Old US HWY 91 over Muddy Creek Slough 111
Fair Condition103 years old100 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | Ulm |
| Carries | Old US HWY 91 |
| Crosses | Muddy Creek Slough 111 |
| Coordinates | 47.42282, -111.51900 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 5 (Fair) |
| Superstructure | 5 (Fair) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 34.1 ft (10.4 m) |
| Max Span | 33.1 ft (10.1 m) |
| Deck Width | 21.3 ft (6.5 m) |
| Deck Area | 67.6 sq m |
| Main Spans | 1 |
| 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 | L07603000+09001 |