477th Avenue over Big Slough Creek
PoorPosted for loadRoberts County, South Dakota · 4E & 1.1N of Rosholt · Structure no. 000000055280038
- Built
- 1955
- 70 years old
- Condition
- Poor
- inspected June 2024
- Type
- Channel Beam
- Concrete
- Length
- 25 ft
- 1 main span
- Daily traffic
- 22
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
477th Avenue over Big Slough Creek is a concrete channel beam carrying 477th Avenue over Big Slough Creek in Roberts County, South Dakota. It was built in 1955, so it is 70 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. Its operating status is: posted for load restriction.
It carries about 22 vehicles a day, roughly 2% of them trucks, projected to reach 22 by 2032. The structure is 25 ft (7.6 m) long and 29 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 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 477th Avenue over Big Slough Creek built?
It was built in 1955, making it 70 years old in 2025.
What condition is 477th Avenue over Big Slough Creek 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 June 2024.
How much traffic does 477th Avenue over Big Slough Creek carry?
About 22 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 477th Avenue over Big Slough Creek?
The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 29 ft wide.
Who owns 477th Avenue over Big Slough Creek?
It is owned by the County Highway Agency.