US Bridges

US 178/E Main ST over Walnut Creek (no. 1)

Good

Dorchester County, South Carolina · 5 MI S of Harleyville · Structure no. 000000000000276

Built
1928
97 years old, rebuilt 1934
Condition
Good
inspected May 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
2,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 178/E Main ST over Walnut Creek (no. 1) is a concrete culvert carrying US 178/E Main ST over Walnut Creek (no. 1) in Dorchester County, South Carolina. It was built in 1928 and reconstructed in 1934, so it is 97 years old, older 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 2,700 vehicles a day, roughly 14% of them trucks, projected to reach 4,293 by 2043. The structure is 27 ft (8.2 m) long and 34 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesUS 178/E Main ST
CrossesWalnut Creek (no. 1)
Location5 MI S of Harleyville
RouteU.S. Route 178
CountyDorchester County
StateSouth Carolina
Coordinates33.16316, -80.38684
Functional classRural 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 rating45.3 US tons
Inventory rating27.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (2023)
Projected traffic4,293 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

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 178/E Main ST over Walnut Creek (no. 1) built?

It was built in 1928, making it 97 years old in 2025. It was reconstructed in 1934.

What condition is US 178/E Main ST over Walnut Creek (no. 1) 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 May 2024.

How much traffic does US 178/E Main ST over Walnut Creek (no. 1) carry?

About 2,700 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is US 178/E Main ST over Walnut Creek (no. 1)?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m) and a deck 34 ft wide.

Who owns US 178/E Main ST over Walnut Creek (no. 1)?

It is owned by the State Highway Agency.