US Bridges

Sc 277 NB over I-77

Good

Richland County, South Carolina · 7 MI N of Columbia · Structure no. 000000000010383

Built
2020
5 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
468 ft
2 main spans
Daily traffic
23,900
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 277 NB over I-77 is a steel continuous stringer/multi-beam or girder carrying Sc 277 NB over I-77 in Richland County, South Carolina. It was built in 2020, so it is 5 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 23,900 vehicles a day, roughly 10% of them trucks, projected to reach 30,353 by 2043. The structure is 468 ft (142.5 m) long and 54 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSc 277 NB
CrossesI-77
Location7 MI N of Columbia
RouteState Highway 277
CountyRichland County
StateSouth Carolina
Coordinates34.09361, -80.95444
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHL 93
Structure length468 ft (142.5 m)
Longest span232 ft (70.7 m)
Deck width54 ft (16.5 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,900 (2023)
Projected traffic30,353 by 2043
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sc 277 NB over I-77 built?

It was built in 2020, making it 5 years old in 2025.

What condition is Sc 277 NB over I-77 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2024.

How much traffic does Sc 277 NB over I-77 carry?

About 23,900 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Sc 277 NB over I-77?

The structure is 468 ft (142.5 m) long with a longest span of 232 ft (70.7 m) and a deck 54 ft wide.

Who owns Sc 277 NB over I-77?

It is owned by the State Highway Agency.