Acorn Flats RD over Big Porcupine CR 005
GoodRosebud County, Montana · 13M NE Ingomar · Structure no. L44105013+06001
- Built
- 2007
- 18 years old
- Condition
- Good
- inspected September 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 49 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Acorn Flats RD over Big Porcupine CR 005 is a prestressed concrete tee beam carrying Acorn Flats RD over Big Porcupine CR 005 in Rosebud County, Montana. It was built in 2007, so it is 18 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 49 ft (14.9 m) long and 26 ft wide. If it were closed, the detour would be 47.2 mi (76 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Acorn Flats RD over Big Porcupine CR 005 built?
It was built in 2007, making it 18 years old in 2025.
What condition is Acorn Flats RD over Big Porcupine CR 005 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.
How much traffic does Acorn Flats RD over Big Porcupine CR 005 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Acorn Flats RD over Big Porcupine CR 005?
The structure is 49 ft (14.9 m) long with a longest span of 48 ft (14.6 m) and a deck 26 ft wide.
Who owns Acorn Flats RD over Big Porcupine CR 005?
It is owned by the County Highway Agency.