470th Avenue over N Fork Whetstone River
FairRoberts County, South Dakota · 3N & 2W of Corona · Structure no. 000000055210381
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected June 2024
- Type
- Slab
- Concrete Continuous
- Length
- 77 ft
- 3 main spans
- Daily traffic
- 55
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
470th Avenue over N Fork Whetstone River is a concrete continuous slab carrying 470th Avenue over N Fork Whetstone River in Roberts County, South Dakota. It was built in 1988, so it is 37 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 55 vehicles a day, roughly 2% of them trucks, projected to reach 55 by 2032. The structure is 77 ft (23.5 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 470th Avenue over N Fork Whetstone River built?
It was built in 1988, making it 37 years old in 2025.
What condition is 470th Avenue over N Fork Whetstone River 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 June 2024.
How much traffic does 470th Avenue over N Fork Whetstone River carry?
About 55 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 470th Avenue over N Fork Whetstone River?
The structure is 77 ft (23.5 m) long with a longest span of 29 ft (8.7 m) and a deck 34 ft wide.
Who owns 470th Avenue over N Fork Whetstone River?
It is owned by the County Highway Agency.