421 Ave over Redstone Ck
PoorMiner County, South Dakota · 7.5N Fedora · Structure no. 000000049030055
- Built
- 1930
- 95 years old, rebuilt 1968
- Condition
- Poor
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 41 ft
- 1 main span
- Daily traffic
- 50
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
421 Ave over Redstone Ck is a steel stringer/multi-beam or girder carrying 421 Ave over Redstone Ck in Miner County, South Dakota. It was built in 1930 and reconstructed in 1968, so it is 95 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.
It carries about 50 vehicles a day, roughly 3% of them trucks, projected to reach 50 by 2032. The structure is 41 ft (12.5 m) long and 35 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 421 Ave over Redstone Ck built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1968.
What condition is 421 Ave over Redstone 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 421 Ave over Redstone Ck carry?
About 50 vehicles per day (2022 count), of which roughly 3% are trucks.
How long is 421 Ave over Redstone Ck?
The structure is 41 ft (12.5 m) long with a longest span of 39 ft (11.9 m) and a deck 35 ft wide.
Who owns 421 Ave over Redstone Ck?
It is owned by the County Highway Agency.