Four Mile Road over Flat Ck
FairPerkins County, South Dakota · 3E 3.5S White Butte · Structure no. 000000053320043
- Built
- 1977
- 48 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 60
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
Four Mile Road over Flat Ck is a prestressed concrete stringer/multi-beam or girder carrying Four Mile Road over Flat Ck in Perkins County, South Dakota. It was built in 1977, so it is 48 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 60 vehicles a day, roughly 2% of them trucks, projected to reach 60 by 2032. The structure is 30 ft (9.1 m) long and 23 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 Four Mile Road over Flat Ck built?
It was built in 1977, making it 48 years old in 2025.
What condition is Four Mile Road over Flat 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 May 2023.
How much traffic does Four Mile Road over Flat Ck carry?
About 60 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is Four Mile Road over Flat Ck?
The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 23 ft wide.
Who owns Four Mile Road over Flat Ck?
It is owned by the County Highway Agency.