US Bridges

S-22-318 over Six Mile Creek

Fair

Georgetown County, South Carolina · 6MI N Georgetown · Structure no. 000000000006670

Built
1975
50 years old, rebuilt 1999
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
1,550
2023 count
Owner
State
State Highway Agency

About this bridge

S-22-318 over Six Mile Creek is a concrete slab carrying S-22-318 over Six Mile Creek in Georgetown County, South Carolina. It was built in 1975 and reconstructed in 1999, so it is 50 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 1,550 vehicles a day, roughly 11% of them trucks, projected to reach 2,263 by 2043. The structure is 45 ft (13.7 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesS-22-318
CrossesSix Mile Creek
Location6MI N Georgetown
RouteState Highway 318
Coordinates33.47302, -79.36396
Functional classRural Major Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,550 (2023)
Projected traffic2,263 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-22-318 over Six Mile Creek built?

It was built in 1975, making it 50 years old in 2025. It was reconstructed in 1999.

What condition is S-22-318 over Six Mile Creek 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 April 2023.

How much traffic does S-22-318 over Six Mile Creek carry?

About 1,550 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is S-22-318 over Six Mile Creek?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 33 ft wide.

Who owns S-22-318 over Six Mile Creek?

It is owned by the State Highway Agency.