21 Mile RD over N Fk Crooked Creek 079
FairYellowstone County, Montana · 20M N Billings · Structure no. L56701018+03001
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected January 2025
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 24 ft
- 1 main span
- Daily traffic
- 68
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
21 Mile RD over N Fk Crooked Creek 079 is a prestressed concrete tee beam carrying 21 Mile RD over N Fk Crooked Creek 079 in Yellowstone County, Montana. It was built in 1965, so it is 60 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 68 vehicles a day, roughly 3% of them trucks, projected to reach 72 by 2043. The structure is 24 ft (7.3 m) long and 25 ft wide. If it were closed, the detour would be 14.3 mi (23 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 21 Mile RD over N Fk Crooked Creek 079 built?
It was built in 1965, making it 60 years old in 2025.
What condition is 21 Mile RD over N Fk Crooked Creek 079 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 January 2025.
How much traffic does 21 Mile RD over N Fk Crooked Creek 079 carry?
About 68 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is 21 Mile RD over N Fk Crooked Creek 079?
The structure is 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 25 ft wide.
Who owns 21 Mile RD over N Fk Crooked Creek 079?
It is owned by the County Highway Agency.