US Bridges

Sc 30 over Ashley Riv & Wappoo Crk

Fair

Charleston County, South Carolina · In Charleston · Structure no. 000000000008617

Built
1993
32 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
11,297 ft
74 main spans
Daily traffic
61,400
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 30 over Ashley Riv & Wappoo Crk is a prestressed concrete continuous box beam or girders - single or spread carrying Sc 30 over Ashley Riv & Wappoo Crk 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 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 61,400 vehicles a day, roughly 3% of them trucks, projected to reach 168,236 by 2043. The structure is 11,297 ft (3,443.3 m) long and 85 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSc 30
CrossesAshley Riv & Wappoo Crk
LocationIn Charleston
RouteState Highway 30
CountyCharleston County
StateSouth Carolina
Coordinates32.7793, -79.95714
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.1 US tons
Inventory rating28.5 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans74 (+78 approach)
Design loadHS 20 + Mod
Structure length11,297 ft (3,443.3 m)
Longest span157 ft (47.9 m)
Deck width85 ft (26 m)
Roadway width67 ft (20.5 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic61,400 (2023)
Projected traffic168,236 by 2043
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.9 mi (3 km)
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—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Sc 30 over Ashley Riv & Wappoo Crk built?

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

What condition is Sc 30 over Ashley Riv & Wappoo Crk 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 February 2024.

How much traffic does Sc 30 over Ashley Riv & Wappoo Crk carry?

About 61,400 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Sc 30 over Ashley Riv & Wappoo Crk?

The structure is 11,297 ft (3,443.3 m) long with a longest span of 157 ft (47.9 m) and a deck 85 ft wide.

Who owns Sc 30 over Ashley Riv & Wappoo Crk?

It is owned by the State Highway Agency.