SC 171/FOLLY RD
Carrying SC 171/FOLLY RD over JAMES ISLAND CREEK
4 MI SW OF JAMES ISLAND, Charleston, South Carolina
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: SC 171/FOLLY RD
The SC 171/FOLLY RD bridge in Charleston, South Carolina carries SC 171/FOLLY RD over JAMES ISLAND CREEK. It was built in 2009, making it 17 years old today. The structure is built primarily of concrete and spans 7 sections, stretching 64.0 meters (210 feet) end to end. Daily traffic averages 48,400 vehicles, placing it in the heavily-trafficked tier of South Carolina bridges. It is owned and maintained by State Highway Agency.
The latest FHWA inspection records show a deck rating of 6/9, superstructure at 6/9, substructure at 7/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds. Its NBI inventory load rating is 47.3 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How SC 171/FOLLY RD compares
Live comparison across South Carolina.
Historical Sufficiency Rating
PlainBridge-computedFHWA discontinued this calculated item; it does not determine current condition, funding eligibility, posting, or closure. How the historical reference is calculated.
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Structural Details
- Year Built
- 2009
- Material
- Concrete
- Number of Spans
- 7
- Structure Length
- 64.0 m (210 ft)
- Deck Width
- 26.8 m (88 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 48,400 vehicles/day
- Structure Number
- 000000000002302
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • The superstructure (beams and supports above the deck) is in fair condition (6/9), with minor deterioration that may require routine maintenance.
- • The substructure (piers and abutments) rates good at 7/9, with no significant deterioration on file.
How to read this record
This page shows what the last federal inspection recorded, not whether SC 171/FOLLY RD is safe to cross today. Here is how to use it.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Learn how the 0–9 condition scale and Good/Fair/Poor categories are defined. How condition ratings work
- Compare SC 171/FOLLY RD against other structures in Charleston and across South Carolina. South Carolina bridges
- Noticed visible damage or a safety concern? Report it to the agency that owns the bridge, or call 911 in an emergency. How to report a bridge
Condition codes come straight from the FHWA National Bridge Inventory and are not a real-time safety judgment. Only the owning agency, a state DOT, county, or other owner, can post, restrict, or close a bridge.
Frequently Asked Questions
What do the condition ratings mean for SC 171/FOLLY RD?
SC 171/FOLLY RD in Charleston, South Carolina has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is SC 171/FOLLY RD inspected?
SC 171/FOLLY RD's responsible agency sets its routine interval under FHWA's risk-based inspection rules; this page does not expose the scheduled interval. It carries about 48,400 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. SC 171/FOLLY RD is currently shown as Fair condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for SC 171/FOLLY RD?
SC 171/FOLLY RD has an NBI inventory load rating of 47.3 metric tons.
Who is responsible for maintaining SC 171/FOLLY RD?
SC 171/FOLLY RD is owned and maintained by State Highway Agency.
How old is SC 171/FOLLY RD and does age affect safety?
SC 171/FOLLY RD was built in 2009, making it 17 years old.
Disclaimer: Bridge condition data is from the FHWA NBI and reflects the last reported inspection. A Poor condition rating is not a live declaration that a bridge is closed or unsafe for travel. For current closure, posting, or safety information, contact the responsible transportation agency.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.