US Bridges

US 21 over RR CSXT

Fair

Lexington County, South Carolina · 7 MI S of Columbia · Structure no. 000000000000883

Built
1938
87 years old, rebuilt 1955
Condition
Fair
inspected December 2024
Type
Tee Beam
Concrete
Length
156 ft
3 main spans
Daily traffic
32,800
2023 count
Owner
State
State Highway Agency

About this bridge

US 21 over RR CSXT is a concrete tee beam carrying US 21 over RR CSXT in Lexington County, South Carolina. It was built in 1938 and reconstructed in 1955, 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 32,800 vehicles a day, roughly 12% of them trucks, projected to reach 45,264 by 2043. The structure is 156 ft (47.5 m) long and 61 ft wide.

Location

Open in Google Maps
CarriesUS 21
CrossesRR CSXT
Location7 MI S of Columbia
RouteU.S. Route 21
CountyLexington County
StateSouth Carolina
Coordinates33.90909, -81.06704
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length156 ft (47.5 m)
Longest span52 ft (15.8 m)
Deck width61 ft (18.5 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,800 (2023)
Projected traffic45,264 by 2043
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 21 over RR CSXT built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1955.

What condition is US 21 over RR CSXT 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 December 2024.

How much traffic does US 21 over RR CSXT carry?

About 32,800 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 21 over RR CSXT?

The structure is 156 ft (47.5 m) long with a longest span of 52 ft (15.8 m) and a deck 61 ft wide.

Who owns US 21 over RR CSXT?

It is owned by the State Highway Agency.