US Bridges

Ramp On/Off I-77NB over Sc 161

Good

York County, South Carolina · 4.1 Miles N of Rock Hill · Structure no. 000000000009855

Built
2003
22 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
220 ft
3 main spans
Daily traffic
8,300
2022 count
Owner
State
State Highway Agency

About this bridge

Ramp On/Off I-77NB over Sc 161 is a steel continuous stringer/multi-beam or girder carrying Ramp On/Off I-77NB over Sc 161 in York County, South Carolina. It was built in 2003, so it is 22 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 8,300 vehicles a day, roughly 9% of them trucks, projected to reach 17,513 by 2042. The structure is 220 ft (67.1 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRamp On/Off I-77NB
CrossesSc 161
Location4.1 Miles N of Rock Hill
RouteInterstate 77
CountyYork County
StateSouth Carolina
Coordinates34.97683, -80.98769
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.
Superstructure8 Very GoodNo problems noted.
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 rating75.4 US tons
Inventory rating45 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 (67.1 m)
Longest span108 ft (32.9 m)
Deck width43 ft (13.1 m)
Roadway width39 ft (12 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic8,300 (2022)
Projected traffic17,513 by 2042
Trucks9%
Lanes on structure2
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 Ramp On/Off I-77NB over Sc 161 built?

It was built in 2003, making it 22 years old in 2025.

What condition is Ramp On/Off I-77NB over Sc 161 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 March 2024.

How much traffic does Ramp On/Off I-77NB over Sc 161 carry?

About 8,300 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Ramp On/Off I-77NB over Sc 161?

The structure is 220 ft (67.1 m) long with a longest span of 108 ft (32.9 m) and a deck 43 ft wide.

Who owns Ramp On/Off I-77NB over Sc 161?

It is owned by the State Highway Agency.