405th Avenue over North Br Twelve Mile Ck
FairDavison County, South Dakota · 6.0 W & 0.5 S Ethan · Structure no. 000000018110213
- Built
- 1923
- 102 years old, rebuilt 1986
- Condition
- Fair
- inspected August 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 40 ft
- 1 main span
- Daily traffic
- 85
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
405th Avenue over North Br Twelve Mile Ck is a prestressed concrete tee beam carrying 405th Avenue over North Br Twelve Mile Ck in Davison County, South Dakota. It was built in 1923 and reconstructed in 1986, so it is 102 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 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 85 vehicles a day, roughly 2% of them trucks, projected to reach 83 by 2032. The structure is 40 ft (12.2 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 | 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 405th Avenue over North Br Twelve Mile Ck built?
It was built in 1923, making it 102 years old in 2025. It was reconstructed in 1986.
What condition is 405th 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 405th Avenue over North Br Twelve Mile Ck carry?
About 85 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 405th Avenue over North Br Twelve Mile Ck?
The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 31 ft wide.
Who owns 405th Avenue over North Br Twelve Mile Ck?
It is owned by the County Highway Agency.