US Bridges

Ramp Off Sc 30 WB over Marsh

Fair

Charleston County, South Carolina · Charleston · Structure no. 000000000008971

Built
1996
29 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
1,010 ft
7 main spans
Daily traffic
6,731
2014 count
Owner
State
State Highway Agency

About this bridge

Ramp Off Sc 30 WB over Marsh is a prestressed concrete continuous box beam or girders - single or spread carrying Ramp Off Sc 30 WB over Marsh in Charleston County, South Carolina. It was built in 1996, so it is 29 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 6,731 vehicles a day, projected to reach 10,904 by 2034. The structure is 1,010 ft (307.9 m) long and 29 ft wide.

Location

Open in Google Maps
CarriesRamp Off Sc 30 WB
CrossesMarsh
LocationCharleston
RouteState Highway 30
CountyCharleston County
StateSouth Carolina
Coordinates32.77677, -79.95904
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.5 US tons
Inventory rating23.3 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans7 (+7 approach)
Design loadHS 20 + Mod
Structure length1,010 ft (307.9 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 traffic6,731 (2014)
Projected traffic10,904 by 2034
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp Off Sc 30 WB over Marsh built?

It was built in 1996, making it 29 years old in 2025.

What condition is Ramp Off Sc 30 WB over Marsh 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 July 2024.

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

About 6,731 vehicles per day (2014 count).

How long is Ramp Off Sc 30 WB over Marsh?

The structure is 1,010 ft (307.9 m) long with a longest span of 121 ft (36.9 m) and a deck 29 ft wide.

Who owns Ramp Off Sc 30 WB over Marsh?

It is owned by the State Highway Agency.