Petroleum RD over Big Porcupine CR
Good Condition4 years old100 vehicles/day
Location
| State | Montana |
| County | Rosebud |
| Location | 14m E Ingomar |
| Carries | Petroleum RD |
| Crosses | Big Porcupine CR |
| Coordinates | 46.58470, -107.09570 |
Condition Ratings
| Overall Condition | Good |
| Deck | 8 (Very Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 53.5 ft (16.3 m) |
| Max Span | 49.9 ft (15.2 m) |
| Deck Width | 31.5 ft (9.6 m) |
| Deck Area | 156.5 sq m |
| Main Spans | 1 |
| Year Built | 2022 |
Traffic
| Avg Daily Traffic | 100 (2025) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 924 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000202204275 |