US Bridges

Ramp Off I-77 SB over I-20/RAMP Off I-20 EB

Good

Richland County, South Carolina · 8 MI NE of Columbia · Structure no. 000000000007933

Built
1985
40 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
318 ft
3 main spans
Daily traffic
11,450
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp Off I-77 SB over I-20/RAMP Off I-20 EB is a steel continuous stringer/multi-beam or girder carrying Ramp Off I-77 SB over I-20/RAMP Off I-20 EB in Richland County, South Carolina. It was built in 1985, so it is 40 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 11,450 vehicles a day, roughly 9% of them trucks, projected to reach 24,160 by 2043. The structure is 318 ft (96.9 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRamp Off I-77 SB
CrossesI-20/RAMP Off I-20 EB
Location8 MI NE of Columbia
RouteInterstate 77
CountyRichland County
StateSouth Carolina
Coordinates34.06781, -80.92468
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 geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating41.1 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20 + Mod
Structure length318 ft (96.9 m)
Longest span80 ft (24.4 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,450 (2023)
Projected traffic24,160 by 2043
Trucks9%
Lanes on structure1
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp Off I-77 SB over I-20/RAMP Off I-20 EB built?

It was built in 1985, making it 40 years old in 2025.

What condition is Ramp Off I-77 SB over I-20/RAMP Off I-20 EB 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 SB over I-20/RAMP Off I-20 EB carry?

About 11,450 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Ramp Off I-77 SB over I-20/RAMP Off I-20 EB?

The structure is 318 ft (96.9 m) long with a longest span of 80 ft (24.4 m) and a deck 31 ft wide.

Who owns Ramp Off I-77 SB over I-20/RAMP Off I-20 EB?

It is owned by the State Highway Agency.