US Bridges

S-45-39 over Boggy Swamp

Good

Williamsburg County, South Carolina · 8.0 MI W Hemingway · Structure no. 000000000001408

Built
2016
9 years old
Condition
Good
inspected August 2024
Type
Slab
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
800
2023 count
Owner
State
State Highway Agency

About this bridge

S-45-39 over Boggy Swamp is a prestressed concrete slab carrying S-45-39 over Boggy Swamp in Williamsburg County, South Carolina. It was built in 2016, so it is 9 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 800 vehicles a day, roughly 12% of them trucks, projected to reach 1,168 by 2043. The structure is 70 ft (21.3 m) long and 35 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-45-39
CrossesBoggy Swamp
Location8.0 MI W Hemingway
RouteState Highway 39
Coordinates33.75472, -79.57556
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.1 US tons
Inventory rating54.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length70 ft (21.3 m)
Longest span70 ft (21.3 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2023)
Projected traffic1,168 by 2043
Trucks12%
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-45-39 over Boggy Swamp built?

It was built in 2016, making it 9 years old in 2025.

What condition is S-45-39 over Boggy 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 August 2024.

How much traffic does S-45-39 over Boggy Swamp carry?

About 800 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is S-45-39 over Boggy Swamp?

The structure is 70 ft (21.3 m) long with a longest span of 70 ft (21.3 m) and a deck 35 ft wide.

Who owns S-45-39 over Boggy Swamp?

It is owned by the State Highway Agency.