US Bridges

Sc 20 over Big Creek

Fair

Anderson County, South Carolina · Williamston Town Limits · Structure no. 000000000000379

Built
1930
95 years old
Condition
Fair
inspected December 2023
Type
Tee Beam
Concrete
Length
150 ft
6 main spans
Daily traffic
12,400
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 20 over Big Creek is a concrete tee beam carrying Sc 20 over Big Creek in Anderson County, South Carolina. It was built in 1930, so it is 95 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.

It carries about 12,400 vehicles a day, roughly 5% of them trucks, projected to reach 13,640 by 2043. The structure is 150 ft (45.7 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSc 20
CrossesBig Creek
LocationWilliamston Town Limits
RouteState Highway 20
CountyAnderson County
StateSouth Carolina
Coordinates34.61769, -82.48081
Functional classUrban Minor Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length150 ft (45.7 m)
Longest span25 ft (7.6 m)
Deck width40 ft (12.3 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,400 (2023)
Projected traffic13,640 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$512,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 20 over Big Creek built?

It was built in 1930, making it 95 years old in 2025.

What condition is Sc 20 over Big 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 December 2023.

How much traffic does Sc 20 over Big Creek carry?

About 12,400 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Sc 20 over Big Creek?

The structure is 150 ft (45.7 m) long with a longest span of 25 ft (7.6 m) and a deck 40 ft wide.

Who owns Sc 20 over Big Creek?

It is owned by the State Highway Agency.