427 Ave over Rock Ck
PoorPosted for loadMiner County, South Dakota · 2.0E & 1.6S Carthage · Structure no. 000000049090036
- Built
- 1901
- 124 years old
- Condition
- Poor
- inspected August 2024
- Type
- Channel Beam
- Concrete
- Length
- 32 ft
- 1 main span
- Daily traffic
- 75
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
427 Ave over Rock Ck is a concrete channel beam carrying 427 Ave over Rock Ck in Miner County, South Dakota. It was built in 1901, so it is 124 years old, older than the South Dakota average of 48.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 75 vehicles a day, roughly 3% of them trucks, projected to reach 75 by 2032. The structure is 32 ft (9.8 m) long and 25 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 427 Ave over Rock Ck built?
It was built in 1901, making it 124 years old in 2025.
What condition is 427 Ave over Rock Ck in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.
How much traffic does 427 Ave over Rock Ck carry?
About 75 vehicles per day (2022 count), of which roughly 3% are trucks.
How long is 427 Ave over Rock Ck?
The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 25 ft wide.
Who owns 427 Ave over Rock Ck?
It is owned by the County Highway Agency.