US Bridges

US 378 over Whetstone Creek

Fair

Lexington County, South Carolina · 9 MI NW of Gilbert · Structure no. 000000000001091

Built
1940
85 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
10,800
2023 count
Owner
State
State Highway Agency

About this bridge

US 378 over Whetstone Creek is a concrete culvert carrying US 378 over Whetstone Creek in Lexington County, South Carolina. It was built in 1940, so it is 85 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 10,800 vehicles a day, roughly 9% of them trucks, projected to reach 17,280 by 2043. The structure is 25 ft (7.6 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 378
CrossesWhetstone Creek
Location9 MI NW of Gilbert
RouteU.S. Route 378
CountyLexington County
StateSouth Carolina
Coordinates34.03117, -81.48228
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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 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 rating43.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width50 ft (15.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,800 (2023)
Projected traffic17,280 by 2043
Trucks9%
Lanes on structure2
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 378 over Whetstone Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is US 378 over Whetstone Creek 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 Whetstone Creek carry?

About 10,800 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is US 378 over Whetstone Creek?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 50 ft wide.

Who owns US 378 over Whetstone Creek?

It is owned by the State Highway Agency.