US Bridges

S-20-30 over I-77

Fair

Fairfield County, South Carolina · 8.5 MI SE Winnsboro · Structure no. 000000000006973

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
293 ft
4 main spans
Daily traffic
1,300
2023 count
Owner
State
State Highway Agency

About this bridge

S-20-30 over I-77 is a steel stringer/multi-beam or girder carrying S-20-30 over I-77 in Fairfield County, South Carolina. It was built in 1977, so it is 48 years old, younger 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 1,300 vehicles a day, roughly 7% of them trucks, projected to reach 1,898 by 2043. The structure is 293 ft (89.3 m) long and 37 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS-20-30
CrossesI-77
Location8.5 MI SE Winnsboro
RouteState Highway 30
CountyFairfield County
StateSouth Carolina
Coordinates34.28253, -80.99739
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating35.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length293 ft (89.3 m)
Longest span107 ft (32.6 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2023)
Projected traffic1,898 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was S-20-30 over I-77 built?

It was built in 1977, making it 48 years old in 2025.

What condition is S-20-30 over I-77 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 2023.

How much traffic does S-20-30 over I-77 carry?

About 1,300 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-20-30 over I-77?

The structure is 293 ft (89.3 m) long with a longest span of 107 ft (32.6 m) and a deck 37 ft wide.

Who owns S-20-30 over I-77?

It is owned by the State Highway Agency.