Structure 6695 · Horry County, SC

Sc 90 over Tilly Swamp

Carries Sc 90 over Tilly Swamp, 9.5mi E Of Conway.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT101 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

101 ft end to end, longest span 25 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.

Built1974rebuilt 2000
Length101.0 ft30.8 m
Daily traffic16,500counted 2023
Last inspectedSeptember 2024every 24 months

Location

StateSouth Carolina
CountyHorry
Location9.5mi E Of Conway
CarriesSc 90
CrossesTilly Swamp
Coordinates33.83316, -78.88564

Physical Characteristics

MaterialConcrete
DesignSlab
Total Length101.0 ft (30.8 m)
Max Span24.9 ft (7.6 m)
Deck Width47.6 ft (14.5 m)
Deck Area446.6 sq m
Main Spans4
Year Built1974 (reconstructed 2000)

Traffic

Avg Daily Traffic16,500 (2023)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number000000000006695

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.

Nearby Bridges