US 321 over Miller Creek
FairAllendale County, South Carolina · 1MI W of Sycamore · Structure no. 000000000000665
- Built
- 1921
- 104 years old, rebuilt 1969
- Condition
- Fair
- inspected May 2024
- Type
- Tee Beam
- Concrete
- Length
- 66 ft
- 3 main spans
- Daily traffic
- 1,700
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 321 over Miller Creek is a concrete tee beam carrying US 321 over Miller Creek in Allendale County, South Carolina. It was built in 1921 and reconstructed in 1969, so it is 104 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 1,700 vehicles a day, roughly 26% of them trucks, projected to reach 2,958 by 2043. The structure is 66 ft (20.1 m) long and 48 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 321 over Miller Creek built?
It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1969.
What condition is US 321 over Miller 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 May 2024.
How much traffic does US 321 over Miller Creek carry?
About 1,700 vehicles per day (2023 count), of which roughly 26% are trucks.
How long is US 321 over Miller Creek?
The structure is 66 ft (20.1 m) long with a longest span of 22 ft (6.7 m) and a deck 48 ft wide.
Who owns US 321 over Miller Creek?
It is owned by the State Highway Agency.