US 87 over South Willow Creek
Good Condition50 years old1,223 vehicles/day
Location
| State | Montana |
| County | Musselshell |
| Location | 7m N Roundup |
| Carries | US 87 |
| Crosses | South Willow Creek |
| Coordinates | 46.55229, -108.59129 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 89.9 ft (27.4 m) |
| Max Span | 89.9 ft (27.4 m) |
| Deck Width | 46.3 ft (14.1 m) |
| Deck Area | 386.3 sq m |
| Main Spans | 1 |
| Year Built | 1976 |
Traffic
| Avg Daily Traffic | 1,223 (2023) |
| Truck Traffic | 8% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 224 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | P00061008+01631 |