US Bridges

S-20-46 over Swaneys Creek

Good

Fairfield County, South Carolina · 13MI SE Winnsboro · Structure no. 000000000008834

Built
1995
30 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
1 main span
Daily traffic
225
2023 count
Owner
State
State Highway Agency

About this bridge

S-20-46 over Swaneys Creek is a prestressed concrete stringer/multi-beam or girder carrying S-20-46 over Swaneys Creek in Fairfield County, South Carolina. It was built in 1995, so it is 30 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 225 vehicles a day, roughly 8% of them trucks, projected to reach 329 by 2043. The structure is 120 ft (36.6 m) long and 37 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesS-20-46
CrossesSwaneys Creek
Location13MI SE Winnsboro
RouteState Highway 46
Coordinates34.29168, -80.88422
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating42.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1 (+2 approach)
Design loadHS 25 or greater
Structure length120 ft (36.6 m)
Longest span50 ft (15.2 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic329 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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-20-46 over Swaneys Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is S-20-46 over Swaneys 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 May 2023.

How much traffic does S-20-46 over Swaneys Creek carry?

About 225 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is S-20-46 over Swaneys Creek?

The structure is 120 ft (36.6 m) long with a longest span of 50 ft (15.2 m) and a deck 37 ft wide.

Who owns S-20-46 over Swaneys Creek?

It is owned by the State Highway Agency.