NFA 1351 (SA 8604)
Carrying NFA 1351 (SA 8604) over NORTH INDIAN CREEK
IN UNICOI, Unicoi, Tennessee
Inventory: FHWA NBI 2024 · last ETL August 2026
FHWA NBI record, refreshed with each annual release.
NFA 1351 (SA 8604) in Unicoi, Tennessee sits above 23% of rated Tennessee bridges on inventory load rating (25 t), while its 1976 build year is earlier than 80% of Unicoi's recorded-year cohort (161 bridges).
NFA 1351 (SA 8604) in Unicoi, Tennessee is rated Fair in the FHWA's 2024 National Bridge Inventory. Built in 1976, 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 TN:86S24400007
INTERSTATE-ERA · PRESTRESS · MULTI-SPAN · SUPER-LED · ARTERIAL-ADT · STANDARD-LOAD · CAT-FAIR
- INTERSTATE-ERA 1950–1979
- PRESTRESS Prestressed concrete
- MULTI-SPAN 2 spans
- SUPER-LED Superstructure-led
- 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: NFA 1351 (SA 8604)
The NFA 1351 (SA 8604) bridge in Unicoi, Tennessee carries NFA 1351 (SA 8604) over NORTH INDIAN CREEK. It was built in 1976, making it 50 years old today. The structure is built primarily of prestressed concrete continuous and spans 2 sections, stretching 33.0 meters (108 feet) end to end. Daily traffic averages 1,607 vehicles, placing it in the moderately-trafficked 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 6/9, substructure at 7/9. The weakest component sits in fair condition. None of this bridge's reported major components fall into the Poor condition range.
How NFA 1351 (SA 8604) compares
Age against the county: built in 1976, earlier than 128 of Unicoi's 161 bridges with a recorded construction year (80%), against a county median build year of 1985. 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 1351 (SA 8604) vs every rated Tennessee bridge
Inventory load rating (metric tons), FHWA NBI, this state
25 Top 77% higher than 23% 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.
Unicoi inventory by recorded NBI category
Exclusive Good/Fair/Poor bands across all 161 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
- 1976
- Material
- Prestressed Concrete Continuous
- Number of Spans
- 2
- Structure Length
- 33.0 m (108 ft)
- Deck Width
- 11.0 m (36 ft)
- Owner
- County Highway Agency
- Avg Daily Traffic
- 1,607 vehicles/day
- Structure Number
- 86S24400007
Condition Analysis
- • At 7/9, the deck (driving surface) is in good shape and shows no significant wear.
- • 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 good at 7/9, with no significant deterioration on file.
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 NFA 1351 (SA 8604) 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 NFA 1351 (SA 8604) against other structures in Unicoi 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 1351 (SA 8604)?
NFA 1351 (SA 8604) in Unicoi, Tennessee has a deck rating of 7/9, superstructure rating of 6/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is NFA 1351 (SA 8604) inspected?
NFA 1351 (SA 8604)'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 1,607 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. NFA 1351 (SA 8604) 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 NFA 1351 (SA 8604)?
NFA 1351 (SA 8604) has an NBI inventory load rating of 24.6 metric tons.
Who is responsible for maintaining NFA 1351 (SA 8604)?
NFA 1351 (SA 8604) is owned and maintained by County Highway Agency.
How old is NFA 1351 (SA 8604) and does age affect safety?
NFA 1351 (SA 8604) was built in 1976, making it 50 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.