409th Avenue over North Br Twelve Mile Ck
FairDavison County, South Dakota · 3.7 N & 2 W Ethan · Structure no. 000000018150173
- Built
- 1965
- 60 years old
- Condition
- Fair
- inspected August 2024
- Type
- Channel Beam
- Concrete
- Length
- 26 ft
- 1 main span
- Daily traffic
- 64
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
409th Avenue over North Br Twelve Mile Ck is a concrete channel beam carrying 409th Avenue over North Br Twelve Mile Ck in Davison County, South Dakota. It was built in 1965, so it is 60 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 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 64 vehicles a day, roughly 2% of them trucks, projected to reach 64 by 2032. The structure is 26 ft (7.9 m) long and 32 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 409th Avenue over North Br Twelve Mile Ck built?
It was built in 1965, making it 60 years old in 2025.
What condition is 409th Avenue over North Br Twelve Mile 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 409th Avenue over North Br Twelve Mile Ck carry?
About 64 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 409th Avenue over North Br Twelve Mile Ck?
The structure is 26 ft (7.9 m) long with a longest span of 23 ft (7 m) and a deck 32 ft wide.
Who owns 409th Avenue over North Br Twelve Mile Ck?
It is owned by the County Highway Agency.