477th Avenue over Six Mile Ck
GoodBrookings County, South Dakota · 1W & 0.3N White · Structure no. 000000006230072
- Built
- 1999
- 26 years old
- Condition
- Good
- inspected September 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 65 ft
- 1 main span
- Daily traffic
- 92
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
477th Avenue over Six Mile Ck is a prestressed concrete tee beam carrying 477th Avenue over Six Mile Ck in Brookings County, South Dakota. It was built in 1999, so it is 26 years old, younger than the South Dakota average of 48.9 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 92 vehicles a day, roughly 2% of them trucks, projected to reach 92 by 2032. The structure is 65 ft (19.8 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 477th Avenue over Six Mile Ck built?
It was built in 1999, making it 26 years old in 2025.
What condition is 477th Avenue over Six Mile Ck in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.
How much traffic does 477th Avenue over Six Mile Ck carry?
About 92 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 477th Avenue over Six Mile Ck?
The structure is 65 ft (19.8 m) long with a longest span of 65 ft (19.8 m) and a deck 27 ft wide.
Who owns 477th Avenue over Six Mile Ck?
It is owned by the County Highway Agency.