US Bridges

S-43-46 over Cowpen Swamp

Good

Sumter County, South Carolina · 5 MI NE of Sumter · Structure no. 000000000002627

Built
2015
10 years old
Condition
Good
inspected June 2023
Type
Slab
Prestressed Concrete
Length
120 ft
2 main spans
Daily traffic
1,000
2023 count
Owner
State
State Highway Agency

About this bridge

S-43-46 over Cowpen Swamp is a prestressed concrete slab carrying S-43-46 over Cowpen Swamp in Sumter County, South Carolina. It was built in 2015, so it is 10 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,000 vehicles a day, roughly 10% of them trucks, projected to reach 1,460 by 2043. The structure is 120 ft (36.6 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-43-46
CrossesCowpen Swamp
Location5 MI NE of Sumter
RouteState Highway 46
Coordinates33.98096, -80.28936
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating40.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHL 93
Structure length120 ft (36.6 m)
Longest span60 ft (18.3 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2023)
Projected traffic1,460 by 2043
Trucks10%
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-43-46 over Cowpen Swamp built?

It was built in 2015, making it 10 years old in 2025.

What condition is S-43-46 over Cowpen Swamp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does S-43-46 over Cowpen Swamp carry?

About 1,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is S-43-46 over Cowpen Swamp?

The structure is 120 ft (36.6 m) long with a longest span of 60 ft (18.3 m) and a deck 36 ft wide.

Who owns S-43-46 over Cowpen Swamp?

It is owned by the State Highway Agency.