KY-321
Carrying KY-321 over KY-1428
KY 1428 JCT @ W VAN LEAR, Johnson, Kentucky
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
KY-321 in Johnson, Kentucky sits above 37% of rated Kentucky bridges on inventory load rating (35 t), while its 1960 build year is earlier than 78% of Johnson's recorded-year cohort (99 bridges).
KY-321 in Johnson, Kentucky is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1960, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 6. The lowest applicable rating sets the federal condition category, so this Fair 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 KY:058B00040N
INTERSTATE-ERA · CONCRETE · LONG-SPAN-RUN · TIED-CTRL · ARTERIAL-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- CONCRETE Concrete
- LONG-SPAN-RUN 4 spans
- TIED-CTRL Tied control
- ARTERIAL-ADT Arterial ADT
- STANDARD-LOAD Standard load
- CAT-FAIR Fair
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: KY-321
The KY-321 bridge in Johnson, Kentucky carries KY-321 over KY-1428. It was built in 1960, making it 66 years old today. The structure is built primarily of concrete continuous and spans 4 sections, stretching 83.5 meters (274 feet) end to end. Daily traffic averages 5,797 vehicles, placing it in the moderately-trafficked tier of Kentucky 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 6/9. The weakest component sits in fair condition. No reported major component scores in the Poor range under the current federal condition thresholds.
How KY-321 compares
Age against the county: built in 1960, earlier than 77 of Johnson's 99 bridges with a recorded construction year (78%), against a county median build year of 1991. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Kentucky bridges with a recorded inventory load rating (14,532 of 14,548 rated).
KY-321 vs every rated Kentucky bridge
Inventory load rating (metric tons), FHWA NBI, this state
35 Top 63% higher than 37% of 14,532 bridges
rated Kentucky 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.
Johnson inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 99 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
- 1960
- Material
- Concrete Continuous
- Number of Spans
- 4
- Structure Length
- 83.5 m (274 ft)
- Deck Width
- 11.5 m (38 ft)
- Owner
- State Highway Agency
- Avg Daily Traffic
- 5,797 vehicles/day
- Structure Number
- 058B00040N
Condition Analysis
- • The deck (driving surface) rates fair at 6/9, minor deterioration that routine maintenance should address.
- • 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) rates fair at 6/9, minor deterioration that routine maintenance should address.
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 KY-321 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 KY-321 against other structures in Johnson and across Kentucky. Kentucky 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 KY-321?
KY-321 in Johnson, Kentucky has a deck rating of 6/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is KY-321 inspected?
KY-321'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 5,797 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. KY-321 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 KY-321?
KY-321 has an NBI inventory load rating of 35.1 metric tons.
Who is responsible for maintaining KY-321?
KY-321 is owned and maintained by State Highway Agency.
How old is KY-321 and does age affect safety?
KY-321 was built in 1960, making it 66 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.