US Bridges

S-3-47 over Coosawhatchie River

Good

Allendale County, South Carolina · 3MI S Allendale · Structure no. 000000000002456

Built
2016
9 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
70 ft
1 main span
Daily traffic
225
2023 count
Owner
State
State Highway Agency

About this bridge

S-3-47 over Coosawhatchie River is a prestressed concrete box beam or girders - multiple carrying S-3-47 over Coosawhatchie River in Allendale County, South Carolina. It was built in 2016, so it is 9 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 225 vehicles a day, roughly 27% of them trucks, projected to reach 329 by 2043. The structure is 70 ft (21.3 m) long and 36 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

CarriesS-3-47
CrossesCoosawhatchie River
Location3MI S Allendale
RouteState Highway 47
Coordinates32.97221, -81.30564
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating70.8 US tons
Inventory rating54.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length70 ft (21.3 m)
Longest span70 ft (21.3 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic329 by 2043
Trucks27%
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 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-3-47 over Coosawhatchie River built?

It was built in 2016, making it 9 years old in 2025.

What condition is S-3-47 over Coosawhatchie River 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 2023.

How much traffic does S-3-47 over Coosawhatchie River carry?

About 225 vehicles per day (2023 count), of which roughly 27% are trucks.

How long is S-3-47 over Coosawhatchie River?

The structure is 70 ft (21.3 m) long with a longest span of 70 ft (21.3 m) and a deck 36 ft wide.

Who owns S-3-47 over Coosawhatchie River?

It is owned by the State Highway Agency.