Carlson RD over Flat Creek 034
FairCascade County, Montana · 12M E Cascade · Structure no. L07417001+09001
- Built
- 1938
- 87 years old, rebuilt 1970
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 24 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Carlson RD over Flat Creek 034 is a steel stringer/multi-beam or girder carrying Carlson RD over Flat Creek 034 in Cascade County, Montana. It was built in 1938 and reconstructed in 1970, so it is 87 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 24 ft (7.3 m) long and 26 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Carlson RD over Flat Creek 034 built?
It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1970.
What condition is Carlson RD over Flat Creek 034 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 2024.
How much traffic does Carlson RD over Flat Creek 034 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Carlson RD over Flat Creek 034?
The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 26 ft wide.
Who owns Carlson RD over Flat Creek 034?
It is owned by the County Highway Agency.