US Bridges

US 178/E Main ST over Walnut Creek (no. 2)

Fair

Dorchester County, South Carolina · 5 MI S of Harleyvl · Structure no. 000000000000341

Built
1929
96 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
32 ft
3 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. 2) is a concrete culvert carrying US 178/E Main ST over Walnut Creek (no. 2) in Dorchester County, South Carolina. It was built in 1929, so it is 96 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 2,700 vehicles a day, roughly 14% of them trucks, projected to reach 4,293 by 2043. The structure is 32 ft (9.8 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesUS 178/E Main ST
CrossesWalnut Creek (no. 2)
Location5 MI S of Harleyvl
RouteU.S. Route 178
CountyDorchester County
StateSouth Carolina
Coordinates33.16263, -80.38657
Functional classRural Minor Arterial

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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.4 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width30 ft (9 m)
Roadway width28 ft (8.4 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 closed5 mi (8 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$104,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 178/E Main ST over Walnut Creek (no. 2) built?

It was built in 1929, making it 96 years old in 2025.

What condition is US 178/E Main ST over Walnut Creek (no. 2) 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 May 2024.

How much traffic does US 178/E Main ST over Walnut Creek (no. 2) 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. 2)?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 30 ft wide.

Who owns US 178/E Main ST over Walnut Creek (no. 2)?

It is owned by the State Highway Agency.