US Bridges

I-77 Ramps On/Off over Trib to Gills Creek

Good

Richland County, South Carolina · 5 MI S Columbia · Structure no. 000000000008031

Built
1986
39 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete
Length
29 ft
3 main spans
Daily traffic
94,700
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 Ramps On/Off over Trib to Gills Creek is a concrete culvert carrying I-77 Ramps On/Off over Trib to Gills Creek in Richland County, South Carolina. It was built in 1986, so it is 39 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 94,700 vehicles a day, roughly 16% of them trucks, projected to reach 117,428 by 2043. The structure is 29 ft (8.8 m) long and 150 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-77 Ramps On/Off
CrossesTrib to Gills Creek
Location5 MI S Columbia
RouteInterstate 77
Coordinates33.94972, -80.99361
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating106 US tons
Inventory rating63.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span8 ft (2.4 m)
Deck width150 ft (45.7 m)
Roadway width138 ft (42.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic94,700 (2023)
Projected traffic117,428 by 2043
Trucks16%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-77 Ramps On/Off over Trib to Gills Creek built?

It was built in 1986, making it 39 years old in 2025.

What condition is I-77 Ramps On/Off over Trib to Gills Creek 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 February 2024.

How much traffic does I-77 Ramps On/Off over Trib to Gills Creek carry?

About 94,700 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-77 Ramps On/Off over Trib to Gills Creek?

The structure is 29 ft (8.8 m) long with a longest span of 8 ft (2.4 m) and a deck 150 ft wide.

Who owns I-77 Ramps On/Off over Trib to Gills Creek?

It is owned by the State Highway Agency.