IRR Ar SD020 over Lyon Ck
FairPerkins County, South Dakota · 0.9 W Ziebach CO Line · Structure no. 000000053454350
- Built
- 1962
- 63 years old
- Condition
- Fair
- inspected July 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 25 ft
- 2 main spans
- Daily traffic
- 125
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR Ar SD020 over Lyon Ck is a concrete continuous culvert carrying IRR Ar SD020 over Lyon Ck in Perkins County, South Dakota. It was built in 1962, so it is 63 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 125 vehicles a day, roughly 27% of them trucks, projected to reach 187 by 2044. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 44.1 mi (71 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR Ar SD020 over Lyon Ck built?
It was built in 1962, making it 63 years old in 2025.
What condition is IRR Ar SD020 over Lyon 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 2023.
How much traffic does IRR Ar SD020 over Lyon Ck carry?
About 125 vehicles per day (2024 count), of which roughly 27% are trucks.
How long is IRR Ar SD020 over Lyon Ck?
The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m).
Who owns IRR Ar SD020 over Lyon Ck?
It is owned by the State Highway Agency.