US Bridges

I-77 NB over Sc 48

Fair

Richland County, South Carolina · 4 MI S Columbia · Structure no. 000000000007730

Built
1983
42 years old, rebuilt 1987
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
240 ft
2 main spans
Daily traffic
47,350
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 NB over Sc 48 is a steel continuous stringer/multi-beam or girder carrying I-77 NB over Sc 48 in Richland County, South Carolina. It was built in 1983 and reconstructed in 1987, so it is 42 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 47,350 vehicles a day, roughly 16% of them trucks, projected to reach 58,714 by 2043. The structure is 240 ft (73.2 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-77 NB
CrossesSc 48
Location4 MI S Columbia
RouteInterstate 77
CountyRichland County
StateSouth Carolina
Coordinates33.95043, -80.99017
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.6 US tons
Inventory rating36.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length240 ft (73.2 m)
Longest span120 ft (36.6 m)
Deck width67 ft (20.5 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,350 (2023)
Projected traffic58,714 by 2043
Trucks16%
Lanes on structure4
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-77 NB over Sc 48 built?

It was built in 1983, making it 42 years old in 2025. It was reconstructed in 1987.

What condition is I-77 NB over Sc 48 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 January 2024.

How much traffic does I-77 NB over Sc 48 carry?

About 47,350 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-77 NB over Sc 48?

The structure is 240 ft (73.2 m) long with a longest span of 120 ft (36.6 m) and a deck 67 ft wide.

Who owns I-77 NB over Sc 48?

It is owned by the State Highway Agency.