US Bridges

Ramp Off I-77 SB over Ramp on I-77 SB

Fair

Richland County, South Carolina · 7 MI N of Columbia · Structure no. 000000000007159

Built
1976
49 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
223 ft
3 main spans
Daily traffic
23,900
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp Off I-77 SB over Ramp on I-77 SB is a steel stringer/multi-beam or girder carrying Ramp Off I-77 SB over Ramp on I-77 SB in Richland County, South Carolina. It was built in 1976, so it is 49 years old, older 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 6 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 23,900 vehicles a day, roughly 10% of them trucks, projected to reach 56,165 by 2043. The structure is 223 ft (68 m) long and 55 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
CrossesRamp on I-77 SB
Location7 MI N of Columbia
RouteState Highway 277
CountyRichland County
StateSouth Carolina
Coordinates34.09401, -80.95559
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.4 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length223 ft (68 m)
Longest span107 ft (32.6 m)
Deck width55 ft (16.7 m)
Roadway width52 ft (15.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,900 (2023)
Projected traffic56,165 by 2043
Trucks10%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
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 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 Ramp on I-77 SB built?

It was built in 1976, making it 49 years old in 2025.

What condition is Ramp Off I-77 SB over Ramp on I-77 SB 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 February 2024.

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

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

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

The structure is 223 ft (68 m) long with a longest span of 107 ft (32.6 m) and a deck 55 ft wide.

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

It is owned by the State Highway Agency.