IRR US018 over Trib to Oak Ck
FairTodd County, South Dakota · 9.4 W Tripp CO Line · Structure no. 000000061431020
- Built
- 2005
- 20 years old
- Condition
- Fair
- inspected November 2021
- Type
- Culvert
- Concrete Continuous
- Length
- 24 ft
- 2 main spans
- Daily traffic
- 1,303
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
IRR US018 over Trib to Oak Ck is a concrete continuous culvert carrying IRR US018 over Trib to Oak Ck in Todd County, South Dakota. It was built in 2005, so it is 20 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 1,303 vehicles a day, roughly 17% of them trucks, projected to reach 1,902 by 2044. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 29.8 mi (48 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 | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR US018 over Trib to Oak Ck built?
It was built in 2005, making it 20 years old in 2025.
What condition is IRR US018 over Trib to Oak 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 2021.
How much traffic does IRR US018 over Trib to Oak Ck carry?
About 1,303 vehicles per day (2024 count), of which roughly 17% are trucks.
How long is IRR US018 over Trib to Oak Ck?
The structure is 24 ft (7.3 m) long with a longest span of 11 ft (3.5 m).
Who owns IRR US018 over Trib to Oak Ck?
It is owned by the State Highway Agency.