US Bridges

US 21 over I-26

Good

Lexington County, South Carolina · 8 MI E of Swansea · Structure no. 000000000003382

Built
1960
65 years old, rebuilt 2018
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
273 ft
4 main spans
Daily traffic
3,200
2023 count
Owner
State
State Highway Agency

About this bridge

US 21 over I-26 is a prestressed concrete stringer/multi-beam or girder carrying US 21 over I-26 in Lexington County, South Carolina. It was built in 1960 and reconstructed in 2018, so it is 65 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 3,200 vehicles a day, roughly 6% of them trucks, projected to reach 4,672 by 2043. The structure is 273 ft (83.2 m) long and 32 ft wide.

CarriesUS 21
CrossesI-26
Location8 MI E of Swansea
RouteU.S. Route 21
Coordinates33.76472, -80.96417
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating32.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length273 ft (83.2 m)
Longest span70 ft (21.3 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2023)
Projected traffic4,672 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$551,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 21 over I-26 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2018.

What condition is US 21 over I-26 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does US 21 over I-26 carry?

About 3,200 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 21 over I-26?

The structure is 273 ft (83.2 m) long with a longest span of 70 ft (21.3 m) and a deck 32 ft wide.

Who owns US 21 over I-26?

It is owned by the State Highway Agency.