Old US HWY 91 over Little Muddy Creek 090
Poor Condition103 years old100 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | 6m N Cascade |
| Carries | Old US HWY 91 |
| Crosses | Little Muddy Creek 090 |
| Coordinates | 47.34093, -111.60911 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 4 (Poor) |
| Substructure | 4 (Poor) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 77.1 ft (23.5 m) |
| Max Span | 24.9 ft (7.6 m) |
| Deck Width | 21.0 ft (6.4 m) |
| Deck Area | 150.4 sq m |
| Main Spans | 3 |
| Year Built | 1923 |
Traffic
| Avg Daily Traffic | 100 (2025) |
| Truck Traffic | 3% |
| 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 | L07603008+01001 |