I 840 over I 840 /Csx Rr&harpeth
FairWilliamson County, Tennessee · 2.1 MI W JCT.SR11&I840 · Structure no. 94SR8400077
- Built
- 2001
- 24 years old
- Condition
- Fair
- inspected March 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 680 ft
- 6 main spans
- Daily traffic
- 39,020
- 2021 count
- Owner
- State
- State Highway Agency
About this bridge
I 840 over I 840 /Csx Rr&harpeth is a prestressed concrete continuous stringer/multi-beam or girder carrying I 840 over I 840 /Csx Rr&harpeth in Williamson County, Tennessee. It was built in 2001, so it is 24 years old, younger than the Tennessee average of 47.4 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 39,020 vehicles a day, roughly 7% of them trucks, projected to reach 57,094 by 2041. The structure is 680 ft (207.3 m) long and 44 ft wide. If it were closed, the detour would be 8.1 mi (13 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 840 over I 840 /Csx Rr&harpeth built?
It was built in 2001, making it 24 years old in 2025.
What condition is I 840 over I 840 /Csx Rr&harpeth in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.
How much traffic does I 840 over I 840 /Csx Rr&harpeth carry?
About 39,020 vehicles per day (2021 count), of which roughly 7% are trucks.
How long is I 840 over I 840 /Csx Rr&harpeth?
The structure is 680 ft (207.3 m) long with a longest span of 122 ft (37.2 m) and a deck 44 ft wide.
Who owns I 840 over I 840 /Csx Rr&harpeth?
It is owned by the State Highway Agency.