471st Avenue over Trib. to Big Sioux River
FairMoody County, South Dakota · 1E & 10.9N of Colman · Structure no. 000000051050041
- Built
- 1925
- 100 years old, rebuilt 1938
- Condition
- Fair
- inspected July 2024
- Type
- Slab
- Concrete Continuous
- Length
- 36 ft
- 3 main spans
- Daily traffic
- 614
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
471st Avenue over Trib. to Big Sioux River is a concrete continuous slab carrying 471st Avenue over Trib. to Big Sioux River in Moody County, South Dakota. It was built in 1925 and reconstructed in 1938, so it is 100 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 614 vehicles a day, roughly 3% of them trucks, projected to reach 614 by 2032. The structure is 36 ft (11 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 471st Avenue over Trib. to Big Sioux River built?
It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1938.
What condition is 471st Avenue over Trib. to Big Sioux River 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 July 2024.
How much traffic does 471st Avenue over Trib. to Big Sioux River carry?
About 614 vehicles per day (2022 count), of which roughly 3% are trucks.
How long is 471st Avenue over Trib. to Big Sioux River?
The structure is 36 ft (11 m) long with a longest span of 11 ft (3.4 m) and a deck 33 ft wide.
Who owns 471st Avenue over Trib. to Big Sioux River?
It is owned by the County Highway Agency.