US Bridges

Ramp Off I-77 NB over I-77

Good

Richland County, South Carolina · 6 MI NE of Columbia · Structure no. 000000000008661

Built
1993
32 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
377 ft
4 main spans
Daily traffic
6,000
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp Off I-77 NB over I-77 is a steel continuous stringer/multi-beam or girder carrying Ramp Off I-77 NB over I-77 in Richland County, South Carolina. It was built in 1993, so it is 32 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 6,000 vehicles a day, roughly 9% of them trucks, projected to reach 12,660 by 2043. The structure is 377 ft (114.9 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRamp Off I-77 NB
CrossesI-77
Location6 MI NE of Columbia
RouteInterstate 77
CountyRichland County
StateSouth Carolina
Coordinates34.04101, -80.93657
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.5 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length377 ft (114.9 m)
Longest span112 ft (34.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2023)
Projected traffic12,660 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ramp Off I-77 NB over I-77 built?

It was built in 1993, making it 32 years old in 2025.

What condition is Ramp Off I-77 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 January 2024.

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

About 6,000 vehicles per day (2023 count), of which roughly 9% are trucks.

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

The structure is 377 ft (114.9 m) long with a longest span of 112 ft (34.1 m) and a deck 43 ft wide.

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

It is owned by the State Highway Agency.