Bridge conditions in Charleston County, South Carolina
339 inventoried bridges · 9 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 339 bridges in Charleston County: 141 rated good, 189 fair, and 9 poor.
- 9 of the 339 bridges in Charleston County, South Carolina, are rated in poor condition (2.7%) in the 2025 National Bridge Inventory, as of .
- 141 bridges (41.6%) are rated good and 189 (55.8%) fair.
- The median Charleston County bridge was built in 1992.
- The busiest poor-rated bridge is I-26 over RR Csxt (built 1963), carrying about 94,100 vehicles a day.
Good 41.6% · Fair 55.8% · Poor 2.7% of 339 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-26 over RR Csxt | 1963 | 94,100 | Poor |
| Sc 7 over Ashley River | 1953 | 47,800 | Poor |
| US 17 NB over Ashley River | 1961 | 38,250 | Poor |
| Sc 703 over Shem Creek | 1947 | 37,500 | Poor |
| S-10-97 over Tidal Stream | 1972 | 18,100 | Poor |
| S-390/toogoodoo Rd over Swinton Creek | 1975 | 1,750 | Poor |
| S-1632/old Pond Rd over Simons Creek | 1969 | 1,450 | Poor |
| S-10-40 over RR Csxt | 1927 | 750 | Poor |
| S-10-98 over Guerin Creek | 1974 | 350 | Poor |
Busiest bridges in the county
| 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 |
| I-26 EB over S.C.642 | 1962 | 93,200 | Fair |
| I-26 over S.c 7/COSGROVE Ave | 1964 | 93,200 | Fair |
| I-26 over S-222/baker Hospital | 1964 | 90,000 | Fair |
| I-26 over S-1110 & RR NS | 1966 | 87,800 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of South Carolina: South Carolina bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.