US Bridges

S-26-31 over Waccamaw Swamp

Good

Horry County, South Carolina · 10 MI S Loris · Structure no. 000000000003331

Built
2015
10 years old
Condition
Good
inspected June 2023
Type
Slab
Concrete Continuous
Length
80 ft
2 main spans
Daily traffic
6,400
2023 count
Owner
State
State Highway Agency

About this bridge

S-26-31 over Waccamaw Swamp is a concrete continuous slab carrying S-26-31 over Waccamaw Swamp in Horry County, South Carolina. It was built in 2015, so it is 10 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 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 6,400 vehicles a day, roughly 5% of them trucks, projected to reach 6,464 by 2043. The structure is 80 ft (24.4 m) long and 43 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesS-26-31
CrossesWaccamaw Swamp
Location10 MI S Loris
RouteState Highway 31
CountyHorry County
StateSouth Carolina
Coordinates33.8758, -78.82761
Functional classRural Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.2 US tons
Inventory rating22.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span40 ft (12.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2023)
Projected traffic6,464 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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-26-31 over Waccamaw Swamp built?

It was built in 2015, making it 10 years old in 2025.

What condition is S-26-31 over Waccamaw 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 June 2023.

How much traffic does S-26-31 over Waccamaw Swamp carry?

About 6,400 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-26-31 over Waccamaw Swamp?

The structure is 80 ft (24.4 m) long with a longest span of 40 ft (12.2 m) and a deck 43 ft wide.

Who owns S-26-31 over Waccamaw Swamp?

It is owned by the State Highway Agency.