Structure 10629 · Charleston County, SC

S-11 over Marsh

Carries S-11 over Marsh, 1.5 Mi SE Of N Charleston.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructure8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,041 FT OVERALL200 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 7/9 · sets the ratingSubstructure 8/9

1,041 ft end to end, longest span 40 ft: about 2.9 football fields. 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 slab bridge.

Built20215 years old
Length1041.0 ft317.3 m
Daily traffic5,600counted 2023
Last inspectedAugust 2023every 24 months

Location

StateSouth Carolina
CountyCharleston
Location1.5 Mi SE Of N Charleston
CarriesS-11
CrossesMarsh
Coordinates32.84394, -79.95369

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length1041.0 ft (317.3 m)
Max Span40.0 ft (12.2 m)
Deck Width88.3 ft (26.9 m)
Deck Area8535.4 sq m
Main Spans27
Year Built2021

Traffic

Avg Daily Traffic5,600 (2023)
Truck Traffic6%
Lanes On Bridge4

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000010629

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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