Nfa B678 over Knob Creek
GoodWashington County, Tennessee · E of US11E N of SR36 JCT · Structure no. 900B6780001
- Built
- 1989
- 36 years old
- Condition
- Good
- inspected June 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 36 ft
- 2 main spans
- Daily traffic
- 360
- 2020 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Nfa B678 over Knob Creek is a concrete continuous culvert carrying Nfa B678 over Knob Creek in Washington County, Tennessee. It was built in 1989, so it is 36 years old, younger than the Tennessee average of 47.4 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 360 vehicles a day, roughly 2% of them trucks, projected to reach 576 by 2042. The structure is 36 ft (10.9 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nfa B678 over Knob Creek built?
It was built in 1989, making it 36 years old in 2025.
What condition is Nfa B678 over Knob Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.
How much traffic does Nfa B678 over Knob Creek carry?
About 360 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is Nfa B678 over Knob Creek?
The structure is 36 ft (10.9 m) long with a longest span of 16 ft (4.9 m) and a deck 32 ft wide.
Who owns Nfa B678 over Knob Creek?
It is owned by the City or Municipal Highway Agency.