US Bridges

S-21-278 over Lynches Lake

Good

Florence County, South Carolina · Lake City · Structure no. 000000000009165

Built
1997
28 years old
Condition
Good
inspected March 2023
Type
Slab
Concrete Continuous
Length
132 ft
4 main spans
Daily traffic
4,000
2023 count
Owner
State
State Highway Agency

About this bridge

S-21-278 over Lynches Lake is a concrete continuous slab carrying S-21-278 over Lynches Lake in Florence County, South Carolina. It was built in 1997, so it is 28 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 4,000 vehicles a day, roughly 7% of them trucks, projected to reach 5,640 by 2043. The structure is 132 ft (40.2 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS-21-278
CrossesLynches Lake
LocationLake City
RouteState Highway 278
CountyFlorence County
StateSouth Carolina
Coordinates33.88208, -79.76449
Functional classUrban Minor Arterial

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating47.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length132 ft (40.2 m)
Longest span33 ft (10.1 m)
Deck width41 ft (12.4 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2023)
Projected traffic5,640 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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-21-278 over Lynches Lake built?

It was built in 1997, making it 28 years old in 2025.

What condition is S-21-278 over Lynches Lake 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 2023.

How much traffic does S-21-278 over Lynches Lake carry?

About 4,000 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-21-278 over Lynches Lake?

The structure is 132 ft (40.2 m) long with a longest span of 33 ft (10.1 m) and a deck 41 ft wide.

Who owns S-21-278 over Lynches Lake?

It is owned by the State Highway Agency.