US Bridges

S-45-586 over Br. Clapp Swamp

Fair

Williamsburg County, South Carolina · 6.8 MI NW Cades · Structure no. 000000000004676

Built
1965
60 years old, rebuilt 1994
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
125
2023 count
Owner
State
State Highway Agency

About this bridge

S-45-586 over Br. Clapp Swamp is a concrete slab carrying S-45-586 over Br. Clapp Swamp in Williamsburg County, South Carolina. It was built in 1965 and reconstructed in 1994, so it is 60 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 125 vehicles a day, roughly 5% of them trucks, projected to reach 160 by 2024. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS-45-586
CrossesBr. Clapp Swamp
Location6.8 MI NW Cades
RouteState Highway 586
CountyWilliamsburg County
StateSouth Carolina
Coordinates33.83833, -79.89306
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 protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.3 US tons
Inventory rating17.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 10
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2023)
Projected traffic160 by 2024
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 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-45-586 over Br. Clapp Swamp built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1994.

What condition is S-45-586 over Br. Clapp 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 October 2024.

How much traffic does S-45-586 over Br. Clapp Swamp carry?

About 125 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-45-586 over Br. Clapp Swamp?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-45-586 over Br. Clapp Swamp?

It is owned by the State Highway Agency.