I-526 EB over US 17

Charleston County, South Carolina · rated Good in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

I-526 EB over US 17 in Charleston County, South Carolina, is rated in good condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
It was built in 1991, making it 34 years old at the 2025 inventory.
It carries about 15,350 vehicles a day (traffic count year 2024).
Its listed owner is the state highway agency.
It is one of 141 of the 339 inventoried bridges in Charleston County rated good (41.6%); 9 (2.7%) are rated poor.
A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 269 ft
Location	In Mt. Pleasant
NBI structure number	000000000008421
Condition class	Good

Source: FHWA National Bridge Inventory, 2025 data as reported by the South Carolina department of transportation.

Bridge	Built	Vehicles/day	Condition
I-26 over RR NS Spur & Taylor St	1964	170,100	Fair
I-26 over Goose Creek	1960	109,600	Fair
I-26 over RR Csxt	1963	94,100	Poor
US 17 over RR Csxt & US 52 Bus	2005	94,100	Fair
US 17 over Marsh	2005	94,100	Good
US 17 over Cooper River Town Creek	2005	94,100	Good