US Bridges

S-46-50 over US 21

Fair

York County, South Carolina · 3.3 MI E Rock Hill · Structure no. 000000000004681

Built
1965
60 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
220 ft
4 main spans
Daily traffic
2,600
2023 count
Owner
State
State Highway Agency

About this bridge

S-46-50 over US 21 is a steel stringer/multi-beam or girder carrying S-46-50 over US 21 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 2,600 vehicles a day, roughly 7% of them trucks, projected to reach 3,458 by 2043. The structure is 220 ft (67.1 m) long and 32 ft wide.

Location

Open in Google Maps
CarriesS-46-50
CrossesUS 21
Location3.3 MI E Rock Hill
RouteState Highway 50
CountyYork County
StateSouth Carolina
Coordinates34.91164, -80.96827
Functional classUrban Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length220 ft (67.1 m)
Longest span55 ft (16.8 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2023)
Projected traffic3,458 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

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 S-46-50 over US 21 built?

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

What condition is S-46-50 over US 21 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 January 2025.

How much traffic does S-46-50 over US 21 carry?

About 2,600 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-46-50 over US 21?

The structure is 220 ft (67.1 m) long with a longest span of 55 ft (16.8 m) and a deck 32 ft wide.

Who owns S-46-50 over US 21?

It is owned by the State Highway Agency.