US Bridges

S-16-495 over Back Swamp

FairPosted for load

Darlington County, South Carolina · 12MI N Florence · Structure no. 000000000004302

Built
1964
61 years old, rebuilt 1999
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
60 ft
4 main spans
Daily traffic
1,200
2023 count
Owner
State
State Highway Agency

About this bridge

S-16-495 over Back Swamp is a concrete slab carrying S-16-495 over Back Swamp in Darlington County, South Carolina. It was built in 1964 and reconstructed in 1999, so it is 61 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. Its operating status is: posted for load restriction.

It carries about 1,200 vehicles a day, roughly 26% of them trucks, projected to reach 1,512 by 2043. The structure is 60 ft (18.3 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesS-16-495
CrossesBack Swamp
Location12MI N Florence
RouteState Highway 495
CountyDarlington County
StateSouth Carolina
Coordinates34.28929, -79.70247
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
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating17.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadH 10
Structure length60 ft (18.3 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2023)
Projected traffic1,512 by 2043
Trucks26%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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-16-495 over Back Swamp built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1999.

What condition is S-16-495 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 January 2025.

How much traffic does S-16-495 over Back Swamp carry?

About 1,200 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is S-16-495 over Back Swamp?

The structure is 60 ft (18.3 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-16-495 over Back Swamp?

It is owned by the State Highway Agency.