US Bridges

US 76 over Back Swamp

Fair

Lee County, South Carolina · 1 MI NE of Lynchburg · Structure no. 000000000002787

Built
1920
105 years old, rebuilt 1958
Condition
Fair
inspected April 2024
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
2,200
2023 count
Owner
State
State Highway Agency

About this bridge

US 76 over Back Swamp is a concrete culvert carrying US 76 over Back Swamp in Lee County, South Carolina. It was built in 1920 and reconstructed in 1958, so it is 105 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 2,200 vehicles a day, roughly 8% of them trucks, projected to reach 3,498 by 2043. The structure is 32 ft (9.8 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 76
CrossesBack Swamp
Location1 MI NE of Lynchburg
RouteU.S. Route 76
CountyLee County
StateSouth Carolina
Coordinates34.06536, -80.06451
Functional classRural Minor 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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.7 US tons
Inventory rating23.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 15
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width46 ft (14.1 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2023)
Projected traffic3,498 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 76 over Back Swamp built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1958.

What condition is US 76 over Back Swamp 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 April 2024.

How much traffic does US 76 over Back Swamp carry?

About 2,200 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 76 over Back Swamp?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 46 ft wide.

Who owns US 76 over Back Swamp?

It is owned by the State Highway Agency.