NFA D813
Carrying NFA D813 over FRENCH BROAD RIVER
FEDERAL RD-W OF SR168, Knox, Tennessee
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: NFA D813
The NFA D813 bridge in Knox, Tennessee carries NFA D813 over FRENCH BROAD RIVER. It was built in 1965, making it 61 years old today. The structure is built primarily of prestressed concrete and spans 2 sections, stretching 42.7 meters (140 feet) end to end. Daily traffic averages 60 vehicles, placing it in the lower-traffic tier of Tennessee bridges. It is owned and maintained by County Highway Agency.
The latest FHWA inspection records show a deck rating of 7/9, superstructure at 5/9, substructure at 4/9. The weakest component sits in poor condition. A component scored 4 or below, placing this bridge in the federal Poor condition category rather than declaring it unsafe or closed. Its NBI inventory load rating is 32.4 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How NFA D813 compares
Live comparison across Tennessee.
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 How the historical reference is calculated.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
- Material
- Prestressed Concrete
- Number of Spans
- 2
- Structure Length
- 42.7 m (140 ft)
- Deck Width
- 11.2 m (37 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 60 vehicles/day
- Structure Number
- 470D8130001
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The deck (driving surface) is in good condition (7/9), showing no significant deterioration.
- • At 5/9, the superstructure (beams and supports above the deck) shows fair condition, with minor wear flagged for upkeep.
- • At 4/9, the substructure (piers and abutments) is in poor shape, with advanced wear flagged for priority repair.
How to read this record
NFA D813 is in the federal Poor condition category. That is a component-based result, not a closure order.
- NBI condition ratings reflect the latest record in this annual dataset, not a live status. Current routine inspection intervals are risk-based.
- Understand what Poor condition does and does not mean before drawing conclusions. Poor condition explained
- Compare NFA D813 against other structures in Knox and across Tennessee. Tennessee 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 NFA D813?
NFA D813 in Knox, Tennessee has a deck rating of 7/9, superstructure rating of 5/9, and substructure rating of 4/9 on the FHWA's 0–9 scale.
How often is NFA D813 inspected?
NFA D813'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 60 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. NFA D813 is currently shown as Poor condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for NFA D813?
NFA D813 has an NBI inventory load rating of 32.4 metric tons.
Who is responsible for maintaining NFA D813?
NFA D813 is owned and maintained by County Highway Agency.
How old is NFA D813 and does age affect safety?
NFA D813 was built in 1965, making it 61 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.