US Bridges

L-9343 over Gapway Swamp

FairPosted for load

Horry County, South Carolina · 6 MI W of State Line · Structure no. 000000000009984

Built
1968
57 years old
Condition
Fair
inspected November 2023
Type
Channel Beam
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
275
2023 count
Owner
County
County Highway Agency

About this bridge

L-9343 over Gapway Swamp is a prestressed concrete channel beam carrying L-9343 over Gapway Swamp in Horry County, South Carolina. It was built in 1968, so it is 57 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 275 vehicles a day, roughly 8% of them trucks, projected to reach 382 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesL-9343
CrossesGapway Swamp
Location6 MI W of State Line
RouteCounty Highway 9343
Coordinates34.25185, -79.09057
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.2 US tons
Inventory rating19.6 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1 (+1 approach)
Design loadH 10
Structure length45 ft (13.7 m)
Longest span30 ft (9.1 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic275 (2023)
Projected traffic382 by 2043
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$101,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was L-9343 over Gapway Swamp built?

It was built in 1968, making it 57 years old in 2025.

What condition is L-9343 over Gapway Swamp in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in November 2023.

How much traffic does L-9343 over Gapway Swamp carry?

About 275 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is L-9343 over Gapway Swamp?

The structure is 45 ft (13.7 m) long with a longest span of 30 ft (9.1 m) and a deck 28 ft wide.

Who owns L-9343 over Gapway Swamp?

It is owned by the County Highway Agency.