231 ST over Rock Ck
FairMiner County, South Dakota · 2N & 6.6W Howard · Structure no. 000000049094110
- Built
- 2005
- 20 years old
- Condition
- Fair
- inspected August 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 60 ft
- 1 main span
- Daily traffic
- 10
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
231 ST over Rock Ck is a prestressed concrete tee beam carrying 231 ST over Rock Ck in Miner 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 10 vehicles a day, roughly 9% of them trucks, projected to reach 11 by 2032. The structure is 60 ft (18.4 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 231 ST over Rock Ck built?
It was built in 2005, making it 20 years old in 2025.
What condition is 231 ST over Rock 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 August 2024.
How much traffic does 231 ST over Rock Ck carry?
About 10 vehicles per day (2022 count), of which roughly 9% are trucks.
How long is 231 ST over Rock Ck?
The structure is 60 ft (18.4 m) long with a longest span of 56 ft (17.2 m) and a deck 31 ft wide.
Who owns 231 ST over Rock Ck?
It is owned by the County Highway Agency.