US Bridges

US 21/US321 over Congaree Creek

Fair

Lexington County, South Carolina · 2MI NE of Pineridge · Structure no. 000000000000884

Built
1938
87 years old, rebuilt 1985
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
23,200
2023 count
Owner
State
State Highway Agency

About this bridge

US 21/US321 over Congaree Creek is a concrete culvert carrying US 21/US321 over Congaree Creek in Lexington County, South Carolina. It was built in 1938 and reconstructed in 1985, 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 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 23,200 vehicles a day, roughly 5% of them trucks, projected to reach 36,424 by 2043. The structure is 23 ft (7 m) long and 133 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 21/US321
CrossesCongaree Creek
Location2MI NE of Pineridge
RouteU.S. Route 21
Coordinates33.93603, -81.07705
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating28.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width133 ft (40.5 m)
Roadway width100 ft (30.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,200 (2023)
Projected traffic36,424 by 2043
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 21/US321 over Congaree Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1985.

What condition is US 21/US321 over Congaree 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 October 2023.

How much traffic does US 21/US321 over Congaree Creek carry?

About 23,200 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is US 21/US321 over Congaree Creek?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 133 ft wide.

Who owns US 21/US321 over Congaree Creek?

It is owned by the State Highway Agency.