US Bridges

Sc 18 over B.U.C. Railroad

Fair

Union County, South Carolina · City of Union · Structure no. 000000000000754

Built
1936
89 years old
Condition
Fair
inspected September 2023
Type
Tee Beam
Concrete
Length
90 ft
3 main spans
Daily traffic
4,700
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 18 over B.U.C. Railroad is a concrete tee beam carrying Sc 18 over B.U.C. Railroad in Union County, South Carolina. It was built in 1936, so it is 89 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 4,700 vehicles a day, roughly 11% of them trucks, projected to reach 6,627 by 2043. The structure is 90 ft (27.4 m) long and 49 ft wide.

Location

Open in Google Maps
CarriesSc 18
CrossesB.U.C. Railroad
LocationCity of Union
RouteState Highway 18
CountyUnion County
StateSouth Carolina
Coordinates34.72014, -81.62515
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.7 US tons
Inventory rating39.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length90 ft (27.4 m)
Longest span30 ft (9.1 m)
Deck width49 ft (14.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2023)
Projected traffic6,627 by 2043
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sc 18 over B.U.C. Railroad built?

It was built in 1936, making it 89 years old in 2025.

What condition is Sc 18 over B.U.C. Railroad 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 September 2023.

How much traffic does Sc 18 over B.U.C. Railroad carry?

About 4,700 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Sc 18 over B.U.C. Railroad?

The structure is 90 ft (27.4 m) long with a longest span of 30 ft (9.1 m) and a deck 49 ft wide.

Who owns Sc 18 over B.U.C. Railroad?

It is owned by the State Highway Agency.