Structure 9932 · Charleston County, SC

US 78 EB over US 52

Carries US 78 EB over US 52, North Charleston.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT413 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

413 ft end to end, longest span 240 ft: about 6 semi-trucks nose to tail. Lengths and the semi-truck 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 or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built200323 years old
Length413.1 ft125.9 m
Daily traffic24,650counted 2023
Last inspectedJune 2024every 24 months

Location

StateSouth Carolina
CountyCharleston
LocationNorth Charleston
CarriesUS 78 EB
CrossesUS 52
Coordinates32.97094, -80.04574

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length413.1 ft (125.9 m)
Max Span240.5 ft (73.3 m)
Deck Width30.8 ft (9.4 m)
Deck Area1183.5 sq m
Main Spans2
Year Built2003

Traffic

Avg Daily Traffic24,650 (2023)
Truck Traffic2%
Lanes On Bridge3
Lanes Under Bridge7

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000009932

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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