US Bridges

US 321 over RR NS

Poor

York County, South Carolina · 0.1 MI S York · Structure no. 000000000002438

Built
1956
69 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
160 ft
3 main spans
Daily traffic
6,400
2023 count
Owner
State
State Highway Agency

About this bridge

US 321 over RR NS is a steel stringer/multi-beam or girder carrying US 321 over RR NS in York County, South Carolina. It was built in 1956, so it is 69 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 6,400 vehicles a day, roughly 10% of them trucks, projected to reach 9,024 by 2025. The structure is 160 ft (48.8 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 321
CrossesRR NS
Location0.1 MI S York
RouteU.S. Route 321
CountyYork County
StateSouth Carolina
Coordinates34.97972, -81.24639
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment7: Better than present minimum criteria
Operating rating45.3 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length160 ft (48.8 m)
Longest span60 ft (18.3 m)
Deck width37 ft (11.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2023)
Projected traffic9,024 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$546,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 321 over RR NS built?

It was built in 1956, making it 69 years old in 2025.

What condition is US 321 over RR NS in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does US 321 over RR NS carry?

About 6,400 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 321 over RR NS?

The structure is 160 ft (48.8 m) long with a longest span of 60 ft (18.3 m) and a deck 37 ft wide.

Who owns US 321 over RR NS?

It is owned by the State Highway Agency.