US Bridges

S-12-138 over Big Rocky CR

FairPosted for load

Chester County, South Carolina · 1.8MI SW Great Falls · Structure no. 000000000005242

Built
1968
57 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
225 ft
2 main spans
Daily traffic
500
2023 count
Owner
State
State Highway Agency

About this bridge

S-12-138 over Big Rocky CR is a steel continuous stringer/multi-beam or girder carrying S-12-138 over Big Rocky CR in Chester County, South Carolina. It was built in 1968, so it is 57 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 500 vehicles a day, roughly 7% of them trucks, projected to reach 695 by 2043. The structure is 225 ft (68.6 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS-12-138
CrossesBig Rocky CR
Location1.8MI SW Great Falls
RouteState Highway 138
CountyChester County
StateSouth Carolina
Coordinates34.56947, -80.93075
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating40.3 US tons
Inventory rating24.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, precast panels
Main spans2 (+9 approach)
Design loadH 15
Structure length225 ft (68.6 m)
Longest span45 ft (13.7 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2023)
Projected traffic695 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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-12-138 over Big Rocky CR built?

It was built in 1968, making it 57 years old in 2025.

What condition is S-12-138 over Big Rocky CR 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 March 2024.

How much traffic does S-12-138 over Big Rocky CR carry?

About 500 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-12-138 over Big Rocky CR?

The structure is 225 ft (68.6 m) long with a longest span of 45 ft (13.7 m) and a deck 28 ft wide.

Who owns S-12-138 over Big Rocky CR?

It is owned by the State Highway Agency.