US 521
Carrying US 521 over BIG PINE TREE CREEK
1MI S OF CAMDEN, Kershaw, South Carolina
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: US 521
The US 521 bridge in Kershaw, South Carolina carries US 521 over BIG PINE TREE CREEK. It was built in 1930, making it 96 years old today. It was last reconstructed in 1973, extending its service life. The structure is built primarily of concrete and spans 2 sections, stretching 8.8 meters (29 feet) end to end. Daily traffic averages 15,700 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 culvert at 6/9. The weakest component sits in fair condition. All reported major components score above the Poor range. Its NBI inventory load rating is 24.6 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How US 521 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 How the historical reference is calculated.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
- 1930
- Last Reconstructed
- 1973
- Material
- Concrete
- Number of Spans
- 2
- Structure Length
- 8.8 m (29 ft)
- Deck Width
- 40.2 m (132 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 15,700 vehicles/day
- Structure Number
- 000000000000424
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 US 521 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 US 521 against other structures in Kershaw 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 US 521?
US 521 in Kershaw, South Carolina on the FHWA's 0–9 scale.
How often is US 521 inspected?
US 521'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 15,700 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. US 521 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 US 521?
US 521 has an NBI inventory load rating of 24.6 metric tons.
Who is responsible for maintaining US 521?
US 521 is owned and maintained by State Highway Agency.
How old is US 521 and does age affect safety?
US 521 was built in 1930, making it 96 years old and last reconstructed in 1973.
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.