IRR US018 over Choteau Ck
FairCharles Mix County, South Dakota · 3.4 E of US 281 Junction · Structure no. 000000012514180
- Built
- 1960
- 65 years old
- Condition
- Fair
- inspected July 2024
- Type
- Slab
- Concrete Continuous
- Length
- 242 ft
- 10 main spans
- Daily traffic
- 387
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR US018 over Choteau Ck is a concrete continuous slab carrying IRR US018 over Choteau Ck in Charles Mix County, South Dakota. It was built in 1960, so it is 65 years old, older than the South Dakota average of 48.9 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 387 vehicles a day, roughly 16% of them trucks, projected to reach 558 by 2044. The structure is 242 ft (73.8 m) long and 34 ft wide. If it were closed, the detour would be 21.7 mi (35 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 IRR US018 over Choteau Ck built?
It was built in 1960, making it 65 years old in 2025.
What condition is IRR US018 over Choteau Ck 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 July 2024.
How much traffic does IRR US018 over Choteau Ck carry?
About 387 vehicles per day (2024 count), of which roughly 16% are trucks.
How long is IRR US018 over Choteau Ck?
The structure is 242 ft (73.8 m) long with a longest span of 23 ft (7.1 m) and a deck 34 ft wide.
Who owns IRR US018 over Choteau Ck?
It is owned by the State Highway Agency.