US Bridges

I-526 EB over US 17

Good

Charleston County, South Carolina · In Mt. Pleasant · Structure no. 000000000008421

Built
1991
34 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
269 ft
3 main spans
Daily traffic
15,350
2024 count
Owner
State
State Highway Agency

About this bridge

I-526 EB over US 17 is a steel stringer/multi-beam or girder carrying I-526 EB over US 17 in Charleston County, South Carolina. It was built in 1991, so it is 34 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 15,350 vehicles a day, roughly 5% of them trucks, projected to reach 21,337 by 2044. The structure is 269 ft (82 m) long and 55 ft wide.

CarriesI-526 EB
CrossesUS 17
LocationIn Mt. Pleasant
RouteInterstate 526
Coordinates32.81421, -79.84965
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2024
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 alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating46.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length269 ft (82 m)
Longest span168 ft (51.2 m)
Deck width55 ft (16.7 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,350 (2024)
Projected traffic21,337 by 2044
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-526 EB over US 17 built?

It was built in 1991, making it 34 years old in 2025.

What condition is I-526 EB 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 August 2024.

How much traffic does I-526 EB over US 17 carry?

About 15,350 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is I-526 EB over US 17?

The structure is 269 ft (82 m) long with a longest span of 168 ft (51.2 m) and a deck 55 ft wide.

Who owns I-526 EB over US 17?

It is owned by the State Highway Agency.