US Bridges

I-77 Nbl over Big Wateree Ck

Fair

Fairfield County, South Carolina · 1.4 MI S of Sc 200 · Structure no. 000000000007249

Built
1979
46 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
280 ft
1 main span
Daily traffic
24,300
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 Nbl over Big Wateree Ck is a prestressed concrete stringer/multi-beam or girder carrying I-77 Nbl over Big Wateree Ck in Fairfield County, South Carolina. It was built in 1979, so it is 46 years old, younger 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 5 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 24,300 vehicles a day, roughly 18% of them trucks, projected to reach 46,656 by 2043. The structure is 280 ft (85.3 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesI-77 Nbl
CrossesBig Wateree Ck
Location1.4 MI S of Sc 200
RouteInterstate 77
Coordinates34.48996, -80.99578
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating38.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+7 approach)
Design loadHS 20
Structure length280 ft (85.3 m)
Longest span70 ft (21.3 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,300 (2023)
Projected traffic46,656 by 2043
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Nbl over Big Wateree Ck built?

It was built in 1979, making it 46 years old in 2025.

What condition is I-77 Nbl over Big Wateree Ck 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 June 2024.

How much traffic does I-77 Nbl over Big Wateree Ck carry?

About 24,300 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is I-77 Nbl over Big Wateree Ck?

The structure is 280 ft (85.3 m) long with a longest span of 70 ft (21.3 m) and a deck 44 ft wide.

Who owns I-77 Nbl over Big Wateree Ck?

It is owned by the State Highway Agency.