S-21-720
Carrying S-21-720 over LANE BRANCH
1 MI E COWARD, Florence, South Carolina
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: S-21-720
The S-21-720 bridge in Florence, South Carolina carries S-21-720 over LANE BRANCH. It was built in 1965, making it 61 years old today. It was last reconstructed in 2003, extending its service life. The structure is built primarily of concrete and spans 3 sections, stretching 13.7 meters (45 feet) end to end. Daily traffic averages 175 vehicles, placing it in the lower-traffic 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. All reported major components score above the Poor range. Its NBI inventory load rating is 16.5 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How S-21-720 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 How the historical reference is calculated.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
- 1965
- Last Reconstructed
- 2003
- Material
- Concrete
- Number of Spans
- 3
- Structure Length
- 13.7 m (45 ft)
- Deck Width
- 8.6 m (28 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 175 vehicles/day
- Structure Number
- 000000000004535
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • At 6/9, the deck (driving surface) shows fair condition, with minor wear flagged for upkeep.
- • The superstructure (beams and supports above the deck) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • The substructure (piers and abutments) is in good condition (7/9), showing no significant deterioration.
How to read this record
This page shows what the last federal inspection recorded, not whether S-21-720 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 S-21-720 against other structures in Florence 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 S-21-720?
S-21-720 in Florence, 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 S-21-720 inspected?
S-21-720'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 175 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. S-21-720 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 S-21-720?
S-21-720 has an NBI inventory load rating of 16.5 metric tons.
Who is responsible for maintaining S-21-720?
S-21-720 is owned and maintained by State Highway Agency.
How old is S-21-720 and does age affect safety?
S-21-720 was built in 1965, making it 61 years old and last reconstructed in 2003.
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.