US 21 over Rocky Creek
PoorChester County, South Carolina · City of Great Falls · Structure no. 000000000000843
- Built
- 1938
- 87 years old, rebuilt 1975
- Condition
- Poor
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 403 ft
- 4 main spans
- Daily traffic
- 4,700
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 21 over Rocky Creek is a steel continuous stringer/multi-beam or girder carrying US 21 over Rocky Creek in Chester County, South Carolina. It was built in 1938 and reconstructed in 1975, so it is 87 years old, older than the South Carolina average of 48 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.
It carries about 4,700 vehicles a day, roughly 10% of them trucks, projected to reach 6,862 by 2043. The structure is 403 ft (122.7 m) long and 47 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 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 US 21 over Rocky Creek built?
It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1975.
What condition is US 21 over Rocky 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 January 2025.
How much traffic does US 21 over Rocky Creek carry?
About 4,700 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is US 21 over Rocky Creek?
The structure is 403 ft (122.7 m) long with a longest span of 110 ft (33.5 m) and a deck 47 ft wide.
Who owns US 21 over Rocky Creek?
It is owned by the State Highway Agency.