US Bridges

S-12-16 over Mobley Creek

FairPosted for load

Chester County, South Carolina · 7.5 MI S Chester · Structure no. 000000000004725

Built
1966
59 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
425
2023 count
Owner
State
State Highway Agency

About this bridge

S-12-16 over Mobley Creek is a concrete slab carrying S-12-16 over Mobley Creek in Chester County, South Carolina. It was built in 1966, so it is 59 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 425 vehicles a day, roughly 13% of them trucks, projected to reach 621 by 2024. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesS-12-16
CrossesMobley Creek
Location7.5 MI S Chester
RouteState Highway 16
CountyChester County
StateSouth Carolina
Coordinates34.60417, -81.25056
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionFebruary 2025
Inspection intervalevery 12 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating30.8 US tons
Inventory rating18.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 10
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic425 (2023)
Projected traffic621 by 2024
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$299,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-12-16 over Mobley Creek built?

It was built in 1966, making it 59 years old in 2025.

What condition is S-12-16 over Mobley 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 February 2025.

How much traffic does S-12-16 over Mobley Creek carry?

About 425 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is S-12-16 over Mobley Creek?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-12-16 over Mobley Creek?

It is owned by the State Highway Agency.