Acorn Flats RD over Big Porcupine CR 005
Good Condition19 years old100 vehicles/day
Location
| State | Montana |
| County | Rosebud |
| Location | 13m NE Ingomar |
| Carries | Acorn Flats RD |
| Crosses | Big Porcupine CR 005 |
| Coordinates | 46.69222, -107.21083 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Tee Beam |
| Total Length | 48.9 ft (14.9 m) |
| Max Span | 47.9 ft (14.6 m) |
| Deck Width | 26.2 ft (8 m) |
| Deck Area | 119.2 sq m |
| Main Spans | 1 |
| Year Built | 2007 |
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 | L44105013+06001 |