US Bridges

US 378 over Douglas Swamp

Fair

Clarendon County, South Carolina · 3MI E of Turbeville · Structure no. 000000000000852

Built
2007
18 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
135 ft
5 main spans
Daily traffic
5,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 378 over Douglas Swamp is a concrete continuous slab carrying US 378 over Douglas Swamp in Clarendon County, South Carolina. It was built in 2007, so it is 18 years old, younger 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 5,700 vehicles a day, roughly 12% of them trucks, projected to reach 9,918 by 2043. The structure is 135 ft (41.1 m) long and 90 ft wide.

Location

Open in Google Maps
CarriesUS 378
CrossesDouglas Swamp
Location3MI E of Turbeville
RouteU.S. Route 378
CountyClarendon County
StateSouth Carolina
Coordinates33.8885, -79.95806
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
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating50.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length135 ft (41.1 m)
Longest span35 ft (10.7 m)
Deck width90 ft (27.4 m)
Roadway width87 ft (26.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2023)
Projected traffic9,918 by 2043
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 US 378 over Douglas Swamp built?

It was built in 2007, making it 18 years old in 2025.

What condition is US 378 over Douglas Swamp 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 September 2023.

How much traffic does US 378 over Douglas Swamp carry?

About 5,700 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 378 over Douglas Swamp?

The structure is 135 ft (41.1 m) long with a longest span of 35 ft (10.7 m) and a deck 90 ft wide.

Who owns US 378 over Douglas Swamp?

It is owned by the State Highway Agency.