US Bridges

S-20-12 over Rocky Creek

Good

Fairfield County, South Carolina · 18MI W Winnsboro · Structure no. 000000000008253

Built
1989
36 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
150 ft
5 main spans
Daily traffic
425
2023 count
Owner
State
State Highway Agency

About this bridge

S-20-12 over Rocky Creek is a concrete continuous slab carrying S-20-12 over Rocky Creek in Fairfield County, South Carolina. It was built in 1989, so it is 36 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 425 vehicles a day, roughly 5% of them trucks, projected to reach 544 by 2043. The structure is 150 ft (45.7 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesS-20-12
CrossesRocky Creek
Location18MI W Winnsboro
RouteState Highway 12
Coordinates34.41917, -81.38928
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating53.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length150 ft (45.7 m)
Longest span30 ft (9.1 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic425 (2023)
Projected traffic544 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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-20-12 over Rocky Creek built?

It was built in 1989, making it 36 years old in 2025.

What condition is S-20-12 over Rocky Creek 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 April 2023.

How much traffic does S-20-12 over Rocky Creek carry?

About 425 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-20-12 over Rocky Creek?

The structure is 150 ft (45.7 m) long with a longest span of 30 ft (9.1 m) and a deck 37 ft wide.

Who owns S-20-12 over Rocky Creek?

It is owned by the State Highway Agency.