399th Avenue over North Br Twelve Mile Ck
PoorDavison County, South Dakota · 12 W & 0.4 N Ethan · Structure no. 000000018050206
- Built
- 1972
- 53 years old
- Condition
- Poor
- inspected July 2024
- Type
- Channel Beam
- Concrete
- Length
- 28 ft
- 1 main span
- Daily traffic
- 71
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
399th Avenue over North Br Twelve Mile Ck is a concrete channel beam carrying 399th Avenue over North Br Twelve Mile Ck in Davison County, South Dakota. It was built in 1972, so it is 53 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 71 vehicles a day, roughly 2% of them trucks, projected to reach 71 by 2032. The structure is 28 ft (8.4 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 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, 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 399th Avenue over North Br Twelve Mile Ck built?
It was built in 1972, making it 53 years old in 2025.
What condition is 399th Avenue over North Br Twelve Mile 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 July 2024.
How much traffic does 399th Avenue over North Br Twelve Mile Ck carry?
About 71 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 399th Avenue over North Br Twelve Mile Ck?
The structure is 28 ft (8.4 m) long with a longest span of 27 ft (8.2 m) and a deck 32 ft wide.
Who owns 399th Avenue over North Br Twelve Mile Ck?
It is owned by the County Highway Agency.