US Bridges

US 21 SB over Sc 5

Fair

York County, South Carolina · 6.4 MI S of Rock Hill · Structure no. 000000000004679

Built
1965
60 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
201 ft
3 main spans
Daily traffic
12,100
2023 count
Owner
State
State Highway Agency

About this bridge

US 21 SB over Sc 5 is a steel stringer/multi-beam or girder carrying US 21 SB over Sc 5 in York County, South Carolina. It was built in 1965, so it is 60 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 12,100 vehicles a day, roughly 8% of them trucks, projected to reach 15,851 by 2043. The structure is 201 ft (61.3 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesUS 21 SB
CrossesSc 5
Location6.4 MI S of Rock Hill
RouteU.S. Route 21
CountyYork County
StateSouth Carolina
Coordinates34.87218, -80.93193
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length201 ft (61.3 m)
Longest span77 ft (23.5 m)
Deck width40 ft (12.1 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,100 (2023)
Projected traffic15,851 by 2043
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 US 21 SB over Sc 5 built?

It was built in 1965, making it 60 years old in 2025.

What condition is US 21 SB over Sc 5 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 US 21 SB over Sc 5 carry?

About 12,100 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is US 21 SB over Sc 5?

The structure is 201 ft (61.3 m) long with a longest span of 77 ft (23.5 m) and a deck 40 ft wide.

Who owns US 21 SB over Sc 5?

It is owned by the State Highway Agency.