US Bridges

S-18-28 over Little Walnut Branch

Fair

Dorchester County, South Carolina · 12.7 MI E ST George · Structure no. 000000000006283

Built
1973
52 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete
Length
105 ft
7 main spans
Daily traffic
275
2023 count
Owner
State
State Highway Agency

About this bridge

S-18-28 over Little Walnut Branch is a concrete slab carrying S-18-28 over Little Walnut Branch in Dorchester County, South Carolina. It was built in 1973, so it is 52 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 275 vehicles a day, roughly 25% of them trucks, projected to reach 382 by 2043. The structure is 105 ft (32 m) long and 28 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesS-18-28
CrossesLittle Walnut Branch
Location12.7 MI E ST George
RouteState Highway 28
CountyDorchester County
StateSouth Carolina
Coordinates33.15215, -80.35798
Functional classRural Minor 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 protection8 Very GoodNo problems noted.
Last inspectionMay 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 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 rating32.2 US tons
Inventory rating19.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans7
Design loadH 10
Structure length105 ft (32 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2023)
Projected traffic382 by 2043
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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-18-28 over Little Walnut Branch built?

It was built in 1973, making it 52 years old in 2025.

What condition is S-18-28 over Little Walnut Branch 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 2023.

How much traffic does S-18-28 over Little Walnut Branch carry?

About 275 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is S-18-28 over Little Walnut Branch?

The structure is 105 ft (32 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-18-28 over Little Walnut Branch?

It is owned by the State Highway Agency.