US 21 over Congaree River
FairLexington County, South Carolina · 1 MI SW of Columbia · Structure no. 000000000001965
- Built
- 1953
- 72 years old
- Condition
- Fair
- inspected November 2023
- Type
- Girder and Floorbeam System
- Steel Continuous
- Length
- 1,464 ft
- 13 main spans
- Daily traffic
- 28,000
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 21 over Congaree River is a steel continuous girder and floorbeam system carrying US 21 over Congaree River in Lexington County, South Carolina. It was built in 1953, so it is 72 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 5 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 28,000 vehicles a day, roughly 3% of them trucks, projected to reach 43,960 by 2043. The structure is 1,464 ft (446.2 m) long and 54 ft wide.
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, 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 Congaree River built?
It was built in 1953, making it 72 years old in 2025.
What condition is US 21 over Congaree River 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 November 2023.
How much traffic does US 21 over Congaree River carry?
About 28,000 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is US 21 over Congaree River?
The structure is 1,464 ft (446.2 m) long with a longest span of 114 ft (34.7 m) and a deck 54 ft wide.
Who owns US 21 over Congaree River?
It is owned by the State Highway Agency.