US Bridges

Sc 641 over Willow Swamp

Good

Colleton County, South Carolina · 2.5 MI S of Lodge · Structure no. 000000000000518

Built
2018
7 years old
Condition
Good
inspected January 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
250 ft
5 main spans
Daily traffic
900
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 641 over Willow Swamp is a prestressed concrete box beam or girders - multiple carrying Sc 641 over Willow Swamp in Colleton County, South Carolina. It was built in 2018, so it is 7 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 900 vehicles a day, roughly 24% of them trucks, projected to reach 1,314 by 2043. The structure is 250 ft (76.2 m) long and 48 ft wide.

CarriesSc 641
CrossesWillow Swamp
Location2.5 MI S of Lodge
RouteState Highway 641
Coordinates33.02972, -80.95472
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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating40.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length250 ft (76.2 m)
Longest span50 ft (15.2 m)
Deck width48 ft (14.7 m)
Roadway width45 ft (13.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2023)
Projected traffic1,314 by 2043
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 641 over Willow Swamp built?

It was built in 2018, making it 7 years old in 2025.

What condition is Sc 641 over Willow Swamp 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 January 2024.

How much traffic does Sc 641 over Willow Swamp carry?

About 900 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is Sc 641 over Willow Swamp?

The structure is 250 ft (76.2 m) long with a longest span of 50 ft (15.2 m) and a deck 48 ft wide.

Who owns Sc 641 over Willow Swamp?

It is owned by the State Highway Agency.