US Bridges

I-526WB/RAMPON526 over S-56/MATHIS Ferry RD

Fair

Charleston County, South Carolina · Near Mt. Pleasant · Structure no. 000000000007431

Built
1990
35 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
161 ft
3 main spans
Daily traffic
20,750
2023 count
Owner
State
State Highway Agency

About this bridge

I-526WB/RAMPON526 over S-56/MATHIS Ferry RD is a steel stringer/multi-beam or girder carrying I-526WB/RAMPON526 over S-56/MATHIS Ferry RD in Charleston County, South Carolina. It was built in 1990, so it is 35 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 20,750 vehicles a day, roughly 4% of them trucks, projected to reach 28,843 by 2043. The structure is 161 ft (49.1 m) long and 66 ft wide.

Location

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CarriesI-526WB/RAMPON526
CrossesS-56/MATHIS Ferry RD
LocationNear Mt. Pleasant
RouteInterstate 526
CountyCharleston County
StateSouth Carolina
Coordinates32.82373, -79.84958
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length161 ft (49.1 m)
Longest span71 ft (21.6 m)
Deck width66 ft (20.2 m)
Roadway width63 ft (19.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,750 (2023)
Projected traffic28,843 by 2043
Trucks4%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-526WB/RAMPON526 over S-56/MATHIS Ferry RD built?

It was built in 1990, making it 35 years old in 2025.

What condition is I-526WB/RAMPON526 over S-56/MATHIS Ferry RD in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does I-526WB/RAMPON526 over S-56/MATHIS Ferry RD carry?

About 20,750 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is I-526WB/RAMPON526 over S-56/MATHIS Ferry RD?

The structure is 161 ft (49.1 m) long with a longest span of 71 ft (21.6 m) and a deck 66 ft wide.

Who owns I-526WB/RAMPON526 over S-56/MATHIS Ferry RD?

It is owned by the State Highway Agency.