US Bridges

Ramp Off I-77 SB over Sc 161

Good

York County, South Carolina · 4.1 Miles N of Rock Hill · Structure no. 000000000009856

Built
2004
21 years old
Condition
Good
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
219 ft
3 main spans
Daily traffic
22,800
2022 count
Owner
State
State Highway Agency

About this bridge

Ramp Off I-77 SB over Sc 161 is a steel continuous stringer/multi-beam or girder carrying Ramp Off I-77 SB over Sc 161 in York County, South Carolina. It was built in 2004, so it is 21 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 22,800 vehicles a day, roughly 9% of them trucks, projected to reach 48,108 by 2042. The structure is 219 ft (66.9 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesRamp Off I-77 SB
CrossesSc 161
Location4.1 Miles N of Rock Hill
RouteInterstate 77
CountyYork County
StateSouth Carolina
Coordinates34.97682, -80.98832
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 rating63.6 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 length219 ft (66.9 m)
Longest span108 ft (32.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic22,800 (2022)
Projected traffic48,108 by 2042
Trucks9%
Lanes on structure1
Traffic directionOne-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 Off I-77 SB over Sc 161 built?

It was built in 2004, making it 21 years old in 2025.

What condition is Ramp Off I-77 SB 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 Off I-77 SB over Sc 161 carry?

About 22,800 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Ramp Off I-77 SB over Sc 161?

The structure is 219 ft (66.9 m) long with a longest span of 108 ft (32.8 m) and a deck 31 ft wide.

Who owns Ramp Off I-77 SB over Sc 161?

It is owned by the State Highway Agency.