US Bridges

S-21-543 over Br of Lynches Lake

Fair

Florence County, South Carolina · 3MI W Johnsonville · Structure no. 000000000003279

Built
1960
65 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
225
2023 count
Owner
State
State Highway Agency

About this bridge

S-21-543 over Br of Lynches Lake is a concrete slab carrying S-21-543 over Br of Lynches Lake in Florence County, South Carolina. It was built in 1960, so it is 65 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 225 vehicles a day, roughly 5% of them trucks, projected to reach 288 by 2043. The structure is 30 ft (9.1 m) long and 28 ft wide.

CarriesS-21-543
CrossesBr of Lynches Lake
Location3MI W Johnsonville
RouteState Highway 543
Coordinates33.82722, -79.50556
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 protection7 GoodSome minor problems.
Last inspectionApril 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 adequacy6: Equal to present minimum 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 spans2
Design loadH 10
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic288 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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-21-543 over Br of Lynches Lake built?

It was built in 1960, making it 65 years old in 2025.

What condition is S-21-543 over Br of Lynches Lake 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 April 2024.

How much traffic does S-21-543 over Br of Lynches Lake carry?

About 225 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-21-543 over Br of Lynches Lake?

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-21-543 over Br of Lynches Lake?

It is owned by the State Highway Agency.