US Bridges

Sc 421 over Sou. Railroad

PoorPosted for load

Aiken County, South Carolina · 1 MI E of Clearwater · Structure no. 000000000002286

Built
1956
69 years old, rebuilt 1972
Condition
Poor
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
190 ft
5 main spans
Daily traffic
9,000
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 421 over Sou. Railroad is a steel stringer/multi-beam or girder carrying Sc 421 over Sou. Railroad in Aiken County, South Carolina. It was built in 1956 and reconstructed in 1972, 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. Its operating status is: posted for load restriction.

It carries about 9,000 vehicles a day, roughly 4% of them trucks, projected to reach 9,270 by 2043. The structure is 190 ft (57.9 m) long and 57 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSc 421
CrossesSou. Railroad
Location1 MI E of Clearwater
RouteState Highway 421
Coordinates33.50061, -81.8783
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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 6 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.9 US tons
Inventory rating23.3 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length190 ft (57.9 m)
Longest span38 ft (11.6 m)
Deck width57 ft (17.4 m)
Roadway width46 ft (14 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,000 (2023)
Projected traffic9,270 by 2043
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed3.1 mi (5 km)
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.3 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sc 421 over Sou. Railroad built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1972.

What condition is Sc 421 over Sou. Railroad 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 August 2024.

How much traffic does Sc 421 over Sou. Railroad carry?

About 9,000 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Sc 421 over Sou. Railroad?

The structure is 190 ft (57.9 m) long with a longest span of 38 ft (11.6 m) and a deck 57 ft wide.

Who owns Sc 421 over Sou. Railroad?

It is owned by the State Highway Agency.