US Bridges

Ramp Off Sc 30 EB over Marsh

Good

Charleston County, South Carolina · In Charleston · Structure no. 000000000008619

Built
1993
32 years old
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
581 ft
4 main spans
Daily traffic
3,500
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp Off Sc 30 EB over Marsh is a prestressed concrete continuous box beam or girders - single or spread carrying Ramp Off Sc 30 EB over Marsh in Charleston County, South Carolina. It was built in 1993, so it is 32 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 3,500 vehicles a day, projected to reach 5,670 by 2043. The structure is 581 ft (177.1 m) long and 29 ft wide.

Location

Open in Google Maps
CarriesRamp Off Sc 30 EB
CrossesMarsh
LocationIn Charleston
RouteState Highway 30
CountyCharleston County
StateSouth Carolina
Coordinates32.78197, -79.95363
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating32.2 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4 (+5 approach)
Design loadHS 20 + Mod
Structure length581 ft (177.1 m)
Longest span121 ft (36.9 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,500 (2023)
Projected traffic5,670 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 Ramp Off Sc 30 EB over Marsh built?

It was built in 1993, making it 32 years old in 2025.

What condition is Ramp Off Sc 30 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 July 2024.

How much traffic does Ramp Off Sc 30 EB over Marsh carry?

About 3,500 vehicles per day (2023 count).

How long is Ramp Off Sc 30 EB over Marsh?

The structure is 581 ft (177.1 m) long with a longest span of 121 ft (36.9 m) and a deck 29 ft wide.

Who owns Ramp Off Sc 30 EB over Marsh?

It is owned by the State Highway Agency.