IRR - I 90 over Bighorn River
Fair Condition55 years old4,258 vehicles/day
Location
| State | Montana |
| County | Big Horn |
| Location | Hardin |
| Carries | IRR - I 90 |
| Crosses | Bighorn River |
| Coordinates | 45.73697, -107.57331 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel Continuous |
| Design | Stringer/Multi-beam |
| Total Length | 593.5 ft (180.9 m) |
| Max Span | 195.9 ft (59.7 m) |
| Deck Width | 44.3 ft (13.5 m) |
| Deck Area | 2442.2 sq m |
| Main Spans | 3 |
| Year Built | 1971 |
Traffic
| Avg Daily Traffic | 4,258 (2023) |
| Truck Traffic | 18% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 723 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | I00090498+01012 |