I 15 SB over Sun River
Fair Condition60 years old5,254 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | Great Falls |
| Carries | I 15 SB |
| Crosses | Sun River |
| Coordinates | 47.49955, -111.34314 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 8 (Very Good) |
| Superstructure | 7 (Good) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 484.9 ft (147.8 m) |
| Max Span | 97.1 ft (29.6 m) |
| Deck Width | 32.2 ft (9.8 m) |
| Deck Area | 1448.4 sq m |
| Main Spans | 5 |
| Year Built | 1966 (reconstructed 1977) |
Traffic
| Avg Daily Traffic | 5,254 (2023) |
| Truck Traffic | 9% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 125 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | I00015279+09762 |