US Bridges

I-77 SB over Rocky Creek

Fair

Chester County, South Carolina · 1.5 MI North of Sc 97 · Structure no. 000000000007214

Built
1979
46 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
390 ft
6 main spans
Daily traffic
24,350
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 SB over Rocky Creek is a prestressed concrete stringer/multi-beam or girder carrying I-77 SB over Rocky Creek in Chester 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 24,350 vehicles a day, roughly 22% of them trucks, projected to reach 46,752 by 2043. The structure is 390 ft (118.9 m) long and 44 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI-77 SB
CrossesRocky Creek
Location1.5 MI North of Sc 97
RouteInterstate 77
CountyChester County
StateSouth Carolina
Coordinates34.63047, -81.02488
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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length390 ft (118.9 m)
Longest span65 ft (19.8 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,350 (2023)
Projected traffic46,752 by 2043
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 SB over Rocky Creek built?

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

What condition is I-77 SB over Rocky Creek 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 March 2024.

How much traffic does I-77 SB over Rocky Creek carry?

About 24,350 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is I-77 SB over Rocky Creek?

The structure is 390 ft (118.9 m) long with a longest span of 65 ft (19.8 m) and a deck 44 ft wide.

Who owns I-77 SB over Rocky Creek?

It is owned by the State Highway Agency.