US Bridges

I-526 EB over Marsh

Good

Berkeley County, South Carolina · Near Charleston · Structure no. 000000000008227

Built
1989
36 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete Continuous
Length
390 ft
13 main spans
Daily traffic
33,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-526 EB over Marsh is a concrete continuous slab carrying I-526 EB over Marsh in Berkeley County, South Carolina. It was built in 1989, so it is 36 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 33,450 vehicles a day, roughly 12% of them trucks, projected to reach 46,496 by 2043. The structure is 390 ft (118.9 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-526 EB
CrossesMarsh
LocationNear Charleston
RouteInterstate 526
Coordinates32.87695, -79.92877
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.7 US tons
Inventory rating43.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans13
Design loadHS 20
Structure length390 ft (118.9 m)
Longest span30 ft (9.1 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,450 (2023)
Projected traffic46,496 by 2043
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-526 EB over Marsh built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-526 EB over Marsh in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does I-526 EB over Marsh carry?

About 33,450 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is I-526 EB over Marsh?

The structure is 390 ft (118.9 m) long with a longest span of 30 ft (9.1 m) and a deck 47 ft wide.

Who owns I-526 EB over Marsh?

It is owned by the State Highway Agency.