475th Avenue over Big Sioux River
FairPosted for loadMoody County, South Dakota · 1.1N & 12W of Ward · Structure no. 000000051090019
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 212 ft
- 3 main spans
- Daily traffic
- 67
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
475th Avenue over Big Sioux River is a steel stringer/multi-beam or girder carrying 475th Avenue over Big Sioux River in Moody County, South Dakota. It was built in 1966, so it is 59 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. Its operating status is: posted for load restriction.
It carries about 67 vehicles a day, roughly 2% of them trucks, projected to reach 83 by 2032. The structure is 212 ft (64.6 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 475th Avenue over Big Sioux River built?
It was built in 1966, making it 59 years old in 2025.
What condition is 475th Avenue over 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 475th Avenue over Big Sioux River carry?
About 67 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 475th Avenue over Big Sioux River?
The structure is 212 ft (64.6 m) long with a longest span of 80 ft (24.4 m) and a deck 32 ft wide.
Who owns 475th Avenue over Big Sioux River?
It is owned by the County Highway Agency.