US Bridges

S-25-13 over Whippy Swamp

Fair

Hampton County, South Carolina · 6MI NE Varnville · Structure no. 000000000009020

Built
1996
29 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete
Length
90 ft
6 main spans
Daily traffic
400
2023 count
Owner
State
State Highway Agency

About this bridge

S-25-13 over Whippy Swamp is a concrete slab carrying S-25-13 over Whippy Swamp in Hampton County, South Carolina. It was built in 1996, so it is 29 years old, younger 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 400 vehicles a day, roughly 12% of them trucks, projected to reach 584 by 2043. The structure is 90 ft (27.4 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-25-13
CrossesWhippy Swamp
Location6MI NE Varnville
RouteState Highway 13
Coordinates32.9063, -81.00994
Functional classRural Major 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating41.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span15 ft (4.6 m)
Deck width38 ft (11.7 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic584 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 S-25-13 over Whippy Swamp built?

It was built in 1996, making it 29 years old in 2025.

What condition is S-25-13 over Whippy 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 March 2023.

How much traffic does S-25-13 over Whippy Swamp carry?

About 400 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is S-25-13 over Whippy Swamp?

The structure is 90 ft (27.4 m) long with a longest span of 15 ft (4.6 m) and a deck 38 ft wide.

Who owns S-25-13 over Whippy Swamp?

It is owned by the State Highway Agency.