US Bridges

C-39-486 over Trib Eighteen Mile Creek

Good

Pickens County, South Carolina · 2.6 MI NE of Liberty · Structure no. 000000000010240

Built
2009
16 years old
Condition
Good
inspected April 2024
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
200
2023 count
Owner
County
County Highway Agency

About this bridge

C-39-486 over Trib Eighteen Mile Creek is a prestressed concrete slab carrying C-39-486 over Trib Eighteen Mile Creek in Pickens County, South Carolina. It was built in 2009, so it is 16 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 200 vehicles a day, roughly 4% of them trucks, projected to reach 256 by 2043. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesC-39-486
CrossesTrib Eighteen Mile Creek
Location2.6 MI NE of Liberty
RouteCounty Highway 486
Coordinates34.80068, -82.64865
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating91.4 US tons
Inventory rating47.2 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2023)
Projected traffic256 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 C-39-486 over Trib Eighteen Mile Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is C-39-486 over Trib Eighteen Mile Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does C-39-486 over Trib Eighteen Mile Creek carry?

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

How long is C-39-486 over Trib Eighteen Mile Creek?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns C-39-486 over Trib Eighteen Mile Creek?

It is owned by the County Highway Agency.