US Bridges

S-8-351 over Walker Swamp

Fair

Berkeley County, South Carolina · 3.5 MI NE Bonneau · Structure no. 000000000002667

Built
1958
67 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
56 ft
4 main spans
Daily traffic
850
2023 count
Owner
State
State Highway Agency

About this bridge

S-8-351 over Walker Swamp is a concrete slab carrying S-8-351 over Walker Swamp in Berkeley County, South Carolina. It was built in 1958, so it is 67 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 850 vehicles a day, roughly 3% of them trucks, projected to reach 1,241 by 2043. The structure is 56 ft (17.1 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesS-8-351
CrossesWalker Swamp
Location3.5 MI NE Bonneau
RouteState Highway 351
CountyBerkeley County
StateSouth Carolina
Coordinates33.34552, -79.91779
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 rating34.6 US tons
Inventory rating20.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans4
Design loadH 10
Structure length56 ft (17.1 m)
Longest span14 ft (4.3 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2023)
Projected traffic1,241 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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-8-351 over Walker Swamp built?

It was built in 1958, making it 67 years old in 2025.

What condition is S-8-351 over Walker 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 S-8-351 over Walker Swamp carry?

About 850 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S-8-351 over Walker Swamp?

The structure is 56 ft (17.1 m) long with a longest span of 14 ft (4.3 m) and a deck 26 ft wide.

Who owns S-8-351 over Walker Swamp?

It is owned by the State Highway Agency.