Nfa 990 (sa 9425) over Harpeth River
PoorPosted for loadWilliamson County, Tennessee · 2.5 MI NW JCT SR 46&SR106 · Structure no. 94S63230005
- Built
- 1962
- 63 years old
- Condition
- Poor
- inspected July 2023
- Type
- Tee Beam
- Concrete
- Length
- 414 ft
- 13 main spans
- Daily traffic
- 11,007
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
Nfa 990 (sa 9425) over Harpeth River is a concrete tee beam carrying Nfa 990 (sa 9425) over Harpeth River in Williamson County, Tennessee. It was built in 1962, so it is 63 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: posted for load restriction.
It carries about 11,007 vehicles a day, roughly 3% of them trucks, projected to reach 17,611 by 2042. The structure is 414 ft (126.2 m) long and 29 ft wide. If it were closed, the detour would be 5 mi (8 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nfa 990 (sa 9425) over Harpeth River built?
It was built in 1962, making it 63 years old in 2025.
What condition is Nfa 990 (sa 9425) over Harpeth River 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 July 2023.
How much traffic does Nfa 990 (sa 9425) over Harpeth River carry?
About 11,007 vehicles per day (2021 count), of which roughly 3% are trucks.
How long is Nfa 990 (sa 9425) over Harpeth River?
The structure is 414 ft (126.2 m) long with a longest span of 43 ft (13.1 m) and a deck 29 ft wide.
Who owns Nfa 990 (sa 9425) over Harpeth River?
It is owned by the County Highway Agency.