I 15 over Boulder River
Fair Condition41 years old3,182 vehicles/day
Location
| State | Montana |
| County | Jefferson |
| Location | 2.5m S Basin |
| Carries | I 15 |
| Crosses | Boulder River |
| Coordinates | 46.26228, -112.28766 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 123.0 ft (37.5 m) |
| Max Span | 51.5 ft (15.7 m) |
| Deck Width | 84.3 ft (25.7 m) |
| Deck Area | 963.8 sq m |
| Main Spans | 3 |
| Year Built | 1985 |
Traffic
| Avg Daily Traffic | 3,182 (2023) |
| Truck Traffic | 16% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | November 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | I00015154+06391 |