Structure 1296 · Orangeburg County, SC

US 15 over Four Hole Swamp

Carries US 15 over Four Hole Swamp, 4 Mi SW Of Holly Hill.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT210 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

210 ft end to end, longest span 30 ft: about 3 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 slab bridge.

Built200620 years old
Length210.0 ft64 m
Daily traffic850counted 2023
Last inspectedDecember 2023every 24 months

Location

StateSouth Carolina
CountyOrangeburg
Location4 Mi SW Of Holly Hill
CarriesUS 15
CrossesFour Hole Swamp
Coordinates33.30348, -80.49179

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length210.0 ft (64 m)
Max Span29.9 ft (9.1 m)
Deck Width47.2 ft (14.4 m)
Deck Area921.6 sq m
Main Spans7
Year Built2006

Traffic

Avg Daily Traffic850 (2023)
Truck Traffic11%
Lanes On Bridge2

Inspection & Ownership

Last InspectionDecember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number000000000001296

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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