US Bridges

S-15-18/LODGE HWY over Willow Swamp

Good

Colleton County, South Carolina · 20.5 MI NW Walterboro · Structure no. 000000000001618

Built
1949
76 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
175
2023 count
Owner
State
State Highway Agency

About this bridge

S-15-18/LODGE HWY over Willow Swamp is a concrete culvert carrying S-15-18/LODGE HWY over Willow Swamp in Colleton County, South Carolina. It was built in 1949, so it is 76 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 175 vehicles a day, roughly 23% of them trucks, projected to reach 243 by 2043. The structure is 21 ft (6.3 m) long and 32 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesS-15-18/LODGE HWY
CrossesWillow Swamp
Location20.5 MI NW Walterboro
RouteState Highway 18
Coordinates33.06035, -80.96555
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 rating45.7 US tons
Inventory rating35.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.3 m)
Longest span10 ft (3 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2023)
Projected traffic243 by 2043
Trucks23%
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-15-18/LODGE HWY over Willow Swamp built?

It was built in 1949, making it 76 years old in 2025.

What condition is S-15-18/LODGE HWY 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 March 2023.

How much traffic does S-15-18/LODGE HWY over Willow Swamp carry?

About 175 vehicles per day (2023 count), of which roughly 23% are trucks.

How long is S-15-18/LODGE HWY over Willow Swamp?

The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3 m) and a deck 32 ft wide.

Who owns S-15-18/LODGE HWY over Willow Swamp?

It is owned by the State Highway Agency.