US Bridges

S-4-280 over Three & Twenty Creek

Good

Anderson County, South Carolina · 9.5MI NW Anderson · Structure no. 000000000006422

Built
2016
9 years old
Condition
Good
inspected December 2024
Type
Slab
Concrete
Length
180 ft
3 main spans
Daily traffic
1,550
2023 count
Owner
State
State Highway Agency

About this bridge

S-4-280 over Three & Twenty Creek is a concrete slab carrying S-4-280 over Three & Twenty Creek in Anderson County, South Carolina. It was built in 2016, so it is 9 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 1,550 vehicles a day, roughly 8% of them trucks, projected to reach 1,907 by 2043. The structure is 180 ft (54.9 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesS-4-280
CrossesThree & Twenty Creek
Location9.5MI NW Anderson
RouteState Highway 280
Coordinates34.5999, -82.77209
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length180 ft (54.9 m)
Longest span80 ft (24.4 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,550 (2023)
Projected traffic1,907 by 2043
Trucks8%
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-4-280 over Three & Twenty Creek built?

It was built in 2016, making it 9 years old in 2025.

What condition is S-4-280 over Three & Twenty 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 December 2024.

How much traffic does S-4-280 over Three & Twenty Creek carry?

About 1,550 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is S-4-280 over Three & Twenty Creek?

The structure is 180 ft (54.9 m) long with a longest span of 80 ft (24.4 m) and a deck 36 ft wide.

Who owns S-4-280 over Three & Twenty Creek?

It is owned by the State Highway Agency.