US 12 over Big Porcupine Creek
Good Condition22 years old214 vehicles/day
Location
| State | Montana |
| County | Rosebud |
| Location | 13m NW Forsyth |
| Carries | US 12 |
| Crosses | Big Porcupine Creek |
| Coordinates | 46.36871, -106.90973 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 143.0 ft (43.6 m) |
| Max Span | 47.6 ft (14.5 m) |
| Deck Width | 33.8 ft (10.3 m) |
| Deck Area | 449.1 sq m |
| Main Spans | 3 |
| Year Built | 2004 |
Traffic
| Avg Daily Traffic | 214 (2023) |
| Truck Traffic | 15% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 824 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | P00014257+02111 |