US Bridges

S-20-54 over Mills Creek

FairPosted for load

Fairfield County, South Carolina · 6MI SW Winnsboro · Structure no. 000000000002170

Built
1955
70 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
84 ft
6 main spans
Daily traffic
250
2023 count
Owner
State
State Highway Agency

About this bridge

S-20-54 over Mills Creek is a concrete slab carrying S-20-54 over Mills Creek in Fairfield County, South Carolina. It was built in 1955, so it is 70 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 250 vehicles a day, roughly 8% of them trucks, projected to reach 365 by 2043. The structure is 84 ft (25.6 m) long and 26 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesS-20-54
CrossesMills Creek
Location6MI SW Winnsboro
RouteState Highway 54
CountyFairfield County
StateSouth Carolina
Coordinates34.34254, -81.17659
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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating19 US tons
Inventory rating11 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans6
Design loadH 10
Structure length84 ft (25.6 m)
Longest span14 ft (4.4 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2023)
Projected traffic365 by 2043
Trucks8%
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$446,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-20-54 over Mills Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is S-20-54 over Mills 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 April 2024.

How much traffic does S-20-54 over Mills Creek carry?

About 250 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is S-20-54 over Mills Creek?

The structure is 84 ft (25.6 m) long with a longest span of 14 ft (4.4 m) and a deck 26 ft wide.

Who owns S-20-54 over Mills Creek?

It is owned by the State Highway Agency.