I 15 over Sep Old US 91
Good Condition48 years old2,218 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | 3m S Cascade |
| Carries | I 15 |
| Crosses | Sep Old US 91 |
| Coordinates | 47.23083, -111.75647 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Scour Critical | Not applicable |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 99.1 ft (30.2 m) |
| Max Span | 41.3 ft (12.6 m) |
| Deck Width | 44.3 ft (13.5 m) |
| Deck Area | 407.7 sq m |
| Main Spans | 3 |
| Year Built | 1978 |
Traffic
| Avg Daily Traffic | 2,218 (2023) |
| Truck Traffic | 16% |
| Lanes On Bridge | 2 |
| Lanes Under Bridge | 2 |
Inspection & Ownership
| Last Inspection | 624 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | I00015251+06842 |