South Carolina Bridge Infrastructure: A Complete Analysis

South Carolina is home to 9,504 bridges spanning 46 counties, making it one of the most significant bridge inventories in the country. These bridges carry a combined 56,358,824 vehicle crossings every day. Here is a comprehensive look at the state of South Carolina's bridge infrastructure based on the latest National Bridge Inventory data.

South Carolina earns an overall infrastructure grade of C based on the percentage of its bridges in poor condition. Currently, 602 bridges (6.3%) are rated poor, compared to the national average of 6.7%. The average bridge in South Carolina is 49 years old, older than the national average of 48 years.

Of the state's 9,504 bridges, 3,568 are in good condition, 5,334 are fair, and 602 are poor. View the full breakdown on the [South Carolina report card](/reports/south-carolina).

These are the bridges carrying the highest daily traffic volumes across South Carolina. High-traffic bridges are critical infrastructure -- their condition directly affects the commutes of tens of thousands of drivers.

The following bridges have the lowest sufficiency ratings in South Carolina. These structures are the most likely candidates for federal repair or replacement funding under the Bipartisan Infrastructure Law.

South Carolina's oldest bridges tell the story of the state's transportation history. Some of these structures have been in continuous service for over a century.

South Carolina's bridge infrastructure grade of C reflects both the current condition of the state's bridges and the scale of the challenge ahead. With an average bridge age of 49 years, many of these structures are approaching or past the 50-75 year design life typical of most bridges. The state's ability to maintain and replace aging bridges will determine whether conditions improve or deteriorate in the coming decade.

For county-by-county breakdowns, historical trends, and individual bridge profiles, visit the [South Carolina state page](/bridges/south-carolina) or the [South Carolina report card](/reports/south-carolina). You can also explore how South Carolina compares to other states in our [state rankings](/blog/best-bridge-infrastructure-by-state-2025).