US Bridges

Ramp on I-26 WB over Ramp Off I-26 EB & US 78

Fair

Charleston County, South Carolina · In Charleston · Structure no. 000000000005477

Built
1969
56 years old, rebuilt 2005
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,069 ft
17 main spans
Daily traffic
30,450
2023 count
Owner
State
State Highway Agency

About this bridge

Ramp on I-26 WB over Ramp Off I-26 EB & US 78 is a prestressed concrete stringer/multi-beam or girder carrying Ramp on I-26 WB over Ramp Off I-26 EB & US 78 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 5 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 1,069 ft (325.9 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesRamp on I-26 WB
CrossesRamp Off I-26 EB & US 78
LocationIn Charleston
RouteInterstate 26
Coordinates32.79682, -79.94244
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be 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 rating61.4 US tons
Inventory rating20.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans17
Design loadHS 20 + Mod
Structure length1,069 ft (325.9 m)
Longest span86 ft (26.2 m)
Deck width67 ft (20.4 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,450 (2023)
Projected traffic46,893 by 2043
Trucks9%
Lanes on structure4
Traffic directionTwo-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$347,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp on I-26 WB over Ramp Off I-26 EB & US 78 built?

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

What condition is Ramp on I-26 WB over Ramp Off I-26 EB & US 78 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 on I-26 WB over Ramp Off I-26 EB & US 78 carry?

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

How long is Ramp on I-26 WB over Ramp Off I-26 EB & US 78?

The structure is 1,069 ft (325.9 m) long with a longest span of 86 ft (26.2 m) and a deck 67 ft wide.

Who owns Ramp on I-26 WB over Ramp Off I-26 EB & US 78?

It is owned by the State Highway Agency.