US Bridges

Sc 403 over Lynches River Swamp

Good

Florence County, South Carolina · At Sardis · Structure no. 000000000008349

Built
1990
35 years old
Condition
Good
inspected March 2024
Type
Slab
Prestressed Concrete
Length
90 ft
3 main spans
Daily traffic
2,300
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 403 over Lynches River Swamp is a prestressed concrete slab carrying Sc 403 over Lynches River Swamp in Florence County, South Carolina. It was built in 1990, so it is 35 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,300 vehicles a day, roughly 13% of them trucks, projected to reach 3,358 by 2043. The structure is 90 ft (27.4 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSc 403
CrossesLynches River Swamp
LocationAt Sardis
RouteState Highway 403
Coordinates34.03083, -79.94806
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.9 US tons
Inventory rating49.6 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length90 ft (27.4 m)
Longest span30 ft (9.1 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2023)
Projected traffic3,358 by 2043
Trucks13%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 403 over Lynches River Swamp built?

It was built in 1990, making it 35 years old in 2025.

What condition is Sc 403 over Lynches River 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 March 2024.

How much traffic does Sc 403 over Lynches River Swamp carry?

About 2,300 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Sc 403 over Lynches River Swamp?

The structure is 90 ft (27.4 m) long with a longest span of 30 ft (9.1 m) and a deck 37 ft wide.

Who owns Sc 403 over Lynches River Swamp?

It is owned by the State Highway Agency.