US Bridges

Ramp Off I-26 EB over US 78/KING Street

Fair

Charleston County, South Carolina · In Charleston · Structure no. 000000000005476

Built
1969
56 years old, rebuilt 2005
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,048 ft
2 main spans
Daily traffic
30,450
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp Off I-26 EB over US 78/KING Street is a steel continuous stringer/multi-beam or girder carrying Ramp Off I-26 EB over US 78/KING Street in Charleston County, South Carolina. It was built in 1969 and reconstructed in 2005, so it is 56 years old, older 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 30,450 vehicles a day, roughly 9% of them trucks, projected to reach 46,893 by 2043. The structure is 1,048 ft (319.4 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesRamp Off I-26 EB
CrossesUS 78/KING Street
LocationIn Charleston
RouteInterstate 26
CountyCharleston County
StateSouth Carolina
Coordinates32.79732, -79.94351
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating24.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+14 approach)
Design loadHS 20
Structure length1,048 ft (319.4 m)
Longest span89 ft (27.1 m)
Deck width41 ft (12.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,450 (2023)
Projected traffic46,893 by 2043
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$3.2 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp Off I-26 EB over US 78/KING Street built?

It was built in 1969, making it 56 years old in 2025. It was reconstructed in 2005.

What condition is Ramp Off I-26 EB over US 78/KING Street 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 Ramp Off I-26 EB over US 78/KING Street carry?

About 30,450 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Ramp Off I-26 EB over US 78/KING Street?

The structure is 1,048 ft (319.4 m) long with a longest span of 89 ft (27.1 m) and a deck 41 ft wide.

Who owns Ramp Off I-26 EB over US 78/KING Street?

It is owned by the State Highway Agency.