I 90 over Sep County Road
Fair Condition45 years old6,090 vehicles/day
Location
| State | Montana |
| County | Sweet Grass |
| Location | 5m W Big Timber |
| Carries | I 90 |
| Crosses | Sep County Road |
| Coordinates | 45.79176, -110.04229 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 5 (Fair) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 79.1 ft (24.1 m) |
| Max Span | 29.9 ft (9.1 m) |
| Deck Width | 44.3 ft (13.5 m) |
| Deck Area | 325.4 sq m |
| Main Spans | 3 |
| Year Built | 1981 |
Traffic
| Avg Daily Traffic | 6,090 (2023) |
| Truck Traffic | 18% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 2 |
Inspection & Ownership
| Last Inspection | 623 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | I00090363+05672 |