Structure 10408 · Dorchester County, SC

US 15 over Indian Field Swamp

Carries US 15 over Indian Field Swamp, 4.5 Mi N Of ST George.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 8 of 9.

How ratings work
Decksets the rating8/9 · Very Good
Superstructuresets the rating8/9 · Very Good
Substructuresets the rating8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT114 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 8/9

114 ft end to end, longest span 38 ft. 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 or the layout of the shorter spans, so those are drawn as typical for a slab bridge.

Built20206 years old
Length113.8 ft34.7 m
Daily traffic3,500counted 2023
Last inspectedApril 2024every 24 months

Location

StateSouth Carolina
CountyDorchester
Location4.5 Mi N Of ST George
CarriesUS 15
CrossesIndian Field Swamp
Coordinates33.22970, -80.53979

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length113.8 ft (34.7 m)
Max Span38.1 ft (11.6 m)
Deck Width45.9 ft (14 m)
Deck Area485.8 sq m
Main Spans3
Year Built2020

Traffic

Avg Daily Traffic3,500 (2023)
Truck Traffic9%
Lanes On Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number000000000010408

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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