US Bridges

I-77 SB over Sc 34

Good

Fairfield County, South Carolina · 2.0 MI W of Ridgeway · Structure no. 000000000007109

Built
1978
47 years old, rebuilt 1999
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
180 ft
3 main spans
Daily traffic
24,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 SB over Sc 34 is a steel stringer/multi-beam or girder carrying I-77 SB over Sc 34 in Fairfield County, South Carolina. It was built in 1978 and reconstructed in 1999, so it is 47 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 24,450 vehicles a day, roughly 22% of them trucks, projected to reach 46,944 by 2043. The structure is 180 ft (54.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-77 SB
CrossesSc 34
Location2.0 MI W of Ridgeway
RouteInterstate 77
Coordinates34.30789, -81.00022
Functional classRural 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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.3 US tons
Inventory rating38.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length180 ft (54.9 m)
Longest span114 ft (34.7 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,450 (2023)
Projected traffic46,944 by 2043
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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 SB over Sc 34 built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 1999.

What condition is I-77 SB over Sc 34 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 June 2024.

How much traffic does I-77 SB over Sc 34 carry?

About 24,450 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is I-77 SB over Sc 34?

The structure is 180 ft (54.9 m) long with a longest span of 114 ft (34.7 m) and a deck 44 ft wide.

Who owns I-77 SB over Sc 34?

It is owned by the State Highway Agency.