US Bridges

S-6-80 over Gant Mill Creek

Fair

Barnwell County, South Carolina · 6 MI SW Barnwell · Structure no. 000000000002476

Built
1957
68 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
42 ft
3 main spans
Daily traffic
225
2023 count
Owner
State
State Highway Agency

About this bridge

S-6-80 over Gant Mill Creek is a concrete slab carrying S-6-80 over Gant Mill Creek in Barnwell County, South Carolina. It was built in 1957, so it is 68 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 225 vehicles a day, roughly 9% of them trucks, projected to reach 313 by 2043. The structure is 42 ft (12.8 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesS-6-80
CrossesGant Mill Creek
Location6 MI SW Barnwell
RouteState Highway 80
Coordinates33.17254, -81.4507
Functional classRural Minor Collector

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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating20.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 10
Structure length42 ft (12.8 m)
Longest span14 ft (4.3 m)
Deck width31 ft (9.3 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic313 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-6-80 over Gant Mill Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is S-6-80 over Gant Mill 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 June 2023.

How much traffic does S-6-80 over Gant Mill Creek carry?

About 225 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is S-6-80 over Gant Mill Creek?

The structure is 42 ft (12.8 m) long with a longest span of 14 ft (4.3 m) and a deck 31 ft wide.

Who owns S-6-80 over Gant Mill Creek?

It is owned by the State Highway Agency.