US Bridges

US 17 Bus over Withers Swash

Fair

Horry County, South Carolina · Town of Myrtle Beach · Structure no. 000000000001495

Built
1948
77 years old, rebuilt 1977
Condition
Fair
inspected August 2024
Type
Culvert
Concrete Continuous
Length
44 ft
4 main spans
Daily traffic
32,900
2023 count
Owner
State
State Highway Agency

About this bridge

US 17 Bus over Withers Swash is a concrete continuous culvert carrying US 17 Bus over Withers Swash in Horry County, South Carolina. It was built in 1948 and reconstructed in 1977, so it is 77 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.

It carries about 32,900 vehicles a day, roughly 3% of them trucks, projected to reach 41,125 by 2043. The structure is 44 ft (13.5 m) long and 101 ft wide.

CarriesUS 17 Bus
CrossesWithers Swash
LocationTown of Myrtle Beach
RouteU.S. Route 17
Coordinates33.68382, -78.89263
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.2 US tons
Inventory rating67.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadH 15
Structure length44 ft (13.5 m)
Longest span10 ft (3 m)
Deck width101 ft (30.9 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,900 (2023)
Projected traffic41,125 by 2043
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 US 17 Bus over Withers Swash built?

It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1977.

What condition is US 17 Bus over Withers Swash 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 August 2024.

How much traffic does US 17 Bus over Withers Swash carry?

About 32,900 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is US 17 Bus over Withers Swash?

The structure is 44 ft (13.5 m) long with a longest span of 10 ft (3 m) and a deck 101 ft wide.

Who owns US 17 Bus over Withers Swash?

It is owned by the State Highway Agency.