US Bridges

Ramp On&off I-526 over US 17

Good

Charleston County, South Carolina · Town of Mount Pleasant · Structure no. 000000000010118

Built
2013
12 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
763 ft
4 main spans
Daily traffic
8,600
2022 count
Owner
State
State Highway Agency

About this bridge

Ramp On&off I-526 over US 17 is a steel continuous stringer/multi-beam or girder carrying Ramp On&off I-526 over US 17 in Charleston County, South Carolina. It was built in 2013, so it is 12 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 8,600 vehicles a day, roughly 9% of them trucks, projected to reach 11,524 by 2042. The structure is 763 ft (232.6 m) long and 58 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesRamp On&off I-526
CrossesUS 17
LocationTown of Mount Pleasant
RouteInterstate 526
CountyCharleston County
StateSouth Carolina
Coordinates32.81948, -79.84343
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.1 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length763 ft (232.6 m)
Longest span250 ft (76.2 m)
Deck width58 ft (17.6 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,600 (2022)
Projected traffic11,524 by 2042
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.2 mi (10 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ramp On&off I-526 over US 17 built?

It was built in 2013, making it 12 years old in 2025.

What condition is Ramp On&off I-526 over US 17 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 December 2023.

How much traffic does Ramp On&off I-526 over US 17 carry?

About 8,600 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is Ramp On&off I-526 over US 17?

The structure is 763 ft (232.6 m) long with a longest span of 250 ft (76.2 m) and a deck 58 ft wide.

Who owns Ramp On&off I-526 over US 17?

It is owned by the State Highway Agency.