Boyd Cooney Dam RD over Rock Creek 027
FairCarbon County, Montana · 1M W Boyd · Structure no. L05001000+08001
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 154 ft
- 2 main spans
- Daily traffic
- 593
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Boyd Cooney Dam RD over Rock Creek 027 is a prestressed concrete stringer/multi-beam or girder carrying Boyd Cooney Dam RD over Rock Creek 027 in Carbon County, Montana. It was built in 1973, so it is 52 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 593 vehicles a day, roughly 3% of them trucks, projected to reach 623 by 2043. The structure is 154 ft (46.9 m) long and 26 ft wide. If it were closed, the detour would be 11.2 mi (18 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Boyd Cooney Dam RD over Rock Creek 027 built?
It was built in 1973, making it 52 years old in 2025.
What condition is Boyd Cooney Dam RD over Rock Creek 027 in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.
How much traffic does Boyd Cooney Dam RD over Rock Creek 027 carry?
About 593 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Boyd Cooney Dam RD over Rock Creek 027?
The structure is 154 ft (46.9 m) long with a longest span of 75 ft (22.9 m) and a deck 26 ft wide.
Who owns Boyd Cooney Dam RD over Rock Creek 027?
It is owned by the County Highway Agency.