TN ROUTE 20
Carrying TN ROUTE 20 over NATCHEZ TRACE PARKWAY
5.6 MILES TO U.S. ROUTE 4, Lewis, Tennessee
Data updated May 2026
FHWA NBI record, refreshed with each annual release.
Bridge Snapshot: TN ROUTE 20
The TN ROUTE 20 bridge in Lewis, Tennessee carries TN ROUTE 20 over NATCHEZ TRACE PARKWAY. It was built in 1960, making it 66 years old today. The structure is built primarily of concrete and spans 1 section, stretching 22.7 meters (74 feet) end to end. Daily traffic averages 485 vehicles, placing it in the lower-traffic tier of Tennessee bridges. It is owned and maintained by National Park Service.
The latest FHWA inspection records show superstructure at 7/9, substructure at 7/9. The weakest component sits in good condition. All reported major components score above the Poor range. Its NBI inventory load rating is 31.7 metric tons.
Sourced from the FHWA National Bridge Inventory. See our methodology for refresh cadence and NBI release vintage.
How TN ROUTE 20 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 How the historical reference is calculated.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
- 1960
- Material
- Concrete
- Number of Spans
- 1
- Structure Length
- 22.7 m (74 ft)
- Deck Width
- 10.4 m (34 ft)
- Owner
- National Park Service
- Avg Daily Traffic
- 485 vehicles/day
- Structure Number
- 5570188P0000000
Location
Data Source
FHWA National Bridge Inventory (NBI).
FHWA NBI Program ↗Condition Analysis
- • The superstructure (beams and supports above the deck) rates good at 7/9, with no significant deterioration on file.
- • The substructure (piers and abutments) is in good condition (7/9), showing no significant deterioration.
How to read this record
This page shows what the last federal inspection recorded, not whether TN ROUTE 20 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 TN ROUTE 20 against other structures in Lewis 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 TN ROUTE 20?
TN ROUTE 20 in Lewis, Tennessee, superstructure rating of 7/9, and substructure rating of 7/9 on the FHWA's 0–9 scale.
How often is TN ROUTE 20 inspected?
TN ROUTE 20'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 485 vehicles per day.
What does “structurally deficient” mean in older bridge reports?
FHWA retired that reported status beginning with the 2018 archive. TN ROUTE 20 is currently shown as Good condition from its component ratings; that category is not a live closure or safety decision.
What is the inventory load rating for TN ROUTE 20?
TN ROUTE 20 has an NBI inventory load rating of 31.7 metric tons.
Who is responsible for maintaining TN ROUTE 20?
TN ROUTE 20 is owned and maintained by National Park Service.
How old is TN ROUTE 20 and does age affect safety?
TN ROUTE 20 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.
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.