US Bridges

US 378 over Br of Lynches Lake

Fair

Florence County, South Carolina · 3MI NW of Lake City · Structure no. 000000000000861

Built
1938
87 years old, rebuilt 1998
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
5,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 378 over Br of Lynches Lake is a concrete culvert carrying US 378 over Br of Lynches Lake in Florence County, South Carolina. It was built in 1938 and reconstructed in 1998, so it is 87 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 5 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 5,700 vehicles a day, roughly 15% of them trucks, projected to reach 9,918 by 2043. The structure is 32 ft (9.8 m) long and 79 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 378
CrossesBr of Lynches Lake
Location3MI NW of Lake City
RouteU.S. Route 378
CountyFlorence County
StateSouth Carolina
Coordinates33.88783, -79.80113
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 20
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width79 ft (24.1 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2023)
Projected traffic9,918 by 2043
Trucks15%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 US 378 over Br of Lynches Lake built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1998.

What condition is US 378 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 June 2023.

How much traffic does US 378 over Br of Lynches Lake carry?

About 5,700 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is US 378 over Br of Lynches Lake?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 79 ft wide.

Who owns US 378 over Br of Lynches Lake?

It is owned by the State Highway Agency.