US 340 Wbr over S Mountain Road
FairFrederick County, Maryland · 0.27 Mile East of Md 180 · Structure no. 100000100113014
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 103 ft
- 3 main spans
- Daily traffic
- 23,492
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
US 340 Wbr over S Mountain Road is a steel stringer/multi-beam or girder carrying US 340 Wbr over S Mountain Road in Frederick County, Maryland. It was built in 1964, so it is 61 years old, older than the Maryland average of 52.6 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 23,492 vehicles a day, roughly 8% of them trucks, projected to reach 13,958 by 2026. The structure is 103 ft (31.4 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 340 Wbr over S Mountain Road built?
It was built in 1964, making it 61 years old in 2025.
What condition is US 340 Wbr over S Mountain Road 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 April 2024.
How much traffic does US 340 Wbr over S Mountain Road carry?
About 23,492 vehicles per day (2009 count), of which roughly 8% are trucks.
How long is US 340 Wbr over S Mountain Road?
The structure is 103 ft (31.4 m) long with a longest span of 36 ft (11 m) and a deck 42 ft wide.
Who owns US 340 Wbr over S Mountain Road?
It is owned by the State Highway Agency.