US 321 Byp over Tan Yard Branch
FairChester County, South Carolina · Chester City Limits · Structure no. 000000000006442
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected August 2023
- Type
- Culvert
- Concrete
- Length
- 25 ft
- 2 main spans
- Daily traffic
- 6,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 321 Byp over Tan Yard Branch is a concrete culvert carrying US 321 Byp over Tan Yard Branch in Chester County, South Carolina. It was built in 1974, so it is 51 years old, older than the South Carolina average of 48 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 6,000 vehicles a day, roughly 13% of them trucks, projected to reach 9,360 by 2043. The structure is 25 ft (7.6 m) long. 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 |
|---|---|---|
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 321 Byp over Tan Yard Branch built?
It was built in 1974, making it 51 years old in 2025.
What condition is US 321 Byp over Tan Yard Branch 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 August 2023.
How much traffic does US 321 Byp over Tan Yard Branch carry?
About 6,000 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is US 321 Byp over Tan Yard Branch?
The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).
Who owns US 321 Byp over Tan Yard Branch?
It is owned by the State Highway Agency.