US Bridges

S-45-585 over Kingstree Swamp

Fair

Williamsburg County, South Carolina · 8.0 MI NW Cades · Structure no. 000000000006799

Built
1975
50 years old, rebuilt 1996
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
325
2023 count
Owner
State
State Highway Agency

About this bridge

S-45-585 over Kingstree Swamp is a concrete slab carrying S-45-585 over Kingstree Swamp in Williamsburg County, South Carolina. It was built in 1975 and reconstructed in 1996, so it is 50 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 325 vehicles a day, roughly 3% of them trucks, projected to reach 416 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesS-45-585
CrossesKingstree Swamp
Location8.0 MI NW Cades
RouteState Highway 585
Coordinates33.88011, -79.87326
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior 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 spans3
Design loadH 10
Structure length45 ft (13.7 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 traffic325 (2023)
Projected traffic416 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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-45-585 over Kingstree Swamp built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1996.

What condition is S-45-585 over Kingstree 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 September 2024.

How much traffic does S-45-585 over Kingstree Swamp carry?

About 325 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S-45-585 over Kingstree Swamp?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-45-585 over Kingstree Swamp?

It is owned by the State Highway Agency.