NFA A317 347891F
Carrying NFA A317 347891F over CSX RAILROAD
3.4 MI SW JCT SR30&SR33, Polk, Tennessee
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
NFA A317 347891F in Polk, Tennessee sits above 1% of rated Tennessee bridges on inventory load rating (2 t), while its 1913 build year is earlier than 99% of Polk's recorded-year cohort (140 bridges).
NFA A317 347891F in Polk, Tennessee is rated Poor in the FHWA's 2024 National Bridge Inventory. Built in 1913, it carries 3 rated components on the inspecting agency's 0-9 scale, and its weakest reported component scores 4. The lowest applicable rating sets the federal condition category, so this Poor 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 TN:700A3170003
PRE-1950 · TIMBER · LONG-SPAN-RUN · DECK-LED · TRACE-ADT · LIGHT-LOAD · CAT-POOR
- PRE-1950 Pre-1950
- TIMBER Wood or timber
- LONG-SPAN-RUN 6 spans
- DECK-LED Deck-led
- TRACE-ADT Trace ADT
- LIGHT-LOAD Light load
- CAT-POOR Poor
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: NFA A317 347891F
The NFA A317 347891F bridge in Polk, Tennessee carries NFA A317 347891F over CSX RAILROAD. It was built in 1913, making it 113 years old today. It was last reconstructed in 1988, extending its service life. The structure is built primarily of wood or timber and spans 6 sections, stretching 36.0 meters (118 feet) end to end. Daily traffic averages 40 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 4/9, superstructure at 6/9, substructure at 6/9. The weakest component sits in poor condition. At least one major component here scores 4 or below, which produces a Poor condition classification under FHWA's current reporting rules.
How NFA A317 347891F compares
Age against the county: built in 1913, earlier than 139 of Polk's 140 bridges with a recorded construction year (99%), against a county median build year of 1984. Age is not a defect on its own, but it is the population from which future Poor ratings are drawn.
Live comparison across Tennessee bridges with a recorded inventory load rating (20,355 of 20,379 rated).
NFA A317 347891F vs every rated Tennessee bridge
Inventory load rating (metric tons), FHWA NBI, this state
2 Top 99% higher than 1% of 20,355 bridges
rated Tennessee 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.
Polk inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 140 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
- 1913
- Last Reconstructed
- 1988
- Material
- Wood or Timber
- Number of Spans
- 6
- Structure Length
- 36.0 m (118 ft)
- Deck Width
- 5.2 m (17 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 40 vehicles/day
- Structure Number
- 700A3170003
Condition Analysis
- • The deck (driving surface) rates poor at 4/9, with advanced deterioration recorded on the latest inspection.
- • 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 fair condition (6/9), with minor deterioration that may require routine maintenance.
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗How to read this record
NFA A317 347891F 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 A317 347891F against other structures in Polk 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 A317 347891F?
NFA A317 347891F in Polk, Tennessee has a deck rating of 4/9, superstructure rating of 6/9, and substructure rating of 6/9 on the FHWA's 0–9 scale.
How often is NFA A317 347891F inspected?
NFA A317 347891F'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 40 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. NFA A317 347891F 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 A317 347891F?
NFA A317 347891F has an NBI inventory load rating of 1.6 metric tons.
Who is responsible for maintaining NFA A317 347891F?
NFA A317 347891F is owned and maintained by County Highway Agency.
How old is NFA A317 347891F and does age affect safety?
NFA A317 347891F was built in 1913, making it 113 years old and last reconstructed in 1988.
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.