6th ST SW over Sun River
Fair Condition46 years old13,800 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | Great Falls-6th ST SW |
| Carries | 6th ST SW |
| Crosses | Sun River |
| Coordinates | 47.49194, -111.32837 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 5 (Fair) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 505.9 ft (154.2 m) |
| Max Span | 127.0 ft (38.7 m) |
| Deck Width | 108.9 ft (33.2 m) |
| Deck Area | 5119.4 sq m |
| Main Spans | 4 |
| Year Built | 1980 |
Traffic
| Avg Daily Traffic | 13,800 (2023) |
| Truck Traffic | 1% |
| Lanes On Bridge | 5 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | U05201000+01031 |