477th Avenue over Nine Mile Creek
FairLincoln County, South Dakota · 1E & 1.5S of Harrisburg · Structure no. 000000042130065
- Built
- 1977
- 48 years old
- Condition
- Fair
- inspected June 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 46 ft
- 1 main span
- Daily traffic
- 75
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
477th Avenue over Nine Mile Creek is a prestressed concrete tee beam carrying 477th Avenue over Nine Mile Creek in Lincoln County, South Dakota. It was built in 1977, so it is 48 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 fair condition with a lowest component rating of 6 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 75 vehicles a day, roughly 2% of them trucks, projected to reach 75 by 2032. The structure is 46 ft (14 m) long and 24 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 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 477th Avenue over Nine Mile Creek built?
It was built in 1977, making it 48 years old in 2025.
What condition is 477th Avenue over Nine Mile Creek 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 June 2024.
How much traffic does 477th Avenue over Nine Mile Creek carry?
About 75 vehicles per day (2022 count), of which roughly 2% are trucks.
How long is 477th Avenue over Nine Mile Creek?
The structure is 46 ft (14 m) long with a longest span of 45 ft (13.7 m) and a deck 24 ft wide.
Who owns 477th Avenue over Nine Mile Creek?
It is owned by the County Highway Agency.