Structure 1495 · Horry County, SC

US 17 Bus over Withers Swash

Carries US 17 Bus over Withers Swash, Town Of Myrtle Beach.

Overall conditionFair

Set by its lowest-rated component: Culvert at 5 of 9.

How ratings work
Culvertsets the rating5/9 · Fair
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT44 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 5/9

A culvert 44 ft across with 4 openings. Lengths and the car on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.

Built1948rebuilt 1977
Length44.3 ft13.5 m
Daily traffic32,900counted 2023
Last inspectedAugust 2024every 24 months

Location

StateSouth Carolina
CountyHorry
LocationTown Of Myrtle Beach
CarriesUS 17 Bus
CrossesWithers Swash
Coordinates33.68382, -78.89263

Physical Characteristics

MaterialConcrete Continuous
DesignCulvert
Total Length44.3 ft (13.5 m)
Max Span9.8 ft (3 m)
Deck Width101.4 ft (30.9 m)
Deck Area417.1 sq m
Main Spans4
Year Built1948 (reconstructed 1977)

Traffic

Avg Daily Traffic32,900 (2023)
Truck Traffic3%
Lanes On Bridge4

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000001495

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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