Old US 91 over Missouri River-rr 069
Poor Condition95 years old316 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | 11m S Cascade |
| Carries | Old US 91 |
| Crosses | Missouri River-rr 069 |
| Coordinates | 47.16701, -111.83439 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 5 (Fair) |
| Superstructure | 4 (Poor) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel |
| Design | Truss - Thru |
| Total Length | 549.9 ft (167.6 m) |
| Max Span | 199.5 ft (60.8 m) |
| Deck Width | 20.7 ft (6.3 m) |
| Deck Area | 1055.9 sq m |
| Main Spans | 3 |
| Year Built | 1931 |
Traffic
| Avg Daily Traffic | 316 (2023) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 724 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is on the National Register of Historic Places |
| Structure Number | L07604006+04001 |