sq m |
| Main Spans | 1 |
| Year Built | 1970 |
Traffic
| Avg Daily Traffic | 350 (2024) |
| Truck Traffic | 15% |
| 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 | 00000000000C207 |