US Bridges

I-77 NB over Congaree Creek

Good

Lexington County, South Carolina · 4 MI S of Columbia · Structure no. 000000000007912

Built
1985
40 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,440 ft
1 main span
Daily traffic
47,350
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 NB over Congaree Creek is a steel stringer/multi-beam or girder carrying I-77 NB over Congaree Creek in Lexington 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 47,350 vehicles a day, roughly 16% of them trucks, projected to reach 61,082 by 2043. The structure is 1,440 ft (438.9 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-77 NB
CrossesCongaree Creek
Location4 MI S of Columbia
RouteInterstate 77
CountyLexington County
StateSouth Carolina
Coordinates33.92826, -81.0272
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.5 US tons
Inventory rating36.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+45 approach)
Design loadHS 20 + Mod
Structure length1,440 ft (438.9 m)
Longest span90 ft (27.4 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,350 (2023)
Projected traffic61,082 by 2043
Trucks16%
Lanes on structure3
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-77 NB over Congaree Creek built?

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

What condition is I-77 NB over Congaree 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 November 2023.

How much traffic does I-77 NB over Congaree Creek carry?

About 47,350 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-77 NB over Congaree Creek?

The structure is 1,440 ft (438.9 m) long with a longest span of 90 ft (27.4 m) and a deck 59 ft wide.

Who owns I-77 NB over Congaree Creek?

It is owned by the State Highway Agency.