US Bridges

C-12-546 over Mountain Lakes

FairPosted for load

Chester County, South Carolina · 4.2 MI SW Chester · Structure no. 000000000003223

Built
1960
65 years old, rebuilt 1990
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
50
2023 count
Owner
County
County Highway Agency

About this bridge

C-12-546 over Mountain Lakes is a prestressed concrete stringer/multi-beam or girder carrying C-12-546 over Mountain Lakes in Chester County, South Carolina. It was built in 1960 and reconstructed in 1990, so it is 65 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 50 vehicles a day, projected to reach 70 by 2024. The structure is 60 ft (18.3 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesC-12-546
CrossesMountain Lakes
Location4.2 MI SW Chester
RouteCounty Highway 546
CountyChester County
StateSouth Carolina
Coordinates34.66417, -81.26556
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.3 US tons
Inventory rating8.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1 (+2 approach)
Design loadH 10
Structure length60 ft (18.3 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.4 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2023)
Projected traffic70 by 2024
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$306,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was C-12-546 over Mountain Lakes built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1990.

What condition is C-12-546 over Mountain Lakes 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 April 2024.

How much traffic does C-12-546 over Mountain Lakes carry?

About 50 vehicles per day (2023 count).

How long is C-12-546 over Mountain Lakes?

The structure is 60 ft (18.3 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns C-12-546 over Mountain Lakes?

It is owned by the County Highway Agency.