US Bridges

S-23-21 over NS RR

Fair

Greenville County, South Carolina · 3.3MI NE Greenville · Structure no. 000000000003305

Built
1960
65 years old, rebuilt 1987
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
101 ft
1 main span
Daily traffic
16,200
2023 count
Owner
State
State Highway Agency

About this bridge

S-23-21 over NS RR is a steel stringer/multi-beam or girder carrying S-23-21 over NS RR in Greenville County, South Carolina. It was built in 1960 and reconstructed in 1987, so it is 65 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 6 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 16,200 vehicles a day, roughly 4% of them trucks, projected to reach 20,574 by 2043. The structure is 101 ft (30.9 m) long and 76 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS-23-21
CrossesNS RR
Location3.3MI NE Greenville
RouteState Highway 21
Coordinates34.89404, -82.36936
Functional classUrban Minor 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating46.1 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length101 ft (30.9 m)
Longest span98 ft (29.9 m)
Deck width76 ft (23.3 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,200 (2023)
Projected traffic20,574 by 2043
Trucks4%
Lanes on structure5
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 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-23-21 over NS RR built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1987.

What condition is S-23-21 over NS RR 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 2023.

How much traffic does S-23-21 over NS RR carry?

About 16,200 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is S-23-21 over NS RR?

The structure is 101 ft (30.9 m) long with a longest span of 98 ft (29.9 m) and a deck 76 ft wide.

Who owns S-23-21 over NS RR?

It is owned by the State Highway Agency.