Structure 7429 · Charleston County, SC

I-526 EB over Hobcaw Creek

Carries I-526 EB over Hobcaw Creek, Near Mt. Pleasant.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT385 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

385 ft end to end, longest span 35 ft: about 5 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.

Built1981rebuilt 1991
Length384.8 ft117.3 m
Daily traffic30,900counted 2023
Last inspectedJuly 2024every 24 months

Location

StateSouth Carolina
CountyCharleston
LocationNear Mt. Pleasant
CarriesI-526 EB
CrossesHobcaw Creek
Coordinates32.83397, -79.85373

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length384.8 ft (117.3 m)
Max Span35.1 ft (10.7 m)
Deck Width46.9 ft (14.3 m)
Deck Area1677.4 sq m
Main Spans11
Year Built1981 (reconstructed 1991)

Traffic

Avg Daily Traffic30,900 (2023)
Truck Traffic4%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000007429

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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