US Bridges

I-77 over Sc 161

Fair

York County, South Carolina · 4.4 MI N Rock Hill · Structure no. 000000000006394

Built
1973
52 years old, rebuilt 2000
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
220 ft
3 main spans
Daily traffic
74,500
2023 count
Owner
State
State Highway Agency

About this bridge

I-77 over Sc 161 is a steel continuous stringer/multi-beam or girder carrying I-77 over Sc 161 in York County, South Carolina. It was built in 1973 and reconstructed in 2000, so it is 52 years old, older 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 74,500 vehicles a day, roughly 14% of them trucks, projected to reach 104,300 by 2043. The structure is 220 ft (67 m) long and 134 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-77
CrossesSc 161
Location4.4 MI N Rock Hill
RouteInterstate 77
CountyYork County
StateSouth Carolina
Coordinates34.9768, -80.98802
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length220 ft (67 m)
Longest span108 ft (32.9 m)
Deck width134 ft (40.9 m)
Roadway width128 ft (39 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic74,500 (2023)
Projected traffic104,300 by 2043
Trucks14%
Lanes on structure8
Traffic directionTwo-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 over Sc 161 built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2000.

What condition is I-77 over Sc 161 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 over Sc 161 carry?

About 74,500 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is I-77 over Sc 161?

The structure is 220 ft (67 m) long with a longest span of 108 ft (32.9 m) and a deck 134 ft wide.

Who owns I-77 over Sc 161?

It is owned by the State Highway Agency.