US Bridges

S-27-75 over Bay Swamp

Fair

Jasper County, South Carolina · 9 MI NW Ridgeland · Structure no. 000000000009033

Built
1996
29 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
66 ft
3 main spans
Daily traffic
225
2023 count
Owner
State
State Highway Agency

About this bridge

S-27-75 over Bay Swamp is a concrete continuous slab carrying S-27-75 over Bay Swamp in Jasper 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 225 vehicles a day, roughly 5% of them trucks, projected to reach 288 by 2043. The structure is 66 ft (20.1 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-27-75
CrossesBay Swamp
Location9 MI NW Ridgeland
RouteState Highway 75
Coordinates32.61206, -81.00926
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
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 rating67.5 US tons
Inventory rating52.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length66 ft (20.1 m)
Longest span22 ft (6.7 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic288 by 2043
Trucks5%
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-27-75 over Bay Swamp built?

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

What condition is S-27-75 over Bay 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 January 2025.

How much traffic does S-27-75 over Bay Swamp carry?

About 225 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-27-75 over Bay Swamp?

The structure is 66 ft (20.1 m) long with a longest span of 22 ft (6.7 m) and a deck 37 ft wide.

Who owns S-27-75 over Bay Swamp?

It is owned by the State Highway Agency.