Nfa A121 over Knob Creek

Lauderdale County, Tennessee · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Nfa A121 over Knob Creek in Lauderdale County, Tennessee, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the substructure, rated 4 (poor condition) on the 0-9 scale.
• It was built in 1970, making it 55 years old at the 2025 inventory.
• It carries about 290 vehicles a day (traffic count year 2020).
• Its listed owner is the county highway agency.
• It is one of 16 of the 258 inventoried bridges in Lauderdale County rated poor (6.2%); 16 (6.2%) are rated poor.
• Its traffic status in the 2025 inventory is open, temporary structure in place to carry legal loads while the original structure is closed awaiting replacement or rehabilitation (NBI item 41).
• It does not appear under this structure number in the 2024 inventory (a new or renumbered structure).
• Its most recent inspection on record is dated November 2023, on a 24-month routine inspection cycle.
• A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

View this bridge on a map → (35.88036, -89.56983)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Tennessee department of transportation.

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Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.