US Bridges

Ramp Off I-77 NB over Ramp on I-77 NB

Good

Richland County, South Carolina · 5 MI SE of Columbia · Structure no. 000000000008480

Built
1991
34 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
228 ft
4 main spans
Daily traffic
8,300
2022 count
Owner
State
State Highway Agency

About this bridge

Ramp Off I-77 NB over Ramp on I-77 NB is a steel stringer/multi-beam or girder carrying Ramp Off I-77 NB over Ramp on I-77 NB in Richland County, South Carolina. It was built in 1991, so it is 34 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,300 vehicles a day, roughly 9% of them trucks, projected to reach 17,513 by 2042. The structure is 228 ft (69.5 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesRamp Off I-77 NB
CrossesRamp on I-77 NB
Location5 MI SE of Columbia
RouteInterstate 77
CountyRichland County
StateSouth Carolina
Coordinates33.97492, -80.95444
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating85.3 US tons
Inventory rating66 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length228 ft (69.5 m)
Longest span88 ft (26.9 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,300 (2022)
Projected traffic17,513 by 2042
Trucks9%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Ramp Off I-77 NB over Ramp on I-77 NB built?

It was built in 1991, making it 34 years old in 2025.

What condition is Ramp Off I-77 NB over Ramp on I-77 NB 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 January 2024.

How much traffic does Ramp Off I-77 NB over Ramp on I-77 NB carry?

About 8,300 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Ramp Off I-77 NB over Ramp on I-77 NB?

The structure is 228 ft (69.5 m) long with a longest span of 88 ft (26.9 m) and a deck 30 ft wide.

Who owns Ramp Off I-77 NB over Ramp on I-77 NB?

It is owned by the State Highway Agency.