US Bridges

S-13-399 over North Prong Creek

Fair

Chesterfield County, South Carolina · 5.6 MI SW Chesterfield · Structure no. 000000000008431

Built
1991
34 years old
Condition
Fair
inspected December 2024
Type
Channel Beam
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
200
2023 count
Owner
State
State Highway Agency

About this bridge

S-13-399 over North Prong Creek is a prestressed concrete channel beam carrying S-13-399 over North Prong Creek in Chesterfield County, South Carolina. It was built in 1991, so it is 34 years old, younger 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 5 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 200 vehicles a day, roughly 5% of them trucks, projected to reach 292 by 2024. The structure is 30 ft (9.1 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesS-13-399
CrossesNorth Prong Creek
Location5.6 MI SW Chesterfield
RouteState Highway 399
Coordinates34.68611, -80.16417
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.4 US tons
Inventory rating45 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width34 ft (10.3 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic292 by 2024
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 S-13-399 over North Prong Creek built?

It was built in 1991, making it 34 years old in 2025.

What condition is S-13-399 over North Prong Creek 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 December 2024.

How much traffic does S-13-399 over North Prong Creek carry?

About 200 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-13-399 over North Prong Creek?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 34 ft wide.

Who owns S-13-399 over North Prong Creek?

It is owned by the State Highway Agency.