Nfa A121 over Knob Creek
PoorLauderdale County, Tennessee · 3.8 MI E of SR88 · Structure no. 490A1210003
- Built
- 1970
- 55 years old
- Condition
- Poor
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 41 ft
- 2 main spans
- Daily traffic
- 290
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Nfa A121 over Knob Creek is a steel continuous stringer/multi-beam or girder carrying Nfa A121 over Knob Creek in Lauderdale County, Tennessee. It was built in 1970, so it is 55 years old, older than the Tennessee average of 47.4 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, temporary structure in place while original is closed.
It carries about 290 vehicles a day, roughly 2% of them trucks, projected to reach 464 by 2042. The structure is 41 ft (12.5 m) long and 27 ft wide. If it were closed, the detour would be 13 mi (21 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nfa A121 over Knob Creek built?
It was built in 1970, making it 55 years old in 2025.
What condition is Nfa A121 over Knob Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2023.
How much traffic does Nfa A121 over Knob Creek carry?
About 290 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is Nfa A121 over Knob Creek?
The structure is 41 ft (12.5 m) long with a longest span of 21 ft (6.4 m) and a deck 27 ft wide.
Who owns Nfa A121 over Knob Creek?
It is owned by the County Highway Agency.