US 340 over Potomac River & CSX Rwy
FairLoudoun County, Virginia · 00.34FR671VA/00.30TO180MD · Structure no. 000000000011145
- Built
- 1946
- 79 years old, rebuilt 1978
- Condition
- Fair
- inspected December 2023
- Type
- Truss - Deck
- Steel Continuous
- Length
- 2,251 ft
- 12 main spans
- Daily traffic
- 25,063
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US 340 over Potomac River & CSX Rwy is a steel continuous truss - deck carrying US 340 over Potomac River & CSX Rwy in Loudoun County, Virginia. It was built in 1946 and reconstructed in 1978, so it is 79 years old, older than the Virginia average of 50.7 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 25,063 vehicles a day, roughly 1% of them trucks, projected to reach 34,606 by 2042. The structure is 2,251 ft (686.1 m) long and 37 ft wide. If it were closed, the detour would be 19.3 mi (31 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 | 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 340 over Potomac River & CSX Rwy built?
It was built in 1946, making it 79 years old in 2025. It was reconstructed in 1978.
What condition is US 340 over Potomac River & CSX Rwy 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 December 2023.
How much traffic does US 340 over Potomac River & CSX Rwy carry?
About 25,063 vehicles per day (2022 count), of which roughly 1% are trucks.
How long is US 340 over Potomac River & CSX Rwy?
The structure is 2,251 ft (686.1 m) long with a longest span of 190 ft (57.9 m) and a deck 37 ft wide.
Who owns US 340 over Potomac River & CSX Rwy?
It is owned by the State Highway Agency.