US Bridges

Sc 18 over Pacolet River

Fair

Union County, South Carolina · Cherokee CO LN · Structure no. 000000000000640

Built
1933
92 years old, rebuilt 1977
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
736 ft
2 main spans
Daily traffic
750
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 18 over Pacolet River is a prestressed concrete stringer/multi-beam or girder carrying Sc 18 over Pacolet River in Union County, South Carolina. It was built in 1933 and reconstructed in 1977, so it is 92 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 750 vehicles a day, roughly 11% of them trucks, projected to reach 1,193 by 2043. The structure is 736 ft (224.3 m) long and 47 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesSc 18
CrossesPacolet River
LocationCherokee CO LN
RouteState Highway 18
Coordinates34.8798, -81.63803
Functional classRural 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating11.5 US tons
Inventory rating6.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2 (+11 approach)
Design loadH 15
Structure length736 ft (224.3 m)
Longest span76 ft (23.2 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2023)
Projected traffic1,193 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$3.5 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 18 over Pacolet River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1977.

What condition is Sc 18 over Pacolet River 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 2024.

How much traffic does Sc 18 over Pacolet River carry?

About 750 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Sc 18 over Pacolet River?

The structure is 736 ft (224.3 m) long with a longest span of 76 ft (23.2 m) and a deck 47 ft wide.

Who owns Sc 18 over Pacolet River?

It is owned by the State Highway Agency.