409th Avenue over South Fork Twelve Mile C
FairDavison County, South Dakota · 2.7 S & 2 W Ethan · Structure no. 000000018150237
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected August 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 46 ft
- 1 main span
- Daily traffic
- 45
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
409th Avenue over South Fork Twelve Mile C is a prestressed concrete tee beam carrying 409th Avenue over South Fork Twelve Mile C in Davison County, South Dakota. It was built in 1978, so it is 47 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 5 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 45 vehicles a day, roughly 2% of them trucks, projected to reach 45 by 2032. The structure is 46 ft (14 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 409th Avenue over South Fork Twelve Mile C built?
It was built in 1978, making it 47 years old in 2025.
What condition is 409th Avenue over South Fork Twelve Mile C 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 409th Avenue over South Fork Twelve Mile C carry?
About 45 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 409th Avenue over South Fork Twelve Mile C?
The structure is 46 ft (14 m) long with a longest span of 43 ft (13.1 m) and a deck 31 ft wide.
Who owns 409th Avenue over South Fork Twelve Mile C?
It is owned by the County Highway Agency.