IRR SD1806 over LA Roche Ck
FairStanley County, South Dakota · 24.7 SE JCT US 83 · Structure no. 000000059617374
- Built
- 2007
- 18 years old
- Condition
- Fair
- inspected November 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 25 ft
- 2 main spans
- Daily traffic
- 279
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR SD1806 over LA Roche Ck is a concrete continuous culvert carrying IRR SD1806 over LA Roche Ck in Stanley County, South Dakota. It was built in 2007, so it is 18 years old, younger 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 279 vehicles a day, roughly 7% of them trucks, projected to reach 403 by 2044. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 24.2 mi (39 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 | 9 Excellent | 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 SD1806 over LA Roche Ck built?
It was built in 2007, making it 18 years old in 2025.
What condition is IRR SD1806 over LA Roche 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 November 2023.
How much traffic does IRR SD1806 over LA Roche Ck carry?
About 279 vehicles per day (2024 count), of which roughly 7% are trucks.
How long is IRR SD1806 over LA Roche Ck?
The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m).
Who owns IRR SD1806 over LA Roche Ck?
It is owned by the State Highway Agency.