US Bridges

I-77 NB over RR CSXT

Good

Richland County, South Carolina · 1.0 MI W of US 378 · Structure no. 000000000008198

Built
1988
37 years old
Condition
Good
inspected January 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
255 ft
3 main spans
Daily traffic
35,100
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 NB over RR CSXT is a steel stringer/multi-beam or girder carrying I-77 NB over RR CSXT in Richland County, South Carolina. It was built in 1988, so it is 37 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 35,100 vehicles a day, roughly 16% of them trucks, projected to reach 43,524 by 2043. The structure is 255 ft (77.7 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-77 NB
CrossesRR CSXT
Location1.0 MI W of US 378
RouteInterstate 77
Coordinates33.95497, -80.95803
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.6 US tons
Inventory rating57.5 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length255 ft (77.7 m)
Longest span85 ft (25.9 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,100 (2023)
Projected traffic43,524 by 2043
Trucks16%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate 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 I-77 NB over RR CSXT built?

It was built in 1988, making it 37 years old in 2025.

What condition is I-77 NB over RR CSXT 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 I-77 NB over RR CSXT carry?

About 35,100 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-77 NB over RR CSXT?

The structure is 255 ft (77.7 m) long with a longest span of 85 ft (25.9 m) and a deck 59 ft wide.

Who owns I-77 NB over RR CSXT?

It is owned by the State Highway Agency.