US Bridges

S-31-378 over Trib Lynches River

Good

Lee County, South Carolina · 2 MI E of Bishopville · Structure no. 000000000007707

Built
1983
42 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
100
2023 count
Owner
State
State Highway Agency

About this bridge

S-31-378 over Trib Lynches River is a prestressed concrete stringer/multi-beam or girder carrying S-31-378 over Trib Lynches River in Lee County, South Carolina. It was built in 1983, so it is 42 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 100 vehicles a day, roughly 5% of them trucks, projected to reach 128 by 2043. The structure is 30 ft (9.1 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS-31-378
CrossesTrib Lynches River
Location2 MI E of Bishopville
RouteState Highway 378
Coordinates34.22662, -80.2227
Functional classRural Local

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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating87.2 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic128 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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-31-378 over Trib Lynches River built?

It was built in 1983, making it 42 years old in 2025.

What condition is S-31-378 over Trib Lynches River 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 2023.

How much traffic does S-31-378 over Trib Lynches River carry?

About 100 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-31-378 over Trib Lynches River?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 34 ft wide.

Who owns S-31-378 over Trib Lynches River?

It is owned by the State Highway Agency.