US Bridges

Sc 555 SB over I-77 & Ramps On/Off I-77

Fair

Richland County, South Carolina · 8.0 MI NE of Columbia · Structure no. 000000000006920

Built
1976
49 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
483 ft
4 main spans
Daily traffic
10,250
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 555 SB over I-77 & Ramps On/Off I-77 is a steel continuous stringer/multi-beam or girder carrying Sc 555 SB over I-77 & Ramps On/Off I-77 in Richland County, South Carolina. It was built in 1976, so it is 49 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 6 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 10,250 vehicles a day, roughly 3% of them trucks, projected to reach 13,838 by 2043. The structure is 483 ft (147.2 m) long and 51 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSc 555 SB
CrossesI-77 & Ramps On/Off I-77
Location8.0 MI NE of Columbia
RouteState Highway 555
CountyRichland County
StateSouth Carolina
Coordinates34.10042, -80.95867
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.3 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length483 ft (147.2 m)
Longest span138 ft (42.1 m)
Deck width51 ft (15.4 m)
Roadway width48 ft (14.5 m)
Vertical clearance over deck17 ft (5.3 m)

Traffic and service

Average daily traffic10,250 (2023)
Projected traffic13,838 by 2043
Trucks3%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sc 555 SB over I-77 & Ramps On/Off I-77 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Sc 555 SB over I-77 & Ramps On/Off 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 February 2024.

How much traffic does Sc 555 SB over I-77 & Ramps On/Off I-77 carry?

About 10,250 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Sc 555 SB over I-77 & Ramps On/Off I-77?

The structure is 483 ft (147.2 m) long with a longest span of 138 ft (42.1 m) and a deck 51 ft wide.

Who owns Sc 555 SB over I-77 & Ramps On/Off I-77?

It is owned by the State Highway Agency.