US Bridges

S-39-64 over Eighteen Mile Creek

PoorPosted for load

Pickens County, South Carolina · 2.0 MI SE Liberty · Structure no. 000000000007153

Built
1978
47 years old
Condition
Poor
inspected December 2024
Type
Channel Beam
Prestressed Concrete
Length
90 ft
3 main spans
Daily traffic
750
2023 count
Owner
State
State Highway Agency

About this bridge

S-39-64 over Eighteen Mile Creek is a prestressed concrete channel beam carrying S-39-64 over Eighteen Mile Creek in Pickens County, South Carolina. It was built in 1978, so it is 47 years old, younger 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 750 vehicles a day, roughly 7% of them trucks, projected to reach 960 by 2043. The structure is 90 ft (27.4 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-39-64
CrossesEighteen Mile Creek
Location2.0 MI SE Liberty
RouteState Highway 64
Coordinates34.7668, -82.67326
Functional classRural Local

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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating17.9 US tons
Inventory rating7.2 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length90 ft (27.4 m)
Longest span30 ft (9.1 m)
Deck width33 ft (10.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2023)
Projected traffic960 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$540,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-39-64 over Eighteen Mile Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is S-39-64 over Eighteen Mile Creek 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 December 2024.

How much traffic does S-39-64 over Eighteen Mile Creek carry?

About 750 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-39-64 over Eighteen Mile Creek?

The structure is 90 ft (27.4 m) long with a longest span of 30 ft (9.1 m) and a deck 33 ft wide.

Who owns S-39-64 over Eighteen Mile Creek?

It is owned by the State Highway Agency.