SC 171/FOLLY RD
Carrying SC 171/FOLLY RD over LONG ISLAND RIVER
1 1/2 MI N OF FOLLY BEACH, Charleston, South Carolina
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
SC 171/FOLLY RD in Charleston, South Carolina sits above 71% of rated South Carolina bridges on inventory load rating (38 t), while its 2016 build year is earlier than 6% of Charleston's recorded-year cohort (336 bridges).
SC 171/FOLLY RD in Charleston, South Carolina is rated Good in the FHWA's 2024 National Bridge Inventory. Built in 2016, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 7. The lowest applicable rating sets the federal condition category, so this Good result describes the weakest reported component rather than the structure as a whole. No NBI category is a closure decision or a live crossing-safety verdict.
NBI record plate
Structure SC:000000000002301
POST-2000 · PRESTRESS · LONG-SPAN-RUN · TIED-CTRL · HEAVY-ADT · STANDARD-LOAD · CAT-GOOD
- POST-2000 2000+
- PRESTRESS Prestressed concrete
- LONG-SPAN-RUN 11 spans
- TIED-CTRL Tied control
- HEAVY-ADT Heavy ADT
- STANDARD-LOAD Standard load
- CAT-GOOD Good
Inspection-sheet codes from this record’s year, material family, spans, controlling component, ADT, inventory load, and NBI category, not a live closure verdict.
Bridge Snapshot: SC 171/FOLLY RD
The SC 171/FOLLY RD bridge in Charleston, South Carolina carries SC 171/FOLLY RD over LONG ISLAND RIVER. It was built in 2016, making it 10 years old today. The structure is built primarily of prestressed concrete continuous and spans 11 sections, stretching 251.5 meters (825 feet) end to end. Daily traffic averages 17,600 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 7/9, superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. None of this bridge's reported major components fall into the Poor condition range.
How SC 171/FOLLY RD compares
Age against the county: built in 2016, earlier than 21 of Charleston's 336 bridges with a recorded construction year (6%), against a county median build year of 1991. This is one of the newer structures in its county.
Live comparison across South Carolina bridges with a recorded inventory load rating (9,483 of 9,490 rated).
SC 171/FOLLY RD vs every rated South Carolina bridge
Inventory load rating (metric tons), FHWA NBI, this state
38 Top 29% higher than 71% of 9,483 bridges
rated South Carolina bridges, bucketed by value
Each bar is a band; taller bars hold more bridges. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source FHWA National Bridge Inventory · August 2026
Condition Ratings
Full 0–9 scale + sufficiency-rating breakdown: how condition ratings work.
Reported 0–9 component ratings from the FHWA NBI. The highlighted component is the lowest reported input to this record’s current condition category; it is not a closure or live crossing-safety decision.
Charleston inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 336 bridges in this county. Orthogonal to this structure's component profile above: a county catalog share, not a live crossing-safety verdict.
Structural Details
- Year Built
- 2016
- Material
- Prestressed Concrete Continuous
- Number of Spans
- 11
- Structure Length
- 251.5 m (825 ft)
- Deck Width
- 14.9 m (49 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 17,600 vehicles/day
- Structure Number
- 000000000002301
Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • At 7/9, the superstructure (beams and supports above the deck) is in good shape and shows no significant wear.
- • The substructure (piers and abutments) is in good condition (7/9), showing no significant deterioration.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗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 7/9, superstructure rating of 7/9, 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 17,600 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 Good 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 37.6 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 2016, making it 10 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.
Share this inspection record
Send this source-bounded record or download its data card. An NBI condition category is not a closure or live crossing-safety verdict.
Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. Component ratings, ADT, and condition category on this page are copied from the NBI record for this structure; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.