US Bridges

S-12-839 over Trib to Rocky CR

Good

Chester County, South Carolina · 8.9MI SE Chester · Structure no. 000000000004078

Built
2004
21 years old
Condition
Good
inspected December 2024
Type
Slab
Prestressed Concrete
Length
150 ft
3 main spans
Daily traffic
125
2023 count
Owner
State
State Highway Agency

About this bridge

S-12-839 over Trib to Rocky CR is a prestressed concrete slab carrying S-12-839 over Trib to Rocky CR in Chester County, South Carolina. It was built in 2004, so it is 21 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 125 vehicles a day, roughly 5% of them trucks, projected to reach 160 by 2043. The structure is 150 ft (45.7 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesS-12-839
CrossesTrib to Rocky CR
Location8.9MI SE Chester
RouteState Highway 839
Coordinates34.64907, -81.07282
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating46.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length150 ft (45.7 m)
Longest span50 ft (15.2 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2023)
Projected traffic160 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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-12-839 over Trib to Rocky CR built?

It was built in 2004, making it 21 years old in 2025.

What condition is S-12-839 over Trib to Rocky CR 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 December 2024.

How much traffic does S-12-839 over Trib to Rocky CR carry?

About 125 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-12-839 over Trib to Rocky CR?

The structure is 150 ft (45.7 m) long with a longest span of 50 ft (15.2 m) and a deck 33 ft wide.

Who owns S-12-839 over Trib to Rocky CR?

It is owned by the State Highway Agency.