IRR US018 over Slim Butte Ck
FairCounty 102, South Dakota · 9 E Fall River CO Line · Structure no. 000000057096359
- Built
- 1953
- 72 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 118 ft
- 3 main spans
- Daily traffic
- 1,294
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR US018 over Slim Butte Ck is a steel stringer/multi-beam or girder carrying IRR US018 over Slim Butte Ck in County 102, South Dakota. It was built in 1953, so it is 72 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 1,294 vehicles a day, roughly 7% of them trucks, projected to reach 1,722 by 2044. The structure is 118 ft (36.1 m) long and 32 ft wide. If it were closed, the detour would be 39.8 mi (64 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 | 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 Slim Butte Ck built?
It was built in 1953, making it 72 years old in 2025.
What condition is IRR US018 over Slim Butte 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 September 2023.
How much traffic does IRR US018 over Slim Butte Ck carry?
About 1,294 vehicles per day (2024 count), of which roughly 7% are trucks.
How long is IRR US018 over Slim Butte Ck?
The structure is 118 ft (36.1 m) long with a longest span of 38 ft (11.5 m) and a deck 32 ft wide.
Who owns IRR US018 over Slim Butte Ck?
It is owned by the State Highway Agency.